摘要:

iv Online access to the world’s An a I y t i ca I Abstracts ONLINE I I Analytical Abstracts Online ... is the online equivalent of hard copy Analytical Abstracts, the western world’s most comprehensive abstracting journal dealing solely with analytical chemistry in all its aspects, Analytical Abstracts Online ... contains bibliographic information on general, inorganic, organic, biochemical, pharmaceutical, food, agricultural and environmental aspects of analytical chemistry, including computer and instrumentational applications in analysis. Analytical Abstracts Online m m . offers: 0 Comprehensive coverage of analytical chemistry 0 Coverage 1980-to date : over 70,000 items 0 Analytical methods in high detail 0 Quality controlled language indexes 0 Easy access via DATA-STAR, (Plaza Suite, 114 Jermyn Street, London SW1Y 6HJ); and PERGAMON INFOLINE Ltd., (1 2 Vandy Street, London EC2A 2DE).For further information contact your chosen host direct or write to:- The Royal Society of Chemistry, The University, Nottingham, NG7 2RD. Tel. 0602 50741 1 Telex: 37488 ROYAL lnformat ion Servicesiv Online access to the world’s An a I y t i ca I Abstracts ONLINE I I Analytical Abstracts Online ... is the online equivalent of hard copy Analytical Abstracts, the western world’s most comprehensive abstracting journal dealing solely with analytical chemistry in all its aspects, Analytical Abstracts Online ... contains bibliographic information on general, inorganic, organic, biochemical, pharmaceutical, food, agricultural and environmental aspects of analytical chemistry, including computer and instrumentational applications in analysis. Analytical Abstracts Online m m . offers: 0 Comprehensive coverage of analytical chemistry 0 Coverage 1980-to date : over 70,000 items 0 Analytical methods in high detail 0 Quality controlled language indexes 0 Easy access via DATA-STAR, (Plaza Suite, 114 Jermyn Street, London SW1Y 6HJ); and PERGAMON INFOLINE Ltd., (1 2 Vandy Street, London EC2A 2DE). For further information contact your chosen host direct or write to:- The Royal Society of Chemistry, The University, Nottingham, NG7 2RD. Tel. 0602 50741 1 Telex: 37488 ROYAL lnformat ion Services

ISSN:0267-9477    

DOI:10.1039/JA98601FX001

出版商:RSC    

年代:1986

数据来源: RSC

摘要:

2 JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL. 1 Editorials The Birth of JAAS! As indicated by Professor West in his Foreword, the publication of a new inter- national journal by the Royal Society of Chemistry is an unusual and consequently extremely exciting event. To those of us closely concerned with the conception and the planning and design of JAAS, the past year has been a hectic one. We naturally hope you like the result, and that you will find in the course of time that JAAS has become both indispensable and a good read. The decision to go ahead with the introduction of a new journal in the field of analytical atomic spectrometry aimed principally at the user of modern instrumentation was taken only after a carefully conducted and thorough market survey.We are pleased to say that the positive response to this has been rein- forced by many messages of support and encouragement from all over the world received since the release of our earlier publicity. Current submissions of papers are higher than we anticipated at this stage, and the over-all quality suggests that our colleagues already feel that JAAS will represent an attractive vehicle for the wide dissemination of new ideas and concepts in this subject. We are particul- arly grateful to those authors with suffi- cient confidence in both JAAS and the RSC to submit papers before having the opportunity to see a copy of the journal. We hope they are not disappointed! It is interesting that the principal tech- niques of atomic spectrometry have apparently reached substantial maturity.The slow pace of the commercial develop- ment of new ideas always seems to make the subject static. Who would have thought in 1960, however, that atomic absorption and inductively coupled plasma emission spectrometry would occupy their present positions in the field of trace element analysis? An objective of JAAS is to bridge the gaps between the researcher, the manufacturer and the user, to help to reduce the long delay time between the conception of an idea and its wider or general utilisation. This applies equally to major instrumental develop- ments such as ICP-MS, laser based instru- ment systems or continuum source AAS, as to novel but more minor technical advances such as new hydride generation configurations, the slotted tube atom trap or indeed to the use of platforms in elec- trothermal atomisation.Often a manu- facturer will work hard to produce and present a new instrument system or dev- ice, but articles from users are very slow to appear in the literature. We hope that users of modern instrumentation will find JAAS an important vehicle for describing applications of and modifications to new systems, as we anticipate that other users as well as the manufacturers will find such papers valuable. The organisation of JAAS is set out on the preceding pages. We are delighted to have received the enthusiastic support of a wide range of atomic spectroscopists who have either agreed to join the Advi- sory Board or are continuing to collabor- ate over the production of Updates. We believe that the efficient production of a journal requires the attention of full- time staff.The Editor, Judith Brew, is already known to many spectroscopists, but we hope that many others will meet her and other members of the Board at analytical and spectroscopic conferences in 1986. Papers from North America should be submitted through our US Associate Editor, Jim Harnly, who will operate a rapid local review procedure prior to normal editing in London. This issue illustrates the desired inclusion of papers of all types and length (full papers, short papers and communications), an informative news section, together with our first Update and bibliography. To those of us who have been involved in the production of Annual Reports on Analy- tical Atomic Spectroscopy (ARAAS), the incorporation of reviews or Updates in JAAS is both exciting and rewarding.ARAAS was always well received but often too late. In its new guise, publica- tion of the ARAAS reviews will be rapid and immediately more comprehensive and available to the user. The complete compilation of papers from journals and conferences will also provide a unique information dissemination mechanism. Although the Editorial Board has wor- ked hard to ensure an attractive and valuable new journal, we realise that we are unlikely to have got everything right first time. The first issue will be distri- buted widely and we would genuinely welcome constructive comments from readers. We would also welcome informa- tion on a world-wide basis on future conferences, meetings, etc.for the news section of the journal. Many people have already contributed much time and effort to the production of the journal. I would particulary like to thank Professor Tom West who has taken time off from his duties at the Macaulay Institute for Soil Research and as Secretary General of IUPAC to produce a stimulating Fore- word for this issue. Our thanks must also go to the staff of the Journals Department of the RSC for their patience and their creative contributions over the past year, and also to the officers of the Analytical Division who enthusiastically supported the introduction of a new RSC analytical journal from the outset. We have been particularly heartened by the enthusiastic and active support of many scientific colleagues. Eighteen months ago we felt that there was a niche in the scientific literature for a journal like JAAS, and nothing has happened since to change this view.We hope it will make a significant and lasting contribution to our science. J. M. Ottaway Chairman, JAAS Editorial Board A New Journal to Complement The Analyst A measure of the success and interest of a new scientific activity is that it can sustain a primary journal for the dissemination of fresh developments. Hitherto, such jour- nals covered a full scientific discipline, and later on just divisions of disciplines. More recently, just single subject areas have had primary journals dedicated to them. Having regard to the considerable developments and widespread interest in atomic spectrometry over the last 25 years or so, it is perhaps surprising that there has not been a primary journal devoted to applications of this still developing area within the larger field of spectroscopy. This is no longer the case for the day has arrived and the first issue of the Journal of Analytical Atomic Spectrometry is pub- lished by The Royal Society of Chemistry under the aegis of its Analytical Editorial Board and with its own editorial structure of staff Editor, Editorial Board and Advisory Board. The Analytical Editorial Board, which also has responsibility for The Analyst and Analytical Proceedings, extend their very best wishes to all who have been con- cerned with this launch and commend the Journal of Analytical Atomic Spec- trometry to all who are engaged and are interested in the field, wherever they may be. J. D. R. Thomas Chairman, Analytical Editorial Board

ISSN:0267-9477    

DOI:10.1039/JA9860100002

出版商:RSC    

年代:1986

数据来源: RSC

摘要:

JASPE2 1 (1 ) I-96,l R-28R (1986) February 1986 Journal of Analytical Atomic Spectrometry Including Atomic Spectrometry Updates CONTENTS NEWS AND VIEWS 1 2 3 5 6 6 7 8 8 Foreword-T. S. West Editorials-J. M. Ottaway and J. D. R. Thomas Atomic Spectrometry Viewpoint-G. M. Hieftje Conference Reports Historical Corner-Allan M. Ure ASU Highlights-M. S. Cresser Conferences and Meetings Courses Papers in Future Issues PAPERS 9 19 23 29 35 41 45 51 55 59 63 75 79 85 89 93 Volatilisation Studies of Cadmium Compounds by the Combined Quartz Furnace and Flame Atomic Absorption Method: Effects of Magnesium Chloride and Ascorbic Acid Additives-Ti bor Kantor, Laszlo Bezur Determination of Cadmium in Calcium Chloride Extracts of Soils by Atom-trapping Atomic Absorption Spectrometry-Sheila M.Fraser, Allan M. Ure, Margaret C. Mitchell, Thomas S. West Mechanisms of Transition Metal Interferences in Hydride Generation Atomic Absorption Spectrometry. Part 4. Influence of Acid and Tetrahydroborate Concentrations of Interferences in Arsenic and Selenium Determinations-Bern hard Welz, Ma ria n ne Sch u bert-J aco bs Low-resolution Monochromator System for Electrothermal Atomisation Atomic Emission Spectrometry with Probe Atomisation-Douglas C. Baxter, lain S. Duncan, David Littlejohn, John Marshall, John M. Ottaway, Gordon S. Fell, 0. Yavuz Ataman Determination of Chromium in Urine by Probe Electrothermal Atomisation Atomic Emission Spectrometry Using a Low-resolution Monochromator-Douglas C. Baxter, David Littlejohn, John M. Ottaway, Gordon S. Fell, David J.Halls Determination of Aluminium in Soil Extracts by Carbon Arc Emission Spectrometry after Coprecipitation with Iron Using 8-Hydroxyquinoline-John C. Burridge, Irene J. Hewitt Direct Current Plasma as an Excitation Source for Flame Atomic Fluorescence Spectrometry-Some Applications-Martha S. Hendrick, Philip A. Goliber, Robert G. Michel Evaluation of a Continuously Variable Impactor for Use with Flame Atomisation-Clare E. O'Grady, lain L. Marr, Malcolm S. Cresser Improvement of a Pneumatic Nebuliser for Atomic Absorption Spectrometry-Barry T. Sturman A Comparison of Cloud Chambers for Use in Inductively Coupled Plasma Nebulisation Systems-Leslie S. Dale, Stephen J. Buchanan Flow Injection Atomic Absorption Spectrometry: The Kinetics of Instrument Response-John M.H. Appleton, Julian F. Tyson Signal t o Noise Ratios for Flow Injection Atomic Absorption Spectrometry-James M. Harnly, Gary R. Beecher Determination of Sodium, Potassium, Calcium, Magnesium, Iron, Copper and Zinc in Cerebrospinal Fluid by Flow Injection Atomic Absorption Spectrometry-J. L. Burguera, M. Burguera, 0. M. Alarcon SHORT PAPER A Comparison of Curve Fitting Algorithms for Flame Atomic Absorption Spectrometry-Stephen R. Bysouth, Julian F. Tyson COMMU NlCATlON Calibration in Continuum-source Atomic Absorption by Curve Fitting the Trans- mission Profile-John Kindervater, Thomas C. O'Haver INSTRUCTIONS TO AUTHORS ___________ ATOMIC SPECTROMETRY UPDATE 1R Environmental Analysis-Malcolm S. Cresser, Les C. Ebdon, Cameron W. McLeod, John C. Burridge 19R References Electronically typeset and printed by Heffers Printers Ltd, Cambridge, EnglandSAC 8 6 / 3 ~ ~ BNASS AN INTERNATIONAL CONFERENCE ON ANALYTICAL CHEMISTRY AND ATOMIC SPECTROSCOPY UNIVERSITY OF BRISTOL, 20-26 JULY, 1986 Organised by the Analytical Division, Royal Society of Chemistry, in conjunction with The Spectroscopy Group of The Institute of Physics FEATURES Plenary, invited and contributed lectures and posters.Special symposia on particular themes organised by RSC Groups and associated bodies. Workshops for the demonstration of new apparatus and techniques. One-day update courses (Wednesday), visits and social programme. LECTURERS Plenary: J. H. Knox (UK) ‘%Advances in Columns and Packings for HPLC” M. Bonner Denton (USA) “Concepts for Improved Automated Laboratory B.V. L’vov (USSR) “New Advances in Furnace Atomic Absorption Spectrometry” G. Tolg (FRG) “Extreme Trace Analysis of the Elements-The State of the Art Productivity” Today and Tomorrow” Invited: J. F. Alder (UK), M. S. Cresser (UK), A. R. Date (UK), L. de Galan (NETH), J. Goldsmith (UK), J. G. Grasselli (USA), D. A. Hickman (UK), W. Horwitz (USA), R. D. Snook (UK), V. Sychra (CZECH), A. Thorne (UK), A. Townshend (UK), G. Werner (GDR), T. S. West (UK) STRUCTURE Parallel lecture streams will be held on the Monday, Tuesday, Thursday and Friday on SAC themes. The BNASS Atomic Spectrometry streams will be held on the Wednesday, Thursday and Friday. Update courses will be held on the Wednesday, as will several all-day tours. An exhibition of scientific equipment is planned. Full social and accompanying persons programmes will be organised. The Conference language will be English and the full programme will be published in the March 1986 issue of Analytical Proceedings. SPONSORSHIP IUPAC and The Federation of European Chemical Societies (FECS event No. 78) sponsorship has been obtained. REGISTRATION Further details and registration forms may be obtained from: Miss P. E. Hutchinson, Secretary of The Analytical Division, Royal Society of Chemistry, Burlington House, London W1V OBN, UK.

ISSN:0267-9477    

DOI:10.1039/JA98601BX003

出版商:RSC    

年代:1986

数据来源: RSC

摘要:

ASU REFERENCE INDEX VOL. 1 (1986) 31 Zeng, X., 861322, 861396, Zeng, Y., 8611829 Zerlia, T., 861336 Zhan, G., 8611015 Zhan, L., 86163 Zhan, Y., 8611340 Zhang, B., 86133 Zhang, G., 861735, 8611826 Zhang, H., 8616, 8611692, Zhang, J., 861751, 8611956 Zhang, L., 8611287, 8611289 Zhang, P., 861377 Zhang, Q., 8611785 Zhang, R., 8611824 Zhang, T., 861435 Zhang, W., 861432 861C1128, 8611710, 8611824 8611857 Zhang , W.-M., 86lC1183, Zhang, Y., 8611710 Zhang, Y. K., 86128 Zhang, Y . Z., 861C850 Zhang, Z., 86K1128, 8611290, Zhao, C. Y., 8611997 Zhao, J., 8611094 Zhao, S., 861383 Zhao, Y., 8611289 Zheng, C., 8611093 Zheng, J., 8611290 Zheng, S., 86115, 8611290 Zheng, T. L., 8611997 Zheng, Y., 861339, 8611009, 8611101, 8611744 Zhi, L., 861C1226 861C1216 8611785 Zhi, Y. P., 861C1226 Zhong, C., 8611824 Zhou, G., 86/32, 8612021 Zhou, H., 861960 Zhou, L., 861432, 861678 Zhou, N., 8611705 Zhou, W., 8611297 Zhou, Y., 8611749 Zhou, Z., 8611283 Zhu, F., 861339, 8611744 Zhu, H., 861360 Zhu, M.-H., 861C1183, 861C1216 Zhu, S.F., 8611961 Zhu, Y . P., 861C1237 Zhuang, M., 861977 Zhukova, M. P., 86/41 Ziang, L., 861971 Zicai, C., 861C889 Zimmer, K., 861C129, 861C136, 861C138, 861265, 86/C292,861C293, 861C294, 861C299, 861C300, 861C611, 8611307, 8611425 Zimmermann, R., 861319 Zink, J. B . , 861C874 Zizak, G., 8611400 Zolotov, Yu. A., 861707, 8611617, 8611827 Zoloyov, Yu. A., 861734 Zsuzsanna, B., 86175 Zvyagintsev, A. M., 861422 Zweegers, F. P. A., 861C643 Zybin, A. V., 8611424 Zyrnicki, W., 861264, 8611776vi Analytical Journals from The Royal Society of Chemistry The Analyst An international journal of high repute containing original research papers on the theory and practice of all aspects of analytical chemistry drawn from a wide range of sources.It also publishes regular critical reviews of important techniques and their applications, short papers and urgent communications (which are published in 5-8 weeks) on important new work, and book reviews. Special issues devoted to major conferences and particular analytical themes are regularly published. Over 400 papers are submitted to TheAnalysteach year, 70% of which are from outside the UK; papers are received from about 40 different countries annually. With circulation to nearly 100 countries and 70% of subscribers being outside the UK, The Analyst is a truly international journal.Rapid publication is a feature of the journal, about 20% of all the papers being published in 25 weeks or less from receipt and the median time to publication from acceptance being about 20 weeks. Subscribers are therefore assured of reading the latest, up-to-date work in The Analyst. 12 issues per annum Subscription 1986 €147.00 ($285.00) o/seas El 62.00 Special Issues of The Analyst Special Issues of The Analyst are available separately containing papers from The First and Second Biennial National Atomic Spectroscopy Symposia and SAC '83. The following issues are still available: The Analyst, February 1983 containing papers from the First Biennial National Atomic Spectroscopy Symposium. Price E9.50 ($1 9.50) The Analyst, March 1984 containing papers from the SAC '83 Conference.Price E9.50 ($1 7.00) The Analyst, May 1985 containing papers from The Second Biennial National Atomic Spectroscopy Symposium . Price s12.00 ($22.00) Ordering: Orders should be sent to The Royal Society of Chemistry Distribution Centre, Blackhorse Road, Letchworth, Herts. SG6 1 HN, U.K. Non-RSC member prices quoted. RSC members are entitled to a discount on mostpublications. Details uvailable from:Assistant Membership Officer, The Royal Society of Chemistry 30 Russell Square, London WClB 5D& Llk US$ prices quoted. Analytical Proceedings Analytical Proceedings is the news and information journal of the Analytical Division of the Royal Society of Chemistry It contains special articles, reports of meetings, extended summaries of original papers presented at meetings organised by the Analytical Division, safety articles, reports of recent legislation, details of new equipment, and many other items of general interest to analytical chemists both in Britain and overseas.This journal provides authors with an excellent opportunity to publish details of ongoing projects and interim results for methods which are not yet sufficiently advanced to be submitted to a primary journal, to contribute non-comprehensive reviews of small areas of a particular discipline and, via the Analytical Viewpoints column, to submit philosophical contributions discussing the future of a particular technique or controversial issues affecting analytical chemists. Letters to the Editor are also published, making the pages of Analytical Proceedings the most important forum for the discussion of issues of analytical importance.12 issues per annum Subscription 1986 €69.00 ($1 34.00) o/seas €76.00 Ana lytica I Abstracts Analytical Abstracts endeavours to cover the whole field of analytical chemistry, providing around 12,000 abstracts per annum of papers and books considered to be of importance and interest to analytical chemists. The journal comprises nine main sections: general analytical chemistry; inorganic chemistry; organic chemistry; biochemistry; pharmaceutical chemistry; food; agriculture; environmental chemistry; and apparatus and techniques. A subject index is provided in each issue and a volume index is produced annually. 12 issues per annum Subscription 1986 821 9.50 ($425.00) o/seas 8241 .OO Ana lytica I Abstracts On I i ne Plans are in hand to make Analytical Abstracts accessible online.Further details may be obtained from Sales & Promotion Dept. The Royal Society of Chemistry The University Nottingham NG7 2RD England. Package Prices 1986 The Analyst, Analytical Abstracts and Analytical Proceedings €375.00 ($726.00) o/seas €41 2.00 The Analyst and Analytical Abstracts €329.00 ($636.00) o/seas €361 .OO The Analyst and Analytical Proceedings €1 84.00 ($356.00) o/seas €202.00vi Analytical Journals from The Royal Society of Chemistry The Analyst An international journal of high repute containing original research papers on the theory and practice of all aspects of analytical chemistry drawn from a wide range of sources.It also publishes regular critical reviews of important techniques and their applications, short papers and urgent communications (which are published in 5-8 weeks) on important new work, and book reviews. Special issues devoted to major conferences and particular analytical themes are regularly published. Over 400 papers are submitted to TheAnalysteach year, 70% of which are from outside the UK; papers are received from about 40 different countries annually. With circulation to nearly 100 countries and 70% of subscribers being outside the UK, The Analyst is a truly international journal. Rapid publication is a feature of the journal, about 20% of all the papers being published in 25 weeks or less from receipt and the median time to publication from acceptance being about 20 weeks.Subscribers are therefore assured of reading the latest, up-to-date work in The Analyst. 12 issues per annum Subscription 1986 €147.00 ($285.00) o/seas El 62.00 Special Issues of The Analyst Special Issues of The Analyst are available separately containing papers from The First and Second Biennial National Atomic Spectroscopy Symposia and SAC '83. The following issues are still available: The Analyst, February 1983 containing papers from the First Biennial National Atomic Spectroscopy Symposium. Price E9.50 ($1 9.50) The Analyst, March 1984 containing papers from the SAC '83 Conference. Price E9.50 ($1 7.00) The Analyst, May 1985 containing papers from The Second Biennial National Atomic Spectroscopy Symposium . Price s12.00 ($22.00) Ordering: Orders should be sent to The Royal Society of Chemistry Distribution Centre, Blackhorse Road, Letchworth, Herts.SG6 1 HN, U.K. Non-RSC member prices quoted. RSC members are entitled to a discount on mostpublications. Details uvailable from:Assistant Membership Officer, The Royal Society of Chemistry 30 Russell Square, London WClB 5D& Llk US$ prices quoted. Analytical Proceedings Analytical Proceedings is the news and information journal of the Analytical Division of the Royal Society of Chemistry It contains special articles, reports of meetings, extended summaries of original papers presented at meetings organised by the Analytical Division, safety articles, reports of recent legislation, details of new equipment, and many other items of general interest to analytical chemists both in Britain and overseas. This journal provides authors with an excellent opportunity to publish details of ongoing projects and interim results for methods which are not yet sufficiently advanced to be submitted to a primary journal, to contribute non-comprehensive reviews of small areas of a particular discipline and, via the Analytical Viewpoints column, to submit philosophical contributions discussing the future of a particular technique or controversial issues affecting analytical chemists.Letters to the Editor are also published, making the pages of Analytical Proceedings the most important forum for the discussion of issues of analytical importance. 12 issues per annum Subscription 1986 €69.00 ($1 34.00) o/seas €76.00 Ana lytica I Abstracts Analytical Abstracts endeavours to cover the whole field of analytical chemistry, providing around 12,000 abstracts per annum of papers and books considered to be of importance and interest to analytical chemists.The journal comprises nine main sections: general analytical chemistry; inorganic chemistry; organic chemistry; biochemistry; pharmaceutical chemistry; food; agriculture; environmental chemistry; and apparatus and techniques. A subject index is provided in each issue and a volume index is produced annually. 12 issues per annum Subscription 1986 821 9.50 ($425.00) o/seas 8241 .OO Ana lytica I Abstracts On I i ne Plans are in hand to make Analytical Abstracts accessible online. Further details may be obtained from Sales & Promotion Dept.The Royal Society of Chemistry The University Nottingham NG7 2RD England. Package Prices 1986 The Analyst, Analytical Abstracts and Analytical Proceedings €375.00 ($726.00) o/seas €41 2.00 The Analyst and Analytical Abstracts €329.00 ($636.00) o/seas €361 .OO The Analyst and Analytical Proceedings €1 84.00 ($356.00) o/seas €202.00vi Analytical Journals from The Royal Society of Chemistry The Analyst An international journal of high repute containing original research papers on the theory and practice of all aspects of analytical chemistry drawn from a wide range of sources. It also publishes regular critical reviews of important techniques and their applications, short papers and urgent communications (which are published in 5-8 weeks) on important new work, and book reviews.Special issues devoted to major conferences and particular analytical themes are regularly published. Over 400 papers are submitted to TheAnalysteach year, 70% of which are from outside the UK; papers are received from about 40 different countries annually. With circulation to nearly 100 countries and 70% of subscribers being outside the UK, The Analyst is a truly international journal. Rapid publication is a feature of the journal, about 20% of all the papers being published in 25 weeks or less from receipt and the median time to publication from acceptance being about 20 weeks. Subscribers are therefore assured of reading the latest, up-to-date work in The Analyst. 12 issues per annum Subscription 1986 €147.00 ($285.00) o/seas El 62.00 Special Issues of The Analyst Special Issues of The Analyst are available separately containing papers from The First and Second Biennial National Atomic Spectroscopy Symposia and SAC '83.The following issues are still available: The Analyst, February 1983 containing papers from the First Biennial National Atomic Spectroscopy Symposium. Price E9.50 ($1 9.50) The Analyst, March 1984 containing papers from the SAC '83 Conference. Price E9.50 ($1 7.00) The Analyst, May 1985 containing papers from The Second Biennial National Atomic Spectroscopy Symposium . Price s12.00 ($22.00) Ordering: Orders should be sent to The Royal Society of Chemistry Distribution Centre, Blackhorse Road, Letchworth, Herts. SG6 1 HN, U.K. Non-RSC member prices quoted. RSC members are entitled to a discount on mostpublications.Details uvailable from:Assistant Membership Officer, The Royal Society of Chemistry 30 Russell Square, London WClB 5D& Llk US$ prices quoted. Analytical Proceedings Analytical Proceedings is the news and information journal of the Analytical Division of the Royal Society of Chemistry It contains special articles, reports of meetings, extended summaries of original papers presented at meetings organised by the Analytical Division, safety articles, reports of recent legislation, details of new equipment, and many other items of general interest to analytical chemists both in Britain and overseas. This journal provides authors with an excellent opportunity to publish details of ongoing projects and interim results for methods which are not yet sufficiently advanced to be submitted to a primary journal, to contribute non-comprehensive reviews of small areas of a particular discipline and, via the Analytical Viewpoints column, to submit philosophical contributions discussing the future of a particular technique or controversial issues affecting analytical chemists.Letters to the Editor are also published, making the pages of Analytical Proceedings the most important forum for the discussion of issues of analytical importance. 12 issues per annum Subscription 1986 €69.00 ($1 34.00) o/seas €76.00 Ana lytica I Abstracts Analytical Abstracts endeavours to cover the whole field of analytical chemistry, providing around 12,000 abstracts per annum of papers and books considered to be of importance and interest to analytical chemists. The journal comprises nine main sections: general analytical chemistry; inorganic chemistry; organic chemistry; biochemistry; pharmaceutical chemistry; food; agriculture; environmental chemistry; and apparatus and techniques. A subject index is provided in each issue and a volume index is produced annually. 12 issues per annum Subscription 1986 821 9.50 ($425.00) o/seas 8241 .OO Ana lytica I Abstracts On I i ne Plans are in hand to make Analytical Abstracts accessible online. Further details may be obtained from Sales & Promotion Dept. The Royal Society of Chemistry The University Nottingham NG7 2RD England. Package Prices 1986 The Analyst, Analytical Abstracts and Analytical Proceedings €375.00 ($726.00) o/seas €41 2.00 The Analyst and Analytical Abstracts €329.00 ($636.00) o/seas €361 .OO The Analyst and Analytical Proceedings €1 84.00 ($356.00) o/seas €202.00

ISSN:0267-9477    

DOI:10.1039/JA98601BP005

出版商:RSC    

年代:1986

数据来源: RSC

摘要:

6 JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL. 1 Historical Corner The Origin of Spectra. Who was First? The explanation of such a striking natural phenomenon as the colours of the rain- bow had naturally occupied the minds of philosophers for many centuries when Isaac Newton, then Professor of Math- ematics in Cambridge University, des- cribed in his letter to the Royal Society in 1672 (Phil. Trans. R. Soc., 1672, No. 80, 3075), his experiments on the production of coloured spectra by glass prisms. In this paper, which is a model of logical thought and lucid exposition, he concluded that “Light consists of rays differently refrang- ible” and that “As the rays of light differ in degrees of refrangibility so they also differ in their disposition to exhibit this or that colour.” In the same paper he made use of his conclusions to explain “Why the colours of the rainbow appear in falling drops of rain.” Newton, with this paper, is generally regarded as the father of spec- troscopy and certainly as the first to explain the spectral properties of light in a comprehensive fashion.Yet the experi- ments Newton used to demonstrate these points had largely been performed much earlier by Ioannes Marcus Marci of Kron- land (1595-1667), Professor of Medicine at Prague University. In his book “Thau- rnantias. Liber de arcu coelesti deque colorurn apparentiurn natura ortu et cau- sis,” published as early as 1648, he also explained “the origin of the rainbow by the diffraction and reflection of light on drops of water.” Marcus Marci’s life and work are briefly reviewed in the booklet edited by M.Vobecky, “The Czechoslo- vak Spectroscopic Society by the Czecho- slovak Academy of Sciences, 1949-84,” Prague 1984, from which the above quota- tion and photograph are reproduced with their kind permission. Although priority in many respects must go therefore to Marci, Newton’s studies clarified the concepts and in par- ticular he performed the crucial further experiment of recombining the dispersed coloured spectrum to reproduce white light. Newton’s contribution to a com- prehensive understanding of the nature of light and the production of spectra by refraction must still be regarded as semi- nal but we should accord some of the credit to the less well known Ioannes Marcus Marci of Kronland.Two members of the JAAS Advisory Ioannes Marcus Marci of Kronland Plaque Board, Sir Alan Walsh and Professor T. S. West have been awarded the Ioannes Marcus Marci of Kronland plaque by the Czechoslovak Academy of Sciences for their services to spectro- scopy. The latest spectroscopist to receive this honour is Professor C. L. Chakrabarti of Carleton University, Ottawa, Canada. Allan M. Ure Macaulay Institute, A berdeen, UK ASU Highlights The ASU review in this issue is the first of an annual series aimed at keeping the analyst abreast of the latest developments and applications of atomic spectrometric techniques in environmental analysis. The sample types covered include air and atmospheric particulates, waters, soils, plants, fertilisers and related materials. Over the past 12 months, growth of interest in speciation has been high- lighted, reflecting both improved detec- tability for many elements and an increas- ing awareness of the power of hybrid techniques, particularly of atomic spec- trometry coupled with chromatography. Direct analysis of environmental materials (with minimal or no sample pre-treatment) is also attracting consider- able attention, although many improved conventional sample preparation proce- dures have also been suggested. Platform- in-furnace and Zeeman background cor- rection techniques are .now being more widely used in AAS in routine analytical laboratories. Flow injection is also mak- ing its presence more and more felt where rapid sample throughput is deemed neces- sary, and is increasingly seen as a viable approach to rapid sample pre-treatment prior to atomisation/excitation. Malcolm S. Cresser University of Aberdeen, UK

ISSN:0267-9477    

DOI:10.1039/JA9860100006

出版商:RSC    

年代:1986

数据来源: RSC

摘要:

JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL. 1 7 Conferences and Meetings Inductively Coupled Plasma Mass Spec- gram per Litre Level by Coupled HPLC- spectroscopy, catalytic and kinetic trometry AAS. ” methods, chromatography, electroanaly- March 6, 1986, London, UK For further information contact The tical methods, enzyme techniques, flow A joint half-day meeting of the Atomic Secretary ASU, Dr. A. M. Ure, injection methods, immunoassay, mass Spectroscopy and Microchemical Macaulay Institute for Soil Research, spectrometry, microanalysis, molecular Methods Groups of the Analytical Divi- Craigiebuckler, Aberdeen AB9 2QJ. spectroscopy, probe methods, radio- sion of the RSC will be held at The chemistry, sample preparation, pre- Geological Society, Burlington House, Trace Element Analytical Chemistry in concentration and separation, thermal London W1.Medicine and Biology methods, X-ray emission and other X-ray Speakers are expected to include: April 21-23, 1986, Neuherberg, FRG methods. Materials and Areas of Applica- Dr. J. Cantle (VG Isotopes Ltd.) a The fourth international workshop on this tion: agricultural, atmospheric, biological representative of SCIEX; Dr. C. Pickford subject will be held in the Gesellschaft fur and microbiological, clinical, environ- (Harwell, a user); Dr. P. Allenby (British Strahlen- und Umweltforschung and is mental, food and drink, geological, indus- Nuclear Fuels Ltd., a user); and Dr. A. R. intended to bring together analytical and trial and metallurgical, pharmaceutical, Date (Institute of Geological Sciences), biomedical specialists.The topics covered plastics, rubbers and textiles, surfaces, who will give an overview of the subject. by the workshop will include bioavailabil- water and effluents. Other Aspects: auto- For further information contact Dr. ity, speciation, parenteral nutrition, mation and robotics, biotechnology, che- R. B. Smith, Hilger Analytical, West- recommended dietary allowances, in- mometrics, data processing, education, wood Industrial Estate, Ramsgate Road, teractions and analytical techniques. historical, microbiological, clinical, envi- Margate, Kent CT9 4JL. For information contact Dr . Peter ronmental, food and drink, geological, Schramel, Gesellschaft fur Strahlen- und industrial and metallurgical, pharmaceut- Umweltforschung mbH, AG ical, plastics, rubbers and textiles, sur- RSC Annual Chemical Congress “Spurenelementanalytik,” Ingolstadter faces, water and effluents, microcom- April 8-1 1, 1986 Coventry, UK Landstr.1, D-8042 Neuherberg, FRG. puters and microprocessors, optical- The Annual Chemical Congress of the fibres, quality control, sensors, the RSC will be held at the University of Second International Symposium on Bio- integrated laboratory. Warwick. The Analytical Symposium will logical Reference Materials In addition there will be update be on New Spectroscopic Sensors and April 24-25, 1986, Neuherberg, FRG courses, workshops, an exhibition and a Techniques, and will include papers by This symposium will be held immediately social programme. Professor S.Greenfield [ASIA (Atmiser after the workshop on Trace Element For further information contact Miss Source ICPs in Atomic Fluorescence Analytical Chemistry in Medicine and P. E. Hutchinson, Secretary of the Ana- Spectrometry)] and Professor G. Horljck Biology. As with the latter meeting, lytical Division, Royal Society of Che- (lCP-MS) together with a poster SeSS1on contributed papers are sought. mistry, Burlington House, Piccadilly , On New Methods in Atomic Spec- London W1V OBN. trometry. The Theophilus Redwood Lecture On wandte Physikalische Chemie, Kernfor- Analytiktreffen 1986 For information on the meeting contact Dr. Markus Stoeppler, Institut fur Ange- schungsanlage Julich GmbH, Postfach September 15-19,1986, Neubrandenburg, 1913, D-5170 Julich 1, FRG.DDR This meeting consists of Analytiktreffen and IX CANAS, conferences on research and analytical applications of atomic spec- troscopy and specifically analytical atomic be given by Professor G* Hieftje, entitled “Models, Measure- ments, Methods and Machines.” For further information contact Dr. John F. Gibson, The Royal Society of SAC 86/3rd BNASS Chemistry, Burlington House, Piccadilly, JULY 20-26, 1986, Bristol, UK London W1V OBN. This conference, which will be held in the University of Bristol, is organised by the spectroscopy, The confer- Analytical Division of the Royal Society ence languages Spectroscopy Group of the Institute of discussions be German, Atomic Spectrometry Updates Symposium of Chemistry in conjunction with the and Russian. The lectures, posters and The ASU (formerly AIUAS) symposium Physics.The Plenary Lectures will be Of atomic absorp- will be a joint meeting with the Atomic given by Professor J. H. Knox (Edin- tion spectrometry, atomic emission ’IJec- Spectroscopy Group of the RSC, to be burgh), Professor M. Bonner Denton trometry ’park, laser, high fie- held at Sheffield City Polytechnic, Mar- (Tuscon, AZ, USA), Professor B. V. quency, and discharge shall Hall, Sheffield, UK. Symposium L’Vov (Leningrad, USSR) and Professor techniques)7 atomic fluorescence spec- fees will be as follows: RSC members &18, G. Tolg (Dortmund, FRG) and the trometry and X-ray fluorescence spec- non-members 225 and students &5. Bed Invited Lecturers will include J. F. Alder, trometry* and breakfast for the night of April 14 M.Barber, M. S. Cresser, A. R. Date, J. may be reserved at Marshall Hall at a cost Goldsmith, J. G. Grasselli, D. A. Hick- Dr* man, w. Horwitz, R. D. Snook, v. of f12. The speakers and titles will be: J. M. Sychra, A. Thorne, A. Townshend, G. DDR-7010 Leipzig, Talstr. 35, GDR. Mermet, “Trends in ICP Spectrochem- Werner and T. S. West. There will also be istry”; M. Thompson, “High Precision an Association of British Spectroscopists FACSS ’86 Analysis by ICP-OES”; D. J. Halls, Lecturer, Professor L. de Galan. In addi- September29-October 3,1986, St. Louis, “Achieving Faster Analysis by Elec- tion to the above, contributed papers and MO, USA trothermal AAS”; and L. C. Ebdon, K. posters have already been offered in the The Federation of Analytical Chemistry Evans, S.J. Hill and R. Jones, “The following fields. Techniques: atomic and Spectroscopy Societies will hold its Determination of Tributyltin at the Nano- absorption, fluorescence and emission 1986 meeting at the Cervantes Conven- April 15 1986, Sheffield, UK ‘Over the theory and For further information ‘Ontact sc. K* Dittrich7 Universitat Leipzig, Sektion Chemie,8 JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL. 1 tion Center and Sheraton Hotel, St. Louis. Among the topics dealt with in papers and posters will be atomic spectro- scopy, separations, NMR, vibrational spectroscopy, general techniques (e.g., chemiluminescence, mass spectrometry, chemometrics) , general applications , new technology (e.g., simulation, artificial intelligence, non-lineadlaser) .Call for papers: title, author(s), address and telephone number should be sent to the Dr. S. Fleming, Program Manager, FACSS (Titles), 24 Crestfield Rd., Wilm- ington, DE 19810, USA, by March 28 1986. A 250 word abstract will be due by June 1 1986. Workshops and short courses will again be offered. For exhibition details contact Dr. E. G. Brame, Jr., Exhibit Director, 13 North Cliff Dr., Wilmington, DE 19089-1623, USA. XXV Colloquium Spectroscopicum Inter- nationale June 21-26,1987, Toronto, Canada The XXV Colloquium Spectroscopicum Internationale will be held at the Hilton Harbour Castle, Toronto. The meeting is sponsored by the Spectroscopy Society of Canada, the Society for Applied Spectro- scopy (USA) and the National Research Council of Canada. The core of the scientific programme will consist of two plenary lectures, by Nobel Laureates Dr. Gerhard Herzberg and Professor Arthur L. Schawlow, and about 35 invited lectures by young scientists. The other lectures will be selected from submitted abstracts. There are no plans for poster sessions. The invited and submitted presentations will be based on recent research, rather than reviews of past work. For additional information contact Mr. L. Forget, Executive Secretary CSI XXV, National Research Council, Canada, Ottawa, Canada KIA OR6.

ISSN:0267-9477    

DOI:10.1039/JA9860100007

出版商:RSC    

年代:1986

数据来源: RSC

摘要:

8 JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL. 1 Future Issues will lnclude- Determination of Arsenic, Selenium and Cadmium in Marine Biological Tissue Samples Using a Stabilised Temperature Platform Furnace and Comparing Deuterium Arc with Zeeman-effect Background Correction Atomic Absorp- tion Spectrometry-Bernhard Welz and Gerhard Schlemmer Constant-temperature Atomiser - Com- puter Controlled Echelle Spectrometer System for Graphite Furnace Atomic Emission Spectrometry-Erik Lundberg, Douglas C. Baxter and Wolfgang Frech Determination of Lead by Graphite Fur- nace Atomic Absorption Spectrometry Using Argon - Hydrogen Purge Gas with Low Temperature Atomisation-Ni Zhe- ming, Han Heng-bin and Le Xiao-chun Hydride Generation Atomic Absorption Determination of Arsenic in Marine Sedi- ments, Tissues and Sea Water with In-situ Concentration in a Graphite Furnace- Ralph E.Sturgeon, s. N. Willie and s. s. Berman The Problem of Background Correction in the Determination of Chromium in Urine by Electrothermal Atomic Absorption Spectrometry-David J. Halls and Gordon S. Fell Determination of Trace Rare Earth Ele- ments in Uranium by Inductively Coupled Plasma Optical Emission Spectrometry after Cellulose Column Pre- concentration-P. S. Murty and Raman Inductively Coupled Plasma Emission Spectrometry for the Analysis of Rare Earth - Transition Metal Ultra-thin Mag- netic Films-Alfredo Sanz-Medel and Jose Enrique Sanchez Uria The Decay of an Inductively Coupled Argon Plasma above the Load Coil-Mao Huang and Keling Liu Atomic Spectrometry Update The Update in the April issue is-Clinical Samples, Foods and Beverages-Alistair A. Brown, David J. Halls and Andrew M. Barnes Taylor

ISSN:0267-9477    

DOI:10.1039/JA986010008b

出版商:RSC    

年代:1986

数据来源: RSC

摘要:

JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL. 1 9 Volatilisation Studies of Cadmium Compounds by the Combined Quartz Furnace and Flame Atomic Absorption Method: Effects of Magnesium Chloride and Ascorbic Acid Additives Tibor Kantor and Laszlo Bezur Technical University of Budapest, Institute for General and Analytical Chemistry, H- 152 1 Budapest, Hungary A flame atomic absorption spectrometer was coupled to a modified thermoanalytical quartz furnace for the element-specific detection of evolved decomposition products. Heating programmes with a constant heating rate (0.8 “C s-I) and with an exponentially decreasing heating rate (typically 50-5 “C s-1) were applied in the range 25-950 “C. Sample holders made of platinum, electrographite and solid pyrolytic graphite were used in furnace atmospheres of variable oxygen concentration. Decomposition and vaporisation of Cd(N03)2, CdCI2, MgCI2, ascorbic acid and mixtures of these compounds were studied.The radiation scatter of the aggregates formed from the ascorbic acid by decomposition was detected in a flow cuvette. Because of the extremely long life of the atomic cadmium vapour, cold vapour detection of this species was also feasible in the combined system. This was used to supplement the flame atomic absorption measurements in elucidating vaporisation mechanisms. Samples in the form of aqueous solutions and occasionally as solids were applied to the furnace. It was found that the hydrolysis of CdCI2 and MgCI2 takes place to a lesser extent on increasing the sample mass and the heating rate and by using pyrolytic graphite and platinum sample holders. The enhanced rate of hydrolysis on the surface of porous graphite is explained by an adsorption effect (adsorption hydrolysis).The fraction of a hydrolysing chloride salt evolved in chloride form is also dependent on the pre-heating conditions. In the presence of ascorbic acid, Cd(l), CdO(s) and MgO(s) are formed from both chloride and nitrate salts of these elements in the first period of heating. On the surface of the pyrolytic sample holder, the formation of Cd(l) is enhanced in the presence of ascorbic acid and thus complete evaporation of cadmium can be achieved at low temperature (32tL460 “C). The vaporisation of CdO(s) takes place by thermal dissociation from both platinum and graphite surfaces at a temperature (ranging from 580 to 800 “C) that depends on the effective oxygen concentration close to the sample.The decomposition products of the nitrate anion activate the graphite surface, which enhances the vaporisation rate of CdO(s) from such a surface. Keywords: Combined atomisation source; atomic absorption detection for thermal analysis; CdCI, and MgCI, hydrolysis; Cd, CdC12, CdO and MgC12 vaporisation; ascorbic acid decomposition The atomic spectrometric methods developed for metal speciation involve high-temperature volatilisation as one of the separation methods. 1-3 When using accurate temperature control and measurement, these systems provide thermo- analytical information, i.e., an “evolved gas analysis” can actually be performed.2.3 The other aspects of the use of atomic spectrometric observation for thermal analysis are represented by the studies of high-temperature reactions of technological4.5 and analyticab7 interest.Some of the com- bined spectroscopic sources have been found to be particularly useful for these purposes (see references cited in reviews 1 and 8). This paper attempts to clarify further the mechanism of chloride interference effects encountered when cadmium is determined by electrothermal atomisation (ETA) procedures. ETA methods are widely used for the determination of cadmium in clinical and environmental analysis. Slavin et uL.~ have recently reviewed the literature on the subject (71 references) and have studied in detail the effects of instrumen- tal parameters and different sample matrices on the atomic absorption sensitivity of this element.The presence of alkali and alkaline earth metal chlorides ( e . g . , magnesium chloride) have especially severe suppressive effects on the cadmium ~ignal.9~10 Various organic matrices ( e . g . , organic acids) also have significant effects in this respect. Under the influence of ascorbic acid additive (“matrix modifier”), the atomisation temperatures for lead11 and cadmium decrease. 12 The vapori- sation characteristics of cadmium halides have been studied with respect to sample loss during pre-heating (“ashing” or “charring”) and dissociation in the gas phase, and various additives have been recommended for increasing atomic absorption sensitivity.9J3-15 The dissociation of metal halide molecules in the gas phase could be increased by application of a platform sample holder15 and by means of a constant- temperature furnace.16 Other workers have investigated the atomisation mechanism of cadmium oxyacid salts17-” and determined the effect of the graphite tube structure on atomisation processes.20 Several workers have applied combined atomisation - radiation sources to study the vaporisation of cadmium compounds. Gegus et a1.21 used a combination of a ceramic furnace (“micro reactor”) and a stabilised arc discharge for this purpose, with either platinum or graphite sample holders. Significant differences were found in the vaporisation charac- teristics of cadmium depending on whether new or aged (multiply heated) graphite sample holders were employed.Robinson and Weiss22 used a dual stage atomiser for the speciation of cadmium compounds on the basis of their different vaporisation characteristics. Aziz et al.23 applied a combination of a graphite furnace and an inductively coupled plasma (ICP) for the determination of cadmium and studied the vaporisation of cadmium nitrate in the presence of various matrices. A similar combination was used by Crabi et al.,z4 who found that free cadmium atoms had an extremely long lifetime near room temperature, in agreement with our findings.25 The detectability of cadmium vapour at near ambient temperature was also utilised in this work. Experimental Instrumentation The combined quartz furnace and flame system is shown schematically in Fig. 1. Details of the furnace design and that of the temperature programmer have been described else-10 JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL.1 Burner Gas injector Mixing - chamber - Oxidant 1 - G + & T z T ” a l v e t Furnace gas Cooling gas Auxiliary cooling gas Fig. 1. atomic absorption system Schematic diagram of the combined quartz furnace - flame Pump I- + J’L I, - t Aerosol Fig. 2. radiation scatter method Windowless flow cuvette for detection of aerosols by a where.4 Argon was supplied as “furnace gas” (0.5 dm3 min-l) and “cooling gas” (0.8 dm3 min-I), unless indicated other- wise. A T-junction between the gas injector and the furnace outlet is incorporated for introducing “auxiliary cooling gas” (2 dm3 min-1) with the “valve” open.In these experiments, air was used as an auxiliary cooling gas, which contributed the “oxidant” gas (air) applied through the gas injector. A single-slot 10-cm burner was used to support a slightly reducing acetylene - air flame (observation flame height 10 mm). Because of the long lifetime of the cadmium atomic vapour, it was also possible to detect this species by switching off the acetylene flow and leaving all other conditions unchanged. This observation method will be referred to as the “cold vapour detection method” in the following discussion. For certain studies the sample components evolved in the furnace were transported into a flow cuvette, shown in Fig. 2. In this instance the valve shown in Fig. 1 was closed (no auxiliary cooling gas was applied) and a more heat-resistant silicone rubber tube (40 cm long) was used to connect the T-junction and the flow cuvette.With this system a higher sensitivity could be attained for the detection of cadmium vapour, but this was not desired in these present studies. The windowless cuvette shown in Fig. 2 was used for the detection of aggregates (aerosol particles) formed from ascorbic acid by heating, as this radiation scatter detection method has been applied for studying the thermal decomposition of several organic substances.4 The windowless version of flow cuvettes is useful for preventing the base-line drift experienced in earlier studies,4 which was caused by partial deposition of the aerosol particles on the cuvette windows. A Pye Unicam Model SP190A atomic absorption spec- trometer (equipped with a laboratory-made integrator unit) was operated under optical conditions suitable for the isolation of the Cd 228.8-nm line (Cd hollow-cathode lamp).The apparent absorbance signal caused by the radiation scatter of aerosol particles was detected at the same wavelength using a deuterium lamp. The temperature of the sample in the furnace was measured with a Pt/Pt - Rh thermocouple (which was in direct contact with the sample holder) and most of the studies were performed using a constant heating rate (0.8 “C s-I), referred to as the “slow heating” below. To attain “fast heating” for certain studies, the furnace was pre-heated to 950 “C and the sample holder (sitting on the measuring head of the thermo- couple and fixed in an isolating rod) was pushed rapidly into the furnace.Before this insertion, the sample holder was placed at the inlet part of the furnace tube to dry the sample at 130 “C. From the temperature versus time graphs recorded under these conditions an empirical function was obtained for the heating rate (RT): dT dt RT = - = 265 exp where T (“C) is temperature and t (s) is time. Equation (1) gives a good approximation of the heating rate in the range 350-850 “C under the conditions described. Accordingly, the values of RT were 52 “C s-1 at 350 “C and 8 “C s-1 at 850 “C. Heating rates in the ranges 130-350 and 850-950 “C were lower than those calculated from equation (1). The absorbance versus temperature graphs ( A - T curves) were directly recorded and were accepted only when two replicate recordings were in good visual agreement.Supplementary measurements were made with a DuPont Model 915 Thermal Evolution Analyser to investigate the decomposition of ascorbic acid. With this instrument a flame-ionisation detector is used for monitoring the evolution of organic species. For studying the reactions of ascorbic acid and certain metal salts in the solution phase, a Beckman Model 5260 recording spectrophotometer was used. Procedure Ringsdorff Type RWI spectrally pure graphite (“electrograph- ite”) and platinum foil were used to prepare sample holders in a “cup.” shape. Platform sample holders made of solid pyrolytic graphite (Perkin-Elmer) were also used in this work, as this material is becoming increasingly important in ETA methods.The electrographite sample holders were pre- conditioned at 950 “C. In studying the volatilisation of MgC12.6H20 at temperatures up to 950 “C, new sample holders were used for each measurement, because with repeated use MgO(s) accumulated on the surface of the sample holder. Aqueous solutions (1000 mg 1-1 of metal) were prepared from analytical-reagent grade CdC12 .2.5H20 and Cd(N03)2.4H20, from which 5-pl aliquots were injected on to the sample holders. The MgC12 (an aqueous solution of MgC12.6H20) was added to the CdC12 solution prior to injection when applied together, whereas ascorbic acid (5% aqueous solution) was added to the sample holder ( 5 pl) as a separate injection. Argon gas of the highest available purity was used, which, according to the manufacturer, contained 0.01 v01.-% of 02.In one experiment (see Table l ) , argon was passed through a purifying catalyst (BTS-Katalysator , BASF, Ludwigshafen am Rhein, FRG) to reduce the O2 content to 0.0001 vo1.-Yo. Results and Discussion Initial Vaporisation Temperature of Cadmium Metal, Cadmium Chloride and Cadmium Oxide Using a Platinum Sample Holder The characteristics of the initial observation temperature of vaporisation (Ti) have been discussed, and a method was suggested for the calculation of the Ti from vapour pressure and atomic absorption sensitivity data.7 The Ti value for magnesium oxide was determined with the use of a combined graphite furnace - flame atomic absorption method employing silver as a reference element.7 For the volatility studies carried out with the present quartz furnace - flame method, aJOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL.1 11 Table 1. Initial temperatures of vaporisation obtained using a platinum sample holder. Conditions used in this work: solid sample (s), 2 mg; solution sample, 5 p1 (1 mg ml-* Cd); heating rate, 0.8 "C s-1 Ti(exp.)l"C Ti Atmos- (calc.)/"C Sample phere Ref. 21 This work This work . . . . . . . . Cd(s) Ar* - 260 250 CdCI2.2.5H2O(s) Ar* 330 400 . . . . - CdCl, (aqueous solution) Ar* 240 320 - CdC12(1MHCI) Ar* - CdO(s) . . . . . . Air - - . . . . 280 290 CdO(s) Ar* 930 780 CdO(s) Ari- - 710 790 860 . . . . . . - . . . . . . * Oxygen concentration 0.01 v01.-Yo. -t Oxygen concentration 0.0001 v01.-Yo. reference material with a higher volatility than silver is desired, and NaCl was suitable for this purpose.Details of the measurements and data used for the calculation of Ti values of cadmium compounds will be published in a subsequent paper. A comparison of experimental and calculated Ti values found in this laboratory is given in Table 1, together with the experimental data of Gegus et af.,2J who used a combined atomic emission source. The Ti (calc.) values were derived assuming the following vaporisation reactions: . . . . Cd(s/l)eCd(g) * * (2) CdCl2(s)=CdCl,(g) . . . . . . (3) CdO(s) Cd(g) +?h.O,(g) . . . . (4) The experimental and calculated Ti values for cadmium metal were found to be in close agreement (Table 1). The experimental value for CdCI2 was closer to the calculated value when HC1 was added to the CdC12 solution.For the calculation of Ti(CdO), a purified argon environment was assumed with an oxygen partial pressure of 10-6 bar. The experimental value for Ti( CdO) under these conditions was found to be 80 "C lower than the calculated value. Table 1 indicates that the experimental value for T,(CdO) increased with increasing oxygen concentration in the furnace gas and it reached a value of 860 "C when argon was replaced with an air atmosphere. Comparative measurements were made in a nitrogen furnace atmosphere and it was observed that the A - Tcurves were consistent with the reported influence of oxygen partial pressure on Ti(CdO). The experimental values of Ti in Table 1 are in general agreement with the calculated values. The deviations obser- ved when two different combined sources are used to determine Ti(exp.) are not unexpected, considering the differences in the heating conditions and in the sensitivity of the detection methods.It can be concluded, therefore, that the data in Table 1 confirm the validity of reactions (2)-(4). Ascorbic Acid Fig. 3 represents the graphs characteristic of the thermal decomposition of ascorbic acid (ASC). Curve 1 was obtained by flame-ionisation detection (DuPont instrument) and curve 2 with radiation scatter detection under slow heating condi- tions. According to these curves (which are in close agree- ment), the decomposition of solid ASC takes place in the range 200-300 "C, the maximum rate of the process being at T , = 250-260 "C. When heated to 600 "C, a finely dispersed powder residue was obtained, the amount of which was 25.5% of the loaded sample and 62.3% of the theoretical carbon content of ASC.In the above experiments, solid ASC was decomposed under slow heating. When solutions of ASC were subjected to 100 200 300 400 500 600 Temperaturei'C Fig. 3. Thermal evolution analytical curves of ascorbic acid (ASC) detected by the flame-ionisation method (1) and by the radiation scatter method (2-4). 1, 5 mg of ASC, 2 dm3 h-1 of N2, aluminium holder, RT = 0.5 "C s-1; 2, 10 mg of ASC, 80 dm3 h-I of Ar, platinum holder, R, = 0.8 "C s-1; 3, aqueous solution of 1.5 mg of ASC, electrographite holder, fast heating; 4, as 3 but 3 mg of ASC thermal decomposition under fast heating conditions (curves 3 and 4 in Fig. 3), the maximum rate of decomposition was found at T,,, = 400-410 "C, about 150 "C higher than for solid ASC under slow heating conditions.In the experiments relevant to Figs. 4-9, a smaller amount of ASC (250 pg) was used and its radiation scatter signal could not be detected in the fast heating mode either. Magnesium Chloride Previously a combined graphite furnace - flame AAS method was used to investigate the volatilisation of hydrated magne- sium chloride (0.1 M HC1 solution) in the range 560-2400 "C applied on a polycrystalline electrographite sample holder .7 It was concluded that with the hydrated salt, partial hydrolysis takes place during heating, and a fraction vaporises according to the reaction MgC12(s) + MgCl,(g). The extent of hydrolysis depends greatly on the conditions of heating and the mass of the sample.Similar conclusions can be drawn from the A - T curves presented in Fig. 4. When the hydrated salt is heated slowly the evolution of MgC12(g) can be detected at Ti = 630 "C (curve 1). The absorbance maxima seen at higher temperatures (absorbance > 1) suggest that vaporisation takes place from a mixed condensed phase. In fact, several magnesium hydroxychloride compounds have been identified in such a melt.26 When an aqueous solution of 2% mlV Mg (MgC12), i . e . , 0.1 mg of Mg (MgCI2), was subjected to slow heating (RT = 0.8 "C s-I) a peak was not observed up to 950 "C and the measurements were therefore continued in a fast heating mode (curves 2-6 in Fig. 4). Using a pyrolytic graphite sample holder no signal was detected with 10 pg of Mg (MgC12), whereas application of 20 and 40 pg of Mg (MgCI2) resulted in curves 2 and 3, respectively [according to equation ( 1), RT = 20 "C s- 1 applied at 600 "C using the fast heating mode].The first peak in the range 170-320 "C (curve 3) can be explained by a blowing effect (removal of solid or liquid particles of sample) of the12 JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL. 1 HCl(g) evolved rapidly under fast heating. The hydrochloric acid was produced by the hydrolysis of the salt, and during a short drying period (up to 130 "C) it was not removed completely. It is expected that only the peak at Ti = 580 "C belongs to the MgC12(g) formed by volatilisation. With ASC added under otherwise identical conditions, no MgCl,(g) evolution is indicated (curve 4).Using an electrographite sample holder a vaporisation peak could not be detected with 20 pg of Mg (MgClZ), and on applying 40 pg of Mg (MgC12) curve 5 in Fig. 4 was recorded with a much smaller peak than that seen in curve 3 (pyrolytic graphite). These results suggest that MgC12.6H20 has a greater tendency to hydrolyse on the surface of the porous electrographite than on the surface of non-porous pyrolytic graphite. In the presence of ASC no MgClz(g) was produced from the electrographite surface either (curve 6). In summary, the evolution of MgC12(g) from hydrated MgC12 is hindered by the following factors: (a) a decrease in the mass or concentration of MgC12, (b) the use of a porous graphite sample holder, (c) a decrease in the heating rate and (d) the addition of ASC.The role of factors (a), (b) and (c) can be explained by their effect on the hydrolysis of magnesium chloride, as follows. With dilute aqueous solutions of MgC12, hydrolysis takes place at room temperature even in a sample holder with a non-reactive surface, and the degree of hydrolysis increases with sample dilution. It is known that adsorption hydrolysis takes place from neutral electrolyte solutions on the surface of activated carbon.27.28 It is likely that the sample holder prepared from polycrystalline electrographite and pre- conditioned at 950 "C has adsorption characteristics similar to those of activated carbon. The surface of carbon ignited in an inert gas of low oxygen content becomes basic and can bind acids.27 The binding of acids increases the hydrolysis of salts, and the hydroxides produced are retained in the pores of the activated carbon.* With more concentrated solutions hydroly- sis is limited at room temperature, and hydrated magnesium chloride remains on the surface when the temperature is increased to 130 "C. Water of crystallisation is released on further heating which can induce hydrolysis if the heating and the evaporation of water are not too rapid.7726 It may be assumed that the ASC additive blocks, at least partially, the pores of the graphite surface, resulting in a decrease in the adsorption hydrolysis of MgC12. From this, an increase in MgC12(g) evolution is expected if the adsorption hydrolysis remains the dominant process in the presence of ASC also.Because experience contradicted this expectation (curves 4 and 6 in Fig. 4), another hypothesis had to be found to explain the effect of ASC. Molecular absorption spectrophotometric measurements of pure ASC (10-4 M) and a mixture of MgC12 and ASC (both M) indicated that in the presence of MgC12 the absorption maximum of pure ASC was shifted from 258 to 248 nm, while the molar absorbance decreased by a factor of 0.67. Hence it can be concluded that the ASC reacts with MgC12 in aqueous solution at room temperature. During the thermal investig- tions (Fig. 4), the ASC was present in large excess, which would help to promote this reaction. The hydrochloric acid liberated in the solution phase is evolved in the first period of heating and the compound formed is decomposed to MgO(s) at higher temperature.* It is noted that adsorption hydrolysis can also take place on oxidised metal surfaces.27 In previous studies in this laboratory,2' certain anomalies (memory effect, non-linearity of analytical curves, etc.) were observed on the pneumatic nebulisation of neutral solutions of several salts (magnesium and cadmium salts, among others) and were explained by taking into account the adsorption hydrolysis that can occur on the surface of the metal injector tip of concentric nebulisers. 240 170 I 320 4- E r----1 i r" &20 5J 3 590 r-- I, 1- 4 760 630 r I I I I I I I I I 100 200 300 400 500 600 700 800 900 Tern perature/"C Fig. 4. Absorbance versus temperature curves for magnesium chloride using flame atomic absorption detection.1, 5 mg of MgC12.6H20, platinum holder, slow heating; 2,20 pg of Mg, pyrolytic graphite holder, fast heating; 3, as 2 but 40 pg of Mg; 4, as 2 but 40 pg of Mg + 250 pg of ASC; 5 , as 3 but electrographite holder; 6, as 4 but electrographite holder Under the spectrophotometric conditions described, the molecular absorption of a CdC12 - ASC solution was also studied (the vaporisation patterns of the dry residue of this mixture are depicted below). It was observed that the molecular absorption peak occurred at 261 nm, i.e., at a higher wavelength than that of pure ASC, and the molar absorptivity of the two-component system was 0.71 times lower. These results suggest that ASC also reacts with CdC12 in aqueous solution at room temperature. Recently, Slavin et aZ.30 summarised the importance of chloride interference effects in ETA methods.It has been found (see citations in reference 30) that the interference of MgC12 on the determination of lead is smaller if uncoated graphite tubes are used instead of pyrolytically coated tubes. This is explained by assuming that the "ordinary graphite" binds MgC12 to a greater extent by an intercalation process and thus the MgC12(g) is evolved at higher temperature than lead without exerting a gas-phase interference on this analyte. It seems to us that the intercalation of MgC12 was based on the analogy of the characteristics of other known examples of chlorine-containing compounds and there was no direct proof for this particular case. In the light of our results, it is clear that using an ordinary graphite tube in contact with the aqueous solution of MgC12 the hydrolysis of this salt takes place to a greater extent than on the surface of the pyrolytically coated tube during the pre-heating stage.Therefore, the evolution of MgC12(g) in the atomisation stage is less or it does not occur at all, depending on the other factors discussed above. Consider- ing the future prospects of solid pyrolytic graphite tubes and glassy carbon tubes,3O it can be predicted from our results that lowering the heating rate in the pre-heating stage will be more important with these materials for decreasing chloride inter- ferences. It must be noted, however, that the explanation and the prediction suggested do not apply to non-hydrolysing halide salts such as NaCl.JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL.1 13 Cadmium Nitrate Thermoanalytical (TG - DTG - DTA) studies31 of Cd(N0&.4H20 (75 mg, Pt sample holder, air atmosphere, RT = 0.05 "C s-1) showed that water of crystallisation was evolved in two steps in the range 50-250 "C. The anhydrous nitrate salt melted at 390 "C (DTA peak). However, a slow decomposition was observable from 330 "C and this process was completed at 430 "C. With the present method, applying 3 mg of Cd(N03)2.4H20 in a platinum sample holder (Ar atmosphere, RT = 0.8 "C s-1) and using flame atomic absorption detection, a sharp peak in the range 430-480 "C ( T , = 470 "C) and a larger second peak with Ti = 800 "C were observed. The first peak could not be detected with the cold vapour method, in contrast to the second peak. From radiation scatter measurements in a cuvette, it became evident that the low-temperature peak was caused by the blowing effect of the nitrogen oxide gases evolved rapidly from the melt of Cd(N03)2.It is not unexpected that with a heating rate 16-fold higher than that used in TG - DTG - DTA measurements the evolution of nitrogen oxide gases proceeds at a temperature higher by about 50 "C. With graphite furnace ETA methods, the atomisation of CdO(s) produced from Cd(N03)2 is explained by some workers18.20 as a solid-phase reduction -and vaporisation process, whereas others12J7J9,32 regard it as a thermal dissociation reaction. With the latter process some workers have proposed the interim formation of Cd(l) ,17J9 whereas others assume the validity of equation (4) under certain conditions.12732 Salmon and Holcombe20 found a higher appearance temperature of cadmium when using an oxygen content greater than 0.01% in the argon. This was explained by the chemisorption of oxygen at 500-900 "C in the graphite furnace, which decreased the rate of solid-phase reduction of CdO(s). L'vov and Ryabchuk32 questioned the possibility of solid-phase reduction on a graphite surface below 900 "C. They concluded also that graphite pre-heated to 200-600 "C in argon containing 0.5-1% of O2 binds oxygen at a higher rate than the graphite pre-heated in pure argon. More recently, Sturgeon et aZ.33 described a method for the determination of 0 2 in a graphite tube atomiser. It was shown unambiguously that by low-temperature heating in an argon atmosphere at an increased oxygen concentration, the graphite surface was activated for scavenging O2 at a much higher rate at elevated temperature.It has been proposed that oxidising gases formed by the thermal decomposition of oxyacid salts can also activate the graphite surface.2O It is also known that electrographite has a higher activity than pyrolytic graphite towards oxygen, and repeated heating at <2000 "C generally increases the affinity of graphite for oxygen.20,32,33 In Fig. 5, the A - T curves obtained with the cold vapour detection method are shown for Cd(N03)2 and Cd(N03)2 + ASC aqueous solutions when electrographite and pyrolytic graphite substrates are used (slow heating). The correspond- ing curves obtained with the flame atomic absorption detec- tion were almost identical, so they are not presented here.Curves 1-4 in Fig. 5 illustrate that atomic cadmium vapour is evolved inside the furnace and although the atoms are mixed with cold argon (first cooling step) and then with air (second cooling step, see Fig. l), free cadmium atoms still remain in a sufficient amount for atomic absorption detection. * Under the experimental conditions relevant to curve 1 (cold vapour detection), the time integrated signal was only 0.97 times ~ * It is noted that in earlier studies in this laboratory a similar characteristic of zinc atomic vapour was observed.6 Including the known case of mercury vapour, it follows that all the elements in Group IIB of the Periodic Table can be detected by the cold vapour atomic absorption method under certain conditions.600 1 710 I a NI 360 I I I I 1 I I 200 300 400 500 600 700 800 900 Tern peraturePC Fig. 5. Absorbance versus temperature curves for cadmium nitrate using cold vapour atomic absorption detection. Aqueous solutions, 5 pg of Cd, 250 pg of ASC, slow heating. 1, Cd(N03)*, electrographite; 2, Cd(N03), + ASC, electrographite; 3, Cd(N03),, pyrolytic graphite; 4, Cd(N0J2 + A X , pyrolytic graphite smaller than that using the flame atomic absorption detection. It is calculated that in the latter instance the rate of gas flow in the observation zone is about nine times higher than in the former. This and the close agreement of the integrated absorbance signals suggest that about one ninth of the material reaching the observation zone is atomic cadmium vapour.It should be noted that if the hot cadmium vapour evolved inside the furnace (Ar) is mixed with air in the first cooling step (see Fig. l), oxidation occurs and no cadmium signal is obtained without the use of the flame. No molecular absorption or non-specific scattering of the hollow-cathode lamp radiation was observed with or without a flame, as indicated by the zero absorbance signals measured when a deuterium lamp was used. This observation applies to the other spectral studies discussed in the following sections. As shown by curve 1 in Fig. 5, the evolution of Cd(g), from CdO(s) produced on decomposition of Cd(N03)2 on a porous graphite surface, is observed at 580 "C, which is 200 "C lower than the Ti(CdO) found for vaporisation from a platinum surface (Table 1).This can be explained by considering the high activity of pre-heated electrographite for oxygen,20J2J4 which results in a lower temperature of the reaction given by equation (4). The evolution of Cd(g) takes place at a much lower rate from a pyrolytic graphite surface (curve 3) than from an electrographite surface (curve l ) , which should be related to the lower activity of the pyrolytic sample holder towards oxygen. When ASC is added to Cd(N03)2 in an electrographite sample holder (Fig. 5, curve 2), an additional peak appears at Ti = 310 "C. The intense decomposition of ASC is completed at 300 "C (Fig. 3, curves 1 and 2), which just precedes the evolution of Cd(g). It may be assumed that the ASC or its decomposition products undergo reaction with Cd(N03)2 in the condensed phase and the compound formed decomposes to Cd(1) with further heating (the melting-point of cadmium metal is 321 "C).The vaporisation of cadmium metal was observable at Ti = 260 "C (Table l ) , i.e., at a lower temperature than under the conditions relevant to curve 2. It follows that in the latter instance the rate-determining step of14 JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL. 1 Cd(g) evolution is the decomposition of the intermediate compound. It can also be concluded from curve 2 that CdO(s) is formed from the major part of cadmium, which vaporises similarly to the situation when no ASC is present (curve 1). It is interesting that the effect of ASC additive becomes more pronounced with the use of a pyrolytic graphite sample holder (Fig.5 , curve 4). The vaporisation process taking place according to equation (2) is of greater significance and the second peak is shifted to a lower temperature (Ti = 450, T, = 600 "C). In curve 2 (electrographite) a slow evolution of Cd(g) between the two major peaks is also observable, which becomes a dominant peak in curve 4 (pyrolytic graphite). The significant differences between curves 2 and 4 can be correlated with the alteration of the form of the sample deposit. In the former instance the cadmium compounds are in contact with both the graphite crystals and the decomposition product of ASC in the pores of the electrographite. With the pyrolytic graphite the cadmium compounds are distributed in the decomposition product of ASC and this mixture forms an outer layer on the sample holder.The shift of the second vaporisation peak to lower tempera- tures (Fig. 5 , curve 4) may be explained by assuming that the finely dispersed carbon powder produced from ASC has even higher activity towards oxygen than the porous electrograph- ite. However, it is also possible that the decomposition product of ASC at 450 "C is not a pure carbon, but contains certain organic compounds that cause the reduction of CdO(s). According to the thermal evolution curve of ASC recorded with the use of flame-ionisation detection (Fig. 3, curve l), a small amount of decomposition product is also evolved at 330-530 "C. This must be some carbon and hydrogen containing gas that is not detectable with the radiation scatter method (curve 2).The curves presented in Fig. 6 were obtained when fast heating was applied for studying Cd(N03)2 and a Cd(N03)2 + ASC mixture. Recordings with flame atomic absorption detection (curves b) are also included in addition to the recordings relevant to the cold vapour detection method (curves a). Comparing these curves with those in Fig. 5, it is clear that the peak heights are greatly increased (the scale of absorbance is reduced to one quarter), but Ti and T, data are only slightly changed owing to the higher heating rate. It should be noticed, however, with this "fast heating mode" the heating rate decreases exponentially with increasing tempera- ture [see equation (l)].A comparison between curves 4a and 4b shows that cold vapour detection resulted in smaller peaks than flame atomic absorption detection in the presence of ASC using a pyrolytic sample holder. The time-integrated absorbance of curve 4a was a factor of 0.55 smaller than that of curve 4b. It can be seen from curves 3 and 4 in Fig. 3 that intense aerosol formation takes place from ASC in the range 330-510 "C when fast heating is applied. It is likely that the aggregates formed from ASC will adsorb a significant fraction of the cadmium atomic vapour, which otherwise tends to be deposited on the walls of the transport system.8 Hence the aggregates concerned serve as effective carriers of the cadmium vapour, resulting in an improved transport effi- ciency.8 As the aggregates are atomised in the flame the atomic absorption signal increases.Without flame atomisation (curve 4a), the fraction of cadmium adsorbed on the aggreg- ates cannot be detected by the atomic absorption method, and consequently a decrease in the signal is observed. Supplementary studies of the vaporisation of CdO(s) were performed using trace amounts of hexane vapour and trace amounts of isopropyl alcohol in the furnace atmosphere (Ar). Evolution of Cd(g) could be detected with the cold vapour method at Ti = 440 "C and Ti = 280 "C, respectively, owing to the heterogeneous reactions between CdO(s) and the gaseous decomposition products of these organic substances. Low- temperature evolution of cadmium (<450 "C) also takes place from mixtures of Cd(N03)2 and carbohydrates (e.g., glucose). It is known that the major part of the trace amounts of cadmium in tobacco is transferred into the cigarette smoke.34 This must be the consequence of the low-temperature reduction of cadmium compounds by the organic compounds and/or their decomposition products present. The trace amounts of cadmium in cigarette smoke could easily be detected with the present combined system using flame atomic absorption detection. To introduce the cigarette smoke into the transport system the cigarette was attached to the inlet of the "auxiliary cooling gas" (see Fig. 1) and was sucked in by the gas injector. Cadmium Chloride According to the thermoanalytical (TG - DTG - DTA) studies31 of crystalline CdC12.2.5H20 (48 mg, Pt sample holder, air atmosphere, RT = 0.05 "C s-I), water is released in two steps in the range 3&120 "C.The residue, which is CdC12, melts at 540 "C (DTA peak) and evaporates completely on heating to 690 "C ( T , = 660 "C). With the present method using flame atomisation, we observed the evolution of CdC12(g) at Ti = 400 "C when solid hydrate salt was applied (2 mg, Ar atmosphere, RT = 0.8 "C s-I), irrespective of the material of the sample holder (Pt, Si02 or graphite). The A - T curves of aqueous solutions of CdCl2 using electrographite sample holders and slow heating are shown in Fig. 7. Curves a and b represent absorbance measurements obtained with cold vapour detection and flame atomic absorption detection, respectively. According to curves l a and lb, obtained without additives, the first vaporisation peak (Ti = 370 "C) cannot be detected without flame atomisation, i.e., this peak is indicative of CdC12(g) evolution [equation 61 0 41,O 400 600 4b ' 740 I 730 I 4a 600 3b 3a : I 2 hl 3 2b 1 I I I I I 1 I 200 300 400 500 600 700 800 900 Tern peratu rePC Fig.6 . Absorbance versus temperature curves €or cadmium nitrate using (a) cold vapour detection and (b) flame atomic absorption detection. Aqueous solutions, 5 pg of Cd, 250 pg of ASC, fast heating. 1, Cd(N03)2, electrographite; 2, Cd(N03)2 + ASC, electrographite; 3, Cd(N03)*, pyrolytic graphite; 4, Cd(N03)2 + ASC, pyrolytic graphiteJOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL. 1 15 370 I 7 20 Ah ._ 370 790 4a E L 700 650 I 790 2 450 3 3b N 67O7Fo 800 3a 2b 2a I 440 370 I 500 600 l b - 1 600 I 1- l a I I I I 1 I 1 L 200 300 400 500 600 700 800 90 TemperaturePC Fig.7. Absorbance versus temperature curves for cadmium chloride using (a) cold vapour detection and (b) flame atomic absorption detection. Aqueous solutions, 5 pg of Cd, 5 pg of Mg (MgCl,), 250 pg of ASC, slow heating, electrographite sample holder. 1, CdCI,; 2, CdC1, + ASC; 3, CdCI, + MgCl,; 4, CdC12 + MgCI2 + ASC 400 I 4b 4a 3a A U I \ n l b l a 200 300 400 500 600 700 800 900 Temperature/'C Fig. 8. Absorbance versus temperature curves for cadmium chloride using (a) cold vapour detection and (b) flame atomic absorption detection. Conditions as in Fig. 7, but pyrolytic sample holder. 1, CdCl2; 2, CdCI2 + ASC; 3, CdC12 + MgCI2; 4, CdCl2 + MgCl2 +ASC (3)]. Cadmium chloride dissolved in water undergoes signifi- cant hydrolysis on the surface of electrographite in a similar manner to magnesium chloride (see above).This is proved by the vaporisation peaks with Ti = 600 and T, = 740 "C (curves l a and lb), which correspond to the evolution of Cd(g) from CdO(s) formed by hydrolysis of the chloride salt and decomposition of the hydroxide. It is interesting that these peaks are broader and appear at slightly higher temperature than the peak relevant to the same process [equation (4)], but the CdO(s) is produced by the decomposition of Cd(N03)2 (Fig. 5, curve 1). This difference may be related to the activation of the graphite surface by the oxidising gases evolved from the nitrate salt, which is not the case with the chloride salt.The low-temperature peaks (Ti = 320 "C) of curves 2a and 2b in Fig. 7 were obtained with ASC additive in a similar temperature range to that with Cd(NO& (Fig. 5 , curve 2). These correspond to the vaporisation model according to equation (2), as discussed above. The similarity of the shapes of curves 2a and 2b (without and with flame atomisation, respectively) suggests that no CdC12(g) is evolved from the residue of the aqueous solution of CdC12 + ASC mixture. This is due primarily to the reaction of these compounds in the solution phase, concluded from the molecular spectropho- tometric studies (see above). The second vaporisation peaks at T, = 630-640 "C (curves 2a and 2b) may be explained by the activity of the decomposition product of ASC for oxygen [vaporisation model according to equation (4)], discussed above.When MgC12 additive was employed with CdC12 (Fig. 7, curves 3a and 3b), similar A - Tcurves were obtained to those without additive (curves l a and lb). The curves recorded for the mixture of Cd(N0?)2 + MgCI2 (5 pg of Cd + 12 yg of Mg) were also almost identical with these. The first peak (Ti = 370 "C, curve 3b) is indicative of the fraction of cadmium liberated as CdC12(g), whereas the peaks in the range 650-800 "C are due to the evolution of Cd(g) from CdO(s). The fact that the MgC12 (5 pg of Mg) added does not influence these processes significantly is the consequence of its complete hydrolysis under the'conditions applied. It appears from consideration of curves 4a and 4b in Fig. 7 that the addition of ASC to the mixture of CdC12 + MgC12 results in the evolution of Cd(g) similarly to the situation when no MgC12 is present.However, in the latter instance (curves 2a and 2b) an interim peak is obtained at T, = 630-640 "C, which is not observed on addition of MgC12 (curves 4a and 4b). It is probable that the MgO(s) formed by hydrolysis decreases the affinity of the decomposition product of ASC for oxygen and this is reflected in the difference concerned. The A - T curves shown in Fig. 8 were obtained using a pyrolytic graphite sample holder, all other conditions being the same as those for Fig. 7. The significant changes in the curves relative to those in Fig. 7 are due primarily to the fact that virtually no hydrolysis of cadmium chloride takes place on the pyrolytic graphite surface, A much lower degree of magnesium chloride hydrolysis was also found on this surface (Fig.4). Hence the evolution of CdC12(g) (curves 1 and 3) and that of the Cd(g) (curves 2 and 4) takes place in a single step for the total (or dominant) mass of the cadmium sample, resulting in an increase in the magnitude of the vaporisation peaks. The A - T curves shown in Fig. 9 were obtained using fast heating. All the other conditions were identical with those in Fig. 8, except the absorbance scale, which was reduced to one fifth. The blowing effect of HCl(g) released at a high rate under fast heating conditions can be observed on several curves in the range 190-320 "C, in an analogous manner to that obtained with MgC12 solutions (Fig. 4).The atomic absorption detection of the cadmium-containing particles removed from the sample could only be detected, of course, when flame atomisation was used (curves b). Apart from these non-JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL. 1 840 4b E, 4a LOU a1 r '1 3a 250 I 2b 2a I 720 I I b la I I I I I I I I 200 300 400 500 600 700 800 900 Tern peratu re/"C Fig. 9. Absorbance versus temperature curves for cadmium chloride using (a) cold vapour detection and (b) flame atomic absor tion detection. Conditions as in Fig. 8, but fast heating. 1, CdC12; 2, &C12 + ASC; 3, CdCI2 + MgC12; 4, CdC12 + MgC12 + ASC Table 2. Initial temperature of vaporisation obtained using electrographite and pyrolytic graphite sample holders. Conditions for measurements (except where indicated in footnotes): aqueous solutions; argon atmosphere with 0.01 vol.-O/~ of 02; heating rate 0.8 "C s-1; flame atomic absorption detection TJ"C Electro- Pyrolytic Sample* graphite graphite Ascorbicacid(ASC) .. . . . . 3201 220$ MgC12 (40) Cd(N03)2 + ASC (5 + 250) . . . . 310; 580 300; 450 . . . . . . . . 620 580 600 Cd(N03)2 (5) . . . . . . . . 580 CdCI2 (5) . . . . . . . . . . 370; 600 340 CdC12 + A X (5 + 250) . . . . . . 320;550;700 330 CdC12 + MgC12 (5 + 5) . . . . . . 370;650 350 Cd(N03)2 + MgC12 (5 + 12) . . . . 380;650 340 CdC12 + MgC12 + ASC (5 + 5 + 250) . . . . . . . . . . . . 320;600 340;480 * Values in parentheses are amounts of Mg, Cd or ASC, t Aqueous solution of 3 mg of ASC, fast heating, flow cuvette. $ Solid 10 mg of ASC, slow heating (0.8 "C s-l), flow cuvette.§ Solid 2-mg sample. CdO(s)$ . . . . . . . . . . . . 630 720 respectively, in pg. volatilisation peaks, the evolution of CdCl,(g) (curves 1 and 2) and that of Cd(g) (curves 2 and 4) is observed over broader temperature ranges than with the use of slow heating conditions (Fig. 8). It can also be seen that when ASC is added the areas of the peaks are much smaller with the cold vapour detection method (curves 2 and 4). This again can be explained by the adsorption of atomic cadmium vapour on the aggregate particles formed from ASC under fast heating conditions. This effect is more significant with the use of a pyrolytic (Fig. 9) than with an electrographite sample holder (Fig. 6 ) . Some of the initial temperature of vaporisation data obtained with the use of graphite sample holders are sum- marised in Table 2.Conclusions Conventional electrothermal atomisers use heating rates that are several orders of magnitude higher than those used with the quartz furnace applied in this work. An additional difference is that the mass of analyte measured in this study is several orders of magnitude higher than that in ordinary ETA measurement. The additives (possible sample matrices) applied in this work were, however, in the same mass range (5-250 pg) that is often applied in electrothermal atomisers. Obviously, these factors should be considered if the results obtained with the quartz furnace are used to interpret the processes taking place in electrothermal atomisers. Owing to the partial hydrolysis of cadmium chloride a double vaporisation peak was obtained (Fig.7, curve lb) that was similar in this respect to that reported previously when zinc chloride6 and magnesium chloride7 were investigated under slow heating conditions. The results obtained for zinc chloride can be compared with those of Yanagisawa et aZ.,35 who applied an extremely high heating rate (about 7 X 104 "C s-1) using a combination of a tungsten filament vaporiser and a low-pressure microwave-induced plasma. The emission signals were monitored with a storage oscilloscope.3~ By increasing the mass (0.0154.15 ng of Zn) of zinc chloride in a 0.001 M acidic solution, a single peak was observed. However, with a further increase in the sample mass (0.5 ng or higher), an additional, lower temperature peak also appeared, the height of which increased much more rapidly with increasing analyte mass than a linear relationship would give.This result is identical in essence with that obtained by us for zinc chloride6 and magnesium chloride ,7 with the difference that Yanagisawa et aZ.35 observed this phenomenon with a sample mass several orders of magnitude lower. Under the conditions described,35 double vaporisation peaks were also observed with zinc nitrate (5 ng of Zn), which cannot be explained by the partial hydrolysis of this salt. We also observed the double curves when using a relatively high mass of solid Cd(N03)2.4H20 with slow heating (see above). It turned out, however, that the low-temperature peak was due to the blowing effect of the nitrogen oxide gases evolved rapidly from cadmium nitrate.This can also happen with other nitrate salts, provided that the sample is not trapped in the pores of the sample holder. Based on the examples given above, it is clear that when using a higher heating rate similar evolution patterns may be observed with a small sample mass to those obtained with a high sample mass using a low heating rate. Campbell and Ottawaylo reported a four-fold decrease in the cadmium signal in the presence of 5 pg of Mg (MgC12) when applying a commercial graphite tube atomiser. Using slow heating of the dried (100 "C) residue of a diluted (1 + 1) sea-water sample, a single atomisation peak was obtained. In contrast, we obtained a double vaporisation peak in the presence of MgC12 (5 pg of Mg) when using flame atomisation and an electrographite sample holder (Fig.7, curve 3b). (In the work cited,lO the quality of the graphite tube was not mentioned, which probably means that a graphite tube without a pyrolytic coating was used.) It must be concluded that the fraction of cadmium evolved as CdC12(g) at a lower temperature was not dissociated in the graphite tube atomiser and could not be detected. Using an extremely high heating rate,l9 it is likely that the temperature of the gas within the graphite tube reaches a value at which the dissociation of metal chloride molecules occurs to a significant extent before they leave the tube. However, under such conditions a larger amount of MgC12(g) is also formed, as a shorter time isJOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL.1 17 available for hydrolysis to occur in the condensed phase. As a result, the chlorine species formed from the partial dissocia- tion of MgClz(g) decreases the dissociation of CdC12(g). By applying a platform sample holder9J5 or constant- temperature furnace,l6 the gas temperature inside the furnace is increased above the vaporisation temperature, so the gas-phase dissociation can be enhanced, resulting in a decrease in halide interference effects. According to our observations, “drying” at temperatures up to 130 “C using a step mode of heating is often not sufficient to drive out the hydrochloric acid formed by hydrolysis froml0- 20 pg salt matrices. However, if slow heating is applied, as much as 100 pg of Mg (MgC12) can hydrolyse completely in the aqueous solution when heated up to 300 “C.The large mass of non-hydrolysing NaCl present together with MgC12 in sea water may hinder the hydrolysis of MgC12. With such samples, NH4N03 or HN03 matrix modifiers have proved to be effective for the decomposition of the halide salts during the pre-heating stage.9 The vaporisation temperature of cadmium could be increased by the addition of (NH4)2HP04 or NH4H2P04 matrix modifiers.9330 However, the vaporisation temperature of cadmium (i.e., the permissible char temperat- ure) changed with the sea water to additive ratio.9.30 It follows that the relative concentrations of the matrix components and additives and the rate and time of pre-heating are critical factors in determining the magnitude of interference effects.The question9 of why increasing amounts of alkali and alkaline earth metals reduce the temperature at which char losses begin to appear can probably be answered by studying the thermal behaviour of the sample matrices and additives. For this purpose, combined spectroscopic sources seem to be more suitable than electrothermal atomisers, as demonstrated in this and previous investigations.7 It has been shown here that in the presence of ASC, Cd(1) is formed from CdC12 during heating on a pyrolytic graphite surface, which results in low-temperature evolution of Cd(g). MgC12 also reacts with ASC and less volatile MgO(s) is produced by thermal decomposition. These processes have been utilised to separate the atomic absorption signal of cadmium with time from the background signal of the matrix .I2 The aggregates (aerosol particles) formed from the ASC adsorb a fraction of the cadmium vapour.However, by applying a heating rate of 1000-2000 “C s-1 in the atomisation stage, which is readily available with commercial graphite atomisers, the aggregates will probably be decomposed before leaving the tube and therefore no decrease of the cadmium signal is expected. This was actually found in practice.12 Our experimental results support the assumption of L’vov and Ryabchuk32 that the vaporisation of CdO(s) formed from an aqueous solution of cadmium salts takes place by thermal dissociation in an atmosphere with a low oxygen content. We found that an increase in the oxygen concentration in the furnace gas increases the vaporisation temperature with both platinum and graphite sample holders, which is to be expected according to this vaporisation mechanism.However, when using graphite sample holders the initial observation tempera- ture of vaporisation was always lower than that with a platinum sample holder owing to the reaction between graphite and oxygen (the “purification effect of graphite”).32 The mechanism of oxygen scavenging and its consequences for the thermal dissociation of several metal oxides (including cadmium oxide) have been explained in detai1.32.33 The authors express their gratitude to their colleagues Jeno Paulik and Miklos Arnold for their most valuable contribu- tions in designing the gas purifier and to Vladislav Izvekov for the molecular spectrophotometric measurements.They are also grateful to Mr. Bruno Hutsch (Ringsdorff-Werke, Bonn-Bad Godesberg, FRG) who was kind enough to provide the solid pyrolytic graphite platforms. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. References Van Loon, J. C., Spectrochim. Acta, Part B, 1983, 38, 1509. Prack, E. R., and Batiaans, G. J., Anal. Chem., 1983,55,1654. Hanamura, S., Smith, B. W., and Winefordner, J. D., Anal. Chem., 1983,55, 2026. Kintor, T., Bezur, L., Sztatisz, J., and Pungor, E.,J. Thermal Anal., 1981, 22, 179. Simon, J., Kintor, T., Kozma, T., and Pungor, E., J. Thermal Anal., 1982, 25, 57. Kintor, T., Bezur, L., Sztatisz, J., and Pungor, E., Talunta, 1979, 26, 357. Kintor, T., Bezur, L., Pungor, E., and Winefordner, J. D., Spectrochim. Acta, Part B, 1983, 38, 581. Kintor, T., Spectrochim. Acta, Part B , 1983, 38, 1483. Slavin, W., Manning, D. C., Carnrick, G., and Pruszkowska, E., Spectrochim. Acta, Part B , 1983, 38, 1157. Campbell, W. C., and Ottaway, J. M., Analyst, 1977,102,495. Tominaga, M., and Umezaki, Y., Anal. Chim. Acta, 1982,139, 279. Hoenig, M., and Wollast, R., Spectrochim. Acta, Part B , 1982, 37, 399. Yasuda, S., and Kakiyama, H., Anal. Chim. Acta, 1977, 89, 369. Matsusaki, K., Anal. Chim. Acta, 1982, 141, 233. Kaiser, M. L., Koirtyohann, S. R., and Hinderberger, E. J., Spectrochim. Acta, Part B , 1981, 36, 773. Lawson, S. R., Nichols, J. A., Viswanadham, P . , and Woodriff, R., Appl. Spectrosc., 1982, 36, 357. Sturgeon, R. E., Chakrabarti, C. L., and Langford, C. H., Anal. Chem., 1976, 48, 1792. Czobik, E. J., and Matousek, J. P., Talanta, 1977, 24, 573. Chakrabarti, C. L., Wan, C. C., Teskey, R. J., Chang, S. B., Hamed, H. A., and Bertels, P. C., Spectrochim. Acta, Part B, 1981,36, 427. Salmon, S. G., and Holcombe, J. A., Anal. Chem., 1982, 54, 630. Gegus, E., Kreiter, J., Meray, L., and InczCdy, J., Acta Chim. Acad. Sci. Hung., 1979, 101, 347. Robinson, J. W., and Weiss, S . , Spectrosc. Lett., 1980, 13,685. Aziz, A., Broekaert, J. A. C., and Leis, F., Spectrochim. Acta, Part B, 1982, 37, 369. Crabi, G., Cavalli, P., Achilli, M., Rossi, G., and Omenetto, N., At. Spectrosc., 1982, 3, 81. Kintor, T., Bezur, L., and Pungor, E., Mikrochim. Acta, 1981, I, 289. Petzold, D., and Naumann, R., J. Thermal Anal., 1980,19,25. Lipatov, S. M., “Physical Chemistry of Colloids” (in Hun- garian), AkadCmiai Kiad6, Budapest, 1951. Hassler, J. W., “Purification with Activated Carbon,” Chem- ical Publishing Co., New York, 1974. Kintor, T., Grif, E. H., Nagy, B. H., and Pungor, E., Hung. Sci. Instrum., 1980, 50, 9. Slavin, W., Carnrick, G. R., and Manning, D. C., Anal. Chem., 1984, 56, 163. Liptay, G., Editor, “Atlas of Thermoanalytical Curves, Cumu- lative Index,” AkadCmiai Kiado, Budapest, 1977. L’vov, B. V., and Ryabchuk, G. N., Spectrochim. Acta, Part B , 1982, 37, 673. Sturgeon, R. E., Siu, K. W. M., and Berman, S . S., Spectrochim. Acta, Part B, 1984, 39, 213. Menden, E. E., Elia, V. J., Michel, L. W., and Petering, H. G., Environ. Sci. Technol., 1972, 6 , 830. Yanagisawa, M., Kawaguchi, H., and Vallee, B. L., AnaL Biochem., 1979,95, 8. Paper J5l4 Received May 28th, 1985 Accepted August 23rd, 1985

ISSN:0267-9477    

DOI:10.1039/JA9860100009

出版商:RSC    

年代:1986

数据来源: RSC

摘要:

18R JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL. 1 Glossary of Abbreviations Whenever suitable, elements may be referred to by their chemical symbols and compounds by their formulae. The following abbreviations are used extensively in the Atomic Spectrometry Updates. a.c. AA AAS AE AES AF AFS APDC ASV CMP CRM cw d.c. DCP DMF DNA EDL EDTA ETA FAAS FAES FAFS FI GC GDL HCL h.f. HPLC IBMK alternating current atomic absorption atomic absorption spectrometry atomic emission atomic emission spectrometry atomic fluorescence atomic fluorescence spectrometry ammonium pyrrolidinedithiocarbamate (ammonium tetramethylenedithio- carbamate) anodic-stripping voltammetry capacitively coupled microwave plasma certified reference material continuous wave direct current d.c.plasma N, N-dimethylformamide deoxyribonucleic acid electrodeless discharge lamp et hylenediaminetetraacetic acid electrothermal atomisation flame AAS flame AES flame AFS flow injection gas chromatography glow discharge lamp hollow-cathode lamp high-frequency high-performance liquid chromatography isobutyl methyl ketone (4-methylpentan- 2-one) ICP IR LC LTE MECA MIP MS NAA NaDDC NTA OES PMT p.p. b. p.p.m. PTFE r.f. REE RM RSD SBR SEM SNR SSMS TCA TLC TOP0 u.h.f. uv VDU vuv XRF inductively coupled plasma infrared liquid chromatography local thermal equilibrium molecular emission cavity analysis microwave-induced plasma mass spectrometry neutron-activation analysis sodium diethyldithiocarbamate nitrilotriacetic acid optical emission spectrometry photomultiplier tube parts per billion parts per million polytetrafluoroethylene radiofrequency rare earth element reference material relative standard deviation signal to background ratio scanning electron microscopy signal to noise ratio spark-source mass spectrometry trichloroacetic acid thin-layer chromatography trioctylphosphine oxide ultra-high-frequency ultraviolet visual display unit vacuum ultraviolet X-ray fluorescence

ISSN:0267-9477    

DOI:10.1039/JA986010018R

出版商:RSC    

年代:1986

数据来源: RSC

摘要:

JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL. 1 19R 8611. 8612. 8613. 8614. 8615, 8616. 8617. 8618. 8619. 86/10. 8611 1. 86/12. 86/13. 86/14. ATOMIC SPECTROMETRY UPDATE REFERENCES The address given in a reference is that of the first named author and is not necessarily the same for any co-author. Kindstedt, P. S., Kosikowski, F. V., Improved complexometric determination of calcium in cheese, J . Dairy Sci., 1985,68, 806 . (Dept. Food Sci., Cornell Univ., Ithaca, NY 14853, USA). Winston, A., Varaprasad, D. V. P. R., Metterville, J. J., Rosenkrantz, H., Evaluation of polymeric hydroxamic acid iron chelators for treatment of iron overload, J . Pharmacol. Exp. Ther., 1985 232, 644. (Dept. Chem., West Virginia Univ., Morgantown, WV, USA). Saner, G., Dagoglu, T., Ozden, T., Hair manganese concentrations in newborns and their mothers, A m .1. Clin. Nutr., 1985, 41, 1042. (Dept. Pediatr., Univ. Instanbul, Instanbul, Turkey). Zbiral, J., Stana, J., Determination of calcium in mineralised plants, Agrochemia (Bratislava), 1985, 25(4), 126. (Ustred. Kontrolni Zkusebni Ustav Zemed., Prague, Czechoslovakia). Daci, N. M., Hoxha, E. M., Vujicic, G., Trace metal contents of acidic, basic and neutral components of a cyclohexanol extract of Kosova Basin lignite, Fuel, 1985, 64, 520. (Dept. Chem., Univ. Kosova, 38000 Prishtine, Yugoslavia). Jin, Q., Zhang, H., Yu, A., Tang, Y., Determination of mercury in air by normal-pressure microwave inductively coupled plasma spectrometry, Guangpuxue Yu Guangpu Fenxi, 1985, 5(1), 36. (Dept.Chem., Jilin Univ., Changchun, China). Javellana, M., Jawed, I., Appler, D., Analysis of fuel ash using ICP-AES, A m . Lab. (Fairfield, Conn.), 1985, 17(3), 28. (Anal. Dept., Martin Marietta Lab., USA). Kulebakina, L. G., Kozlova, S. I., Distribution of dissolved and particulate forms of mercury in the 0-100 m layer in the Atlantic Ocean and Mediterranean Sea, Okeanologiya (Moscow), 1985, 25, 248. (Inst. Biol. Yuzhn. Morei im. Kovalevskogo, Sevastopol, USSR). Floyd, M. A., Halouma, A. A., Morrow, R. W., Farrar, R. B., Rapid multi-element analysis of water samples by sequential ICP-AES, Am. Lab. (Fairfield, Conn.), 1985, 17(3), 84. (Oak Ridge Gaseous Diffusion Plant, Martin Marietta Energy Syst., Inc., USA). Schindler, E., Determination of silver. aluminium, arsenic, cadmium, chromium, copper, iron, manganese, lead, selenium and zinc in drinking water. Instructions for examining drinking water by graphite tube AAS, Dfsch.Lebensm.-Rundsch., 1985,81(2), 35. (Oberrat Bundesanst. Lebensmittelunters., A-8010 Graz, Austria). Montgomery, J. R., Hucks, M., Peterson, G. N., A portable non-contaminating sampling system for iron and manganese in sediment pore water, Flu. Sci., 1985, 48, 46. (Harbor Branch Found., Inc., Fort Pierce, FL 33450, USA). Xu, B., Xu, T., Shen, M., Fang, Y., Indirect determination of trace phenol in water by atomic absorption spectrophotometry, Talanfu, 1985, 32,215. (Dept. Chem., East China Normal Univ., Shanghai, China). Statham, P. J., The determination of dissolved manganese and cadmium in sea water at low nmol I- 1 concentrations by chelation and extraction followed by electrothermal atomic absorption spectrometry, Anal.Chim. Acfu, 1985,169,149. (Dept. Oceanogr., Univ. Southampton, Southampton SO9 5NH, UK). Tye, C. T., Haswell, S. J., O’Neill, P., Bancroft, K. C. C., High-performance liquid chromatography with hydride generation atomic absorption spectrometry for the determination of arsenic species with application to some water samples, Anal. Chim. Acta, 1985, 169, 195. (John Graymore Chem. Lab., Dept. Environ. Sci., Plymouth Polytech., Drake Circus, Plymouth PL4 8AA, UK). 86/15. 86/16. 86/17. 86/18. 86/19. 86/20. 8612 1. 86/22. 86/23. 86/24. 86/25. 86/26. 86/27. 86/28. Fu, H., Zheng, S., Time-resolved spectra of the aluminium spark discharge, Guangpuxue Y u Guangpu Fenxi, 1985, 5(2), 1.(Dept. Phys., Yunnan Univ., Kunming, China). Pelizzetti, E., Pramauro, E., Analytical applications of organised molecular assemblies, Anal. Chim. Acta, 1985, 169, 1. (Inst. Chim. Anal., Univ. Torino, Torino 10125, Italy). Cresser, M. S., O’Grady, C. E., Marr, I. L., A critical appraisal of shortcuts in flame spectroscopy, Prog. Anal. At. Spectrosc., 1985,8, 19. (Dept. Chem., Aberdeen Univ., Meston Walk, Old Aberdeen AB9 2UE, UK). De Loos-Vollebregt, M. T. C., De Galan, L., Zeeman atomic absorption spectrometry, Prog. Anal. At. Spectrosc., 1985, 8, 47. (Lab. Anal. Scheikd., Tech. Hogesch. Delft, 2628 BX Delft, The Netherlands). Eckert, H. U., A check on the continuity of analyte transport in the chemical ICP torch, Spectrochim. Acta, Part B , 1985, 40, 145.(Palos Verdes Estates, CA 90274, USA). Meyer, G. A., Thompson, M. D., Determination of trace element detection limits in air and oxygen inductively coupled plasmas, Spectrochim. Acta, Part B , 1985,40, 195. (Michigan Appl. Sci. Technol. Lab., Dow Chem. USA, Midland, MI 48640, USA). Wittmann, A. A., Willay, G. M. H., Automatic non-metallic sample preparation for inductively coupled plasma spectrometry, Spectrochim. Acta, Part B , 1985,40, 253. (French Iron and Steel Research Inst., F 57210 Maizeres-les-Metz, France). Deutsch, R. D., Hieftje, G. M., Development of a microwave-induced nitrogen discharge at atmospheric pressure (MINDAP), Appl. Spectrosc., 1985, 39, 214. (Dept. Chem., Indiana Univ., Bloomington, IN 47405, USA). Arpadjan, S., Chadjiivanov, K., Tsalev, D., Method for optimising flame atomic absorption processes, Specfrochi.+. Acta, Part B , 1985,40, 697. (Fac. Chem., Univ. Sofia, 1126 Sofia, Bulgaria). Lancione, R. L., Drew, D. M., Evaluation of ICP atomic fluorescence for the determination of mercury, Spectrochim. Actu, Part B , 1985, 40, 107. (Baird Corp., Bedford, MA 01730, USA). Nakahara, T., Determination of phosphorus in steels and copper metals by vacuum ultraviolet atomic emission spectrometry with inductively coupled plasma, Spectrochim. Acta, Part B , 1985,40,293. (Coll. Eng., Univ. Osaka Prefect., Sakai 591, Japan). Lin, J. L., Satake, M., Puri, B. K., Atomic absorption spectrometric determination of copper(1) after separation by adsorption of its 3-(2-pyridyl)-5,6-diphenyl-l,2,4- triazine tetraphenylborate ion-associate complex on mic- rocrystalline naphthalene, Analusis, 1985, 13(3), 141.(Dept. Chem., Natl. Taiwan Coll. Educ., Changhua, Taiwan). Batistoni, D. A., Smichowski, P. N., Atomic absorption determination of titanium and vanadium in uranium concentrates, Appl. Spectrosc., 1985, 39, 222. (Dept. Quim., Com. Nac. Energ. At., 8250 1429 Buenos Aires, Argentina). Zhang, Y. K., Hanamura, S., Winefordner, J. D., Evaluation of microwave induced air plasma as an excitation source, Appl. Spectrosc., 1985, 39, 226. (Dept. Chem., Univ. Florida, Gainesville, FL 32611 , USA).20R 86/29. 86/30. 8613 1. 86/32. 86/33. 86/34. 86/35. 86/36. 86/37. 86/38. 86/39. 86/40. 86/41. 86/42. JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL.1 Meneshian, M. A,, Tsao, K. Y., Waggener, H. A., Low level impurity measurement in sputtered dielectric films using the atomic absorption spectrophotometer, Proc. Electrochem. SOC., 1985, 85, 237. (AT and T Teletype Corp., Skokie, IL 60077, USA). Wang, J., Han, P., Fan, B., Determination of gold and palladium in ores by atomic absorption spectrophotometry using tri-n-octylamine loaded with polyurethane foam, Fenxi Huaxue, 1985, 13, 101. (Chengdu Coll. Geol., Chengdu, China). Chen, D., Wang, C., Li, A., Bi, S., Indirect determination of trace sulphide by cold vapour atomic fluorescence spectrometry, Fenxi Huaxue, 1985, 13, 119. (Dept. Chem. Nanjing Univ., Nanjing, China). Wang, S., Bai, L., Wang, J., Zhou, G., Lin, X., Wang, Y., Determination of microamount impurities of copper, lead, cadmium and iron in high-purity zinc by emission spectroscopy, Fenxi Huaxue, 1985, 13, 136.(Changchun Inst. Appl. Chem., Acad. Sin., Changchun, China). Gao, C., Zhang, B., Hu, S., Rapid determination of major components in silicate rocks-decomposition by fusion with lithium metaborate and determination by atomic absorption spectrophotometry, Fenxi Huaxue, 1985, 13, 139. (Northwest Inst. Nucl. Technol., China). Nagahiro, T., Uesugi, K., Satake, M., Puri, B. K., Atomic absorption spectrophotometric determination of copper(1) after extraction of its ternary complex with 3-(4-phenyl-2-pyridyl)-5,6-diphenyl-1,2,4-triazine and tetraphenylborate into molten naphthalene, Bull. Chem. SOC. Jpn., 1985, 58, 1115. (Dept. Chem., Himeji Inst. Technol., Himeji 671-22, Japan).Dittrich, K., Mothes, W., Yudelevich, I. G., Papina, T. S., Investigations of trace analysis of AIIIBV semiconductor microsamples by atomic spectroscopy-VII. Investigation of trace and thin-layer analysis of doping elements (Ag, Au, Bi, Cd, Sn, T1) in indium arsenide by atomic absorption with electrothermal evaporation, Talanta, 1985, 32, 195. (Anal. Cent., Karl-Marx Univ., DDR 7010 Leipzig, GDR). Ishida, K., Puri, B. K., Satake, M., Mehra, M. C., Determination of bismuth by flame atomic absorption spectrometry after separation by adsorption of its 2-mercaptobenzothiazole complex on microcrystalline naphthalene, Talanta, 1985, 32, 207. (Fac. Eng., Fukui Univ., Fukui 910, Japan). Milosavljevic, E. B., RGiiZka, J., Hansen, E. H., Simultaneous determination of free and EDTA-complexed copper ions by flame atomic absorption spectrometry with an ion-exchange flow injection system, Anal.Chim. Acta, 1985, 169, 321. (Chem. Dept. A, Tech. Univ. Denmark, Lyngby, DK-2800, Denmark). Baranova, L. L., Kaplan, B. Ya., Nazarova, M. G., Razumova, L. S., Spectrochemical analysis of high purity lead, Zavod. Lab., 1985, 51(4), 25. (Gos. Nauchno-Issled. Inst. Redkomet. Prom., Moscow, USSR). Khozhainov, Y. M., Tyurin, 0. A., Deinikina, N. P., Electrothermal atomic absorption determination of silver in cadmium selenide, Zavod. Lab., 1985, 51(4), 30. (Mosk. Khim.-Technol. Inst., Moscow, USSR). Kopylova, L. A., Sryvtseva, T. B., Simkin, E. A., Favinskii, Y. Y., Atomic absorption determination of antimony and arsenic in samples of the copper industry, Zavod.Lab., 1985, 51(4), 32. (Gos. Nauchno-Issled. Inst. Gidrometal. Tsvetn. Met., Novosibirsk, USSR). Zhukova, M. P., Kostina, L. V., Atomic absorption determination of oxides of calcium and magnesium in chromium ores and concentrates, Zavod. Lab., 1985,51(4), 34. (TsNII Chern. Metal., Moscow, USSR). Wang, G., General quantitative spectral analysis of pairs or groups with artificial matrix, Guangpuxue Yu Guangpu Fenxi, 1985,5(2), 55. (Anhui Inst. Chem. Technol., China). 86/43. 86/44. 86/45. 86/46. 86/47. 86/48. 86/49. 86/50. 8615 1. 86/52, 86/53. 86/54. 86/55. 86/56. 86/57. 86/58. Widmer, D. S., Andrews, A. S., Tube cell for atomic absorption spectrophotometry, Eur. Pat. Appl. EP 133 720 (Cl. GOlN21/74), 6 Mar. 1985, GB Appl.83120949, 3 Aug. 1983, 13pp. (Philips Electronic and Associated Industries Ltd., N. V. Philips Gloeilampenfabrieken, The Netherlands). Olsen, K. B., Sklarew, D. S., Evans, J. C., Detection of organomercury , selenium and arsenic compounds by a capillary column gas chromatography - microwave plasma detector system, Spectrochim. Acta, Part B, 1985,40, 357. (Pac. Northwest Lab., Richland, WA 99352, USA). Ibrahim, M., Nisamaneepong, W., Caruso, J., Microcolumn high pressure liquid chromatography with a glass-frit nebuliser interface for plasma emission detection, J . Chromatogr. Sci., 1985,23(4), 144. (Dept. Chem., Univ. Cincinnati, Cincinnati, OH 45221, USA). Subramanian, K. S., Meranger, J. C., Connor, J., Effect of container material, storage time and temperature on determinations of cadmium levels in human urine, Talanta, 1985, 32, 435.(Environ. Health Dir., Health Welfare Canada, Ottawa, ON, Canada). Mauras, Y., Allain, P., Automatic determination of aluminium in biological samples by inductively coupled plasma emission spectrometry, Anal. Chem., 1985, 57, 1706. (Lab. Pharmacol., CHU, 49040 Angers, France). Cary, E. E., Electrothermal atomic absorption spectroscopic determination of chromium in plant tissues: interlaboratory study, J . Assoc. Off. Anal. Chem., 1985,68, 495. (US Plant, Soil Nutr. Lab., Agric. Res. Serv., Ithaca, NY 14853, USA). Isaac, R. A., Johnson, W. C., Elemental analysis of plant tissue by plasma emission spectroscopy: collaborative study, J . Assoc. Off. Anal. Chem., 1985,68,499. (Soil Test. Plant Anal.Lab., Univ. Georgia, Athens, GA 30605, USA). Johnson, D. C., Orlowitz, L., Hitzig, B. M., Differences between CSF and plasma sodium and potassium activities and concentrations, Am. J . Physiol., 1985, 248(5, Pt. 2), R621. (Med. Serv., Massachusetts Gen. Hosp., Boston, MA 02114, USA). Hershey, C. O., Hershey, L. A., Wongmongkolrit, T., Varnes, A. W., Breslau, D., Trace element content of brain in Alzheimer disease and aging, Trace Elem. Med., 1985,2, 40. (Sch. Med., Case West. Reserve Univ., Cleveland, OH 44106, USA). Barbera, R., Farre, R., Montoro, R., Atomic absorption spectrophotometric determination of cobalt in foods, 1. Assoc. Off. Anal. Chem., 1985, 68, 511. (Fac. Pharm., Univ. Valencia, Valencia 46010, Spain). Broske, P., Fast routine method for cadmium determination, LaborPraxis, 1985, 9(3), 152.(Westfael. Met. Ind. K.-G. Hueck und Co., D 4780 Lippstadt, FRG). Zamilova, L. M., Biktimirova, T. G., Sokolova, V. I., Atomic absorption determination of vanadium and nickel in gas-oil fractions of crude oils, Neftekhimiyu, 1985, 25, 159. (Bashk. Nauchno-Issled Inst. Pererab. Nefti, Ufa, USSR). Papp, C. S. E., Harms, T. F., Comparison of digestion methods for total elemental analysis of peat and separation of its organic and inorganic components, Analyst, 1985,110, 237. (US Geol. Surv., Denver, CO 80225, USA). Nonomura, E., Kotani, N., Tokuta, T., Narita, K., Yoshida, Y., Yabata, T., Direct determination of silicon in pig iron melt by emission spectrometry, Tetsu to Hagane, 1985, 71(2), A125. (Kobe Seikosho Co.Ltd., Kobe, Japan). Kadoyama, K., Tanimoto, W., Hisada, H., Asagawa, H., Direct analysis of molten pig iron by laser emission spectrometry, Tetsu to Hugane, 1985, 71(2), A133. (Kawasaki Seitetsu Co. Ltd., Japan). Ono, T., Chiba, K., Saeki, M., Ninbu, T., Kasai, S., On-line analysis of molten steel by emission spectrometry, Tetsu to Hagane, 1985, 71(2), A129. (Shinnippon Seitetsu Co. Ltd., Japan).JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL. 1 21R 86/59. 86/60. 86161. 86162. 86/63. 86/64. 86/65. 86/66. 86/67. 86/68. 86/69. 86/70. 8617 1. 86/72. 86/73. 86/74. Sternowsky, H. J., Wessolowski, R., Lead and cadmium in breast milk. Higher levels in urban versus rural mothers during the first 3 months of lactation, Arch. Toxicol., 1985, 57,41. (Dept.Pediatr., Gen. Hosp., D-3040 Soltau, FRG). Drasch, G., Kauert, G., Von Meyer, L., Cadmium body burden of an occupationally non-burdened population in southern Bavaria (FRG), Znt. Arch. Occup. Environ. Health, 1985,55, 141. (Inst. Rechtsmed., Univ. Muenchen, D-8000 Munich 50, FRG). Oishi, S., Characterisation of sintering furnace dusts in iron industry, Kogai, 1985, 20, 41. (Air Pollut. Control Dept., Natl. Res. Inst. Pollut. Resour., Ibaraki, Japan). Krivan, V., Petrick, K., Welz, B., Melcher, M., Radiotracer error - diagnostic investigation of selenium determination by hydride generation atomic absorption spectrometry involving treatment with hydrogen peroxide and hydrochloric acid, Anal. Chem., 1985,57, 1703. (Sekt. Anal. Hoechstreinigung, Univ. Ulm, D-7900 Ulm, FRG).Chi, X., Tan, M., Zhan, L., Determination of trace chromium(II1) and chromium(V1) in water by APDC - IBMK extraction and atomic absorption spectrometry, Guangpuxue Yu Guangpu Fenxi, 1985,5(2), 40. (Dept. Chem., Beijing Norm. Univ., Beijing, China). Yaneva, S., Gitsova, S., Angelieva, R., Comparison of three methods for cadmium determination in waters, Khig. Zdraveopaz., 1985, 28, 49. (MA, Sofia, Bulgaria). Halls, D. J., Fell, G. S., Determination of aluminium in dialysate fluids by atomic absorption spectrometry with electrothermal atomisation, Analyst, 1985, 110, 243. (Biochem. Dept., Glasgow Royal Infirm., Glasgow G4 OSF, UK). Lautenschlager, W., ICP with echelle grating arrangement, LaborPraxis, 1985,9,473. (AGW Analysengeraete GmbH, 7970 Leutkirch, FRG) .MacDonald, J. C., High-performance liquid chromatography of inorganics and organometallics, Chem. Anal. ( N . Y . ) , 1985,78,285. (Dept. Chem., Fairfield Univ., Fairfield, CT, USA). Goldfarb, V. M., Goldfarb, H. V., ICP-AES analysis of gases in energy technology and influence of molecular additives on argon ICP, Spectrochim. Acta, Part B , 1985, 40, 177. (Avco Everett Res. Lab. Inc., Everett, MA 02149, USA). Marshall, J., Carroll, J., Littlejohn, D., Ottaway, J. M., O’Haver, T.C., Harnly, J. M., Microcomputer controlled background correction for ETA-AES and ETA - continuum source AAS, Anal. Proc., 1985, 22, 67. (Dept. Pure Appl. Chem., Univ. Strathclyde, Glasgow G1 lXL, UK). Katz, E. D., Scott, R. P. W., Peak dispersion in a liquid chromatography - atomic absorption spectrometry system, Analyst, 1985,110,253.(Perkin-Elmer Corp., Norwalk, CT 06856, USA). Uehiro, T., Morita, M., Fuwa, K., Vacuum ultraviolet ionic emission lines of typical Group 13-15 elements for inductively coupled argon plasma emission spectrometry, Anal. Chem., 1985, 57, 1709. (Natl. Inst. Environ. Stud., Yatabe 305, Japan). Thompson, M., Zao, L., Rapid determination of molybdenum in soils, sediments and rocks by solvent extraction with inductively coupled plasma atomic emission spectrometry, Analyst, 1985, 110, 229. (Dept. Geol., Imperial Coll. Sci. Technol., London SW7 2BP, UK). Xian, W., Chen, H., Determination of germanium by hydride generation atomic absorption spectrometry with oxygen-shielded air - acetylene flame, Fenxi Huaxue, 1985, 13, 142.(Shanghai Res. Inst. Iron Steel, Shanghai, China). Wendl, W., Muller-Vogt, G., Chemical reactions of chromium and vanadium in graphite furnace atomic absorption spectrometry, Spectrochim. Acta, Part B , 1985, 40, 527. (Kristall- Materiallabor, Univ. Karlsruhe, D-7500 Karlsruhe, FRG). 86/75. 86/76. 86/77. 86/78. 86/79. 86/80. 86/81. 86/82. 86/83. 86/84. 86/85. 86/86. 86/87. 86/88. 86/89. Sandor, V., Zsuzsanna, B., Analysis of manganese ores and their concomitant rocks with a MOM 190-A atomic absorption spectrophotometer, Magy. Kem. Foly., 1985, 91, 223. (Szervetlen Anal. Kem. Tansz., JATE, 6723 Szeged, Hungary). Danielsson, R., Saikkonen, R., Chemical analysis of USGS-W-2, USGS-DNC-1 and USGS-BIR-1 standard rocks, Tutkimusrap. -Geol. Tutkimuskeskus, 1985, 70, 12pp.(Geol. Surv. Finland, SF-02150 Espoo, Finland). Vidal Gandia, M. T., De la Guardia Cirugeda, M., Use of emulsions in the atomic absorption spectroscopic determination of copper after extraction of organic complexes. Effect of the nature of complexing agents on sensitivity, Analusis, 1985, 13, 233. (Dept. Anal. Chem., Fac. Chem. Sci., Burjasot, Spain). Shimadzu Corp., Flameless atomiser, Jpn. Kokai Tokkyo Koho, JP 60 04 845 [85 04,8451 (CI. GOlN21/74), 11 Jan. 1985, Appl. 831112 564, 22 Jun. 1983, 2pp. Jowitt, R., Abell, I. D., Analysis of materials, Eur. Pat. Appl., EP 135 375 (C1. G01N33/20), 27 Mar. 1985, GB Appl. 83/22 709, 24 Aug. 1983, llpp. (British Steel Corp.). Kenney, G. B., Device and method for in-process, multi-element analysis of molten metal and other liquid materials, Eur.Pat. Appl., EP 135 097 (CI. GOlN33/20), 27 Mar. 1985, US Appl. 522 913, 12 Aug. 1983, 22pp. Zeng, K., Ou, Q., Wang, G., Yu, W., Analysis of oxygenated compounds by gas chromatography - microwave plasma emission spectrometry, Spectrochim. Acta, Part B , 1985, 40, 349. (Lanzhou Inst. Chem. Phys., Acad. Sin., Lanzhou, China). Trussel, F. C., Yonko, T,, Beardsley, J. D., Archer, E. D., Tackett, J. E., Couper, J. R., Tang, S. C., Hewitt, R. W., Wibby, C., Fabec, J. L., Thomas, J., Ringen, S., Watkins, L. V., Romba, G. L., Petroleum, Anal. Chem., 1985, 57, 191R. (Marathon Oil Co., Littleton, CO 80160-0269, USA). Straub, W. A., Hurwitz, J. K., Ferrous analysis, Anal. Chem., 1985, 57, 94R. (Tech. Center, US Steel Corp., Monroeville, PA 15146, USA).McGeorge, S. W., Salin, E. D., Some theoretical and practical considerations to the application of linear photodiode arrays for inductively coupled plasma emission spectrometry, Spectrochim. Acta, Part B , 1985, 40, 435. (Dept. Chem., McGill Univ., 801 Sherbrooke St. W., Montreal, P.Q., H3A 2K6, Canada). Shan, X.-Q., Ni, Z.-M., Yuan, Z.-N., Determination of indium in minerals, river sediments and coal fly ash by electrothermal atomic absorption spectrometry with palladium as a matrix modifier, Anal. Chim. Acta, 1985, 171,269. (Inst. Environ. Chem., Acad. Sinica, PO Box 934, Beijing, China). Ping, L., Fuwa, K., Matsumoto, K., Sensitivity enhancement by palladium addition in the electrothermal atomic absorption spectrometry of mercury, Anal. Chim. Acta, 1985, 171, 279.(Dept. Chem., Fac. Sci., Univ. Tokyo, Hongo, Bunkyo-ku, Tokyo 113, Japan). Wilson, D. A., Yuen, A. M., Hieftje, G. M., Comparison of the helium - oxygen - acetylene and air - acetylene flames as atom sources for continuum-source atomic fluorescence spectrometry, Anal. Chim. Acta, 1985, 171, 241. (Dept. Chem., Indiana Univ., Bloomington, IN 47405, USA). Van Der Veen, N. G., Keukens, H. J., Vos, G., Comparison of ten digestion procedures for the determination of arsenic in soils by hydride generation atomic absorption spectrometry, Anal. Chim. Acta, 1985,171,285. (State Inst. Quality Control Agric. Products, PO Box 230, 6700 AE Wageningen, The Netherlands). Araujo, M. C. U., Pasquini, C., Bruns, R. E., Zagatto, E. A. G., A fast procedure for standard additions in flow injection analysis, Anal.Chim. Acta, 1985, 171,337. (Inst. Quimica, Universidade Estadual de Campinas, CP 1170, 13100 Campinas, SP, Brazil).22R 86/90. 8619 1. 86/92. 86/93. 86194. 86195. 86/96. 86197. 86/98. 86/99. 861100. 861101. 861102. JOURNAL OF ANALYTICAL Martinez-Jemenez, P., Gallego, M., Valcarcel, N., Indirect atomic absorption determination of uranium by flow injection analysis using an air - acetylene flame, At. Spec- trosc. , 198.5, 6, 65. (Dept. Anal. Chem., Fac. Sci., Univ. Cordoba, Cordoba, Spain). Hocquellet, P., Direct determination of tin at ultratrace levels in edible oils and fats by atomic absorption spectrometry with electrothermal atomisation, At. Spectrosc., 1985,6, 69. (Inst. Municipal de Recherches sur I’ Alimentation, Humaine et Animale, Laboratoire Municipal, Rue du Professeur Vkzes, 33300 Bordeaux, France).Marabini, A. M., Barbaro, M., Passariello, B., Determination of uranium in rocks and minerals by plasma emission spectroscopy, At. Spectrosc., 1985, 6, 74. (Consiglio Nazionale delle Ricerche, Istituto per il Trattamento dei Minerali, Via Bolognola, 7 00138 Rome, Italy). Riley, K. W., A simple method for determining mercury in fly ash using the cold vapour - amalgam technique, At. Spectrosc., 1985,6, 76. (CSIRO, Div. Fossil Fuels, PO Box 136, North Ryde, NSW 2113, Australia). Hahn, R., Ikramuddin, M., A new method for the determination of gold in natural waters by electrothermal atomic absorption spectrophotometry, At. Spectrosc. , 1985, 6, 77. (Geochem. Lab., Dept.Geol., Eastern Washington Univ., Cheney, WA 99004, USA). Swovick, M., Detection of manganese in gunshot residue, At. Spectrosc., 1985, 6, 79. (Oakland County Sheriff‘s Dept., 1201 North Telegraph Road, Pontiac, MI 48053, USA). Rojas de Olivares, D., On the standardisation of ruthenium solutions, At. Spectrosc., 1985, 6, 47. (Universidad de Los Andes, Facultad de Ciencias, Departamento de Quimica, Laboratorio Espectroscopia Analitica, Merida 5101, Venezuela). Gunter, W., Visser, K., Zeeman, P. B., Ionisation interferences under various operating conditions in a 9, 27 and 50 MHz ICP, and a study of shifts in level populations of calcium through simultaneous absorption - emission measurements in a 9 MHz ICP, Spectrochim. Acta, Part B , 1985, 40, 617. (Dept. Phys., Univ.Stellenbosch, Stellenbosch 7600, South Africa). Bengtson, A., A contribution to the solution of the problem of quantification in surface analysis work using glow discharge atomic emission spectroscopy, Spectrochim. Acta, Part B , 1985, 40, 631. (Swedish Inst. Metals Res., Drottning Kristinas vag 48, S-114 28 Stockholm, Sweden). Moussounda, P. S., Ranson, P., Mermet, J. M., Spatially resolved spectroscopic diagnostics of an argon MIP produced by surface wave propagation (Surfatron), Spectrochim. Acta, Part B , 1985, 40, 641. (Groupe de Recherche sur I’EnergCtique des Milieux IonisCs, ERA-907, UniversitC d’OrEans, 45046 OrlCans, France). Freeman, J. E., Hieftje, G. M., Near-infrared non-metal atomic emission from a helium microwave-induced plasma: element ratio determinations, Spectrochim.Acta, Part B , 1985,40,653. (Dept. Chem., Indiana Univ., Bloomington, IN 47405, USA). Cremers, D. A., Archuleta, F. L., Martinez, R. J., Evaluation of the continuous optical discharge for spectrochemical analysis, Spectrochim. Acta, Part B , 1985, 40, 665. (Univ. California, Los Alamos Natl. Lab., Chem. Div., Los Alamos, NM 87545, USA). Botto, R. I., Method for correcting for acid and salt matrix interferences in ICP-AES, Spectrochim. Acta, Part B , 1985, 40, 397. (Anal. Res. Lab., Baytown Res. and Develop. Div., EXXON Res. and Engineering Co., PO Box 4255, Baytown, TX 77522, USA). 861103. 861104. 861105. 861106. 861107. 861108. 861109. 8611 10. 8611 11. 861112. 861113. 861114. 86015. ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL. 1 Hagen, D.F., Marhevka, J. S., Haddad, L. C., Multi-element taggant and dual homolog derivatisation concepts in GC-MED, Spectrochim. Acta, Part B , 1985,40, 335. (3M-3M Center, PO Box 33221, St. Paul, MN 55133, USA). Stephens, R., GHz modulation of a hollow cathode lamp, Spectrochim. Acta, Part B, 1985,40,681. (Trace Anal. Res. Centre, Dept. Chem., Dalhousie Univ., Halifax, Nova Scotia B3H 453, Canada). Miller, M., Keating, E., Eastwood, D., Hendrick, M. S., Measured and modelled enhancement of transition metal emissions in the d.c. plasma jet, Spectrochim. Acta, Part B , 1985, 40, 593. (Dept. Mechanical Engineering, US Naval Acad., Annapolis, MD 21402, USA). Blades, M. W., Caughlin, B. L., Excitation temperature and electron density in the inductively coupled plasma-aqueous vs.organic solvent introduction, Spectrochim. Acta, Part B , 1985, 40, 579. (Dept. Chem., Univ. British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Y6, Canada). Doidge, P. S., Aspects of the pyrometric measurement of graphite furnace temperature, Spectrochim. Acta, Part B , 1985, 40, 569. (Varian Techtron Pty Ltd., PO Box 222, Springvale, Victoria 3171 , Australia). Long, S. E., Snook, R. D., Browner, R. F., Some observations on electrothermal vaporisation for sample introduction into the inductively coupled plasma, Spectrochim. Acta, Part B , 1985, 40, 553. (Dept. Chem., Imperial Coll. Sci. Technol., London SW7 2AY, UK). Faires, L. M., Palmer, B. A., Engleman, R., Jr., Niemczyk, T. M., ICP argon emission in the near infrared 1-2 pm by high resolution Fourier transform spectrometry, Spectro- chim.Acta, Part B , 1985, 40, 545. (Anal. Chem. Group, Chem. Div., Los Alamos Natl. Lab., Los Alamos, NM 87545, USA). Faires, L. M., Palmer, B. Y., Brault, J. W., Line width and line shape analysis in the inductively coupled plasma by high resolution Fourier transform spectrometry, Spectrochim. Acta, Part B , 1985, 40, 135. (Anal. Chem. Group, Chem. Div., Los Alamos Natl. Lab., Los Alamos, NM 87545, USA). Rezaaiyaan, R., Olesik, J. W., Hieftje, G. M., Interferences in a low-flow, low-power inductively coupled plasma, Spectrochim. Acta, Part B , 1985, 40, 73. (Dept. Chem., Indiana Univ., Bloomington, IN 47405, USA). Jones, J. W., O’Haver, T. C., Effects of pH and digestion conditions on Chelex 100 separation of trace elements from tissue prior to ICP-AES determination, Spectrochim.Acta, Part B, 1985,40,263. (Div. Chem. Technol., US Food and Drug Admin., 200 C St., S.W., Washington, DC 20204, USA). Furuta, N., Nojiri, Y., Fuwa, K., Spatial profile measurement of electron number densities and analyte line intensities in an inductively coupled plasma, Spectrochim. Acta, Part B , 1985,40, 423. (Div. Chem. Phys., Natl. Inst. Environmental Studies, 16-2, Onogawa, Yatabe, Tsukuba, Ibaraki 305, Japan). McGeorge, S. W., Salin, E. D., Signal-to-noise considerations for rapid scan atomic spectrometry with an inductively coupled plasma, Spectrochim. Acta, Part B , 1985, 40, 447. (Dept. Chem., McGill Univ., 801 Sherbrooke St. W., Montreal, P.Q., H3A 2K6, Canada). Date, A. R., Gray, A. L., Determination of trace elements in geological samples by inductively coupled plasma source mass spectrometry, Spectrochim.Acta, Part B , 1985, 40, 115. (British Geological Survey, 64 Gray’s Inn Road, London WClX 8NG, UK).JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL. 1 23R 86/116. 86/117. 86/118. 86/119. 861120. 86/121. 86/122. 86/123. 861124. Manning, D. C., Slavin, W., Factors influencing the atomisation of vanadium in graphite furnace AAS, Spectrochim. Acta, Part B , 1985, 40, 461. (Perkin-Elmer Corp., Ridgefield, CT 06877, USA). Freeman, J. E., Hieftje, G. M., Analytical characteristics of near-infrared non-metal atomic emission from a helium microwave-induced plasma, Spectrochim. Acta, Part B , 1985,40, 475. (Dept. Chem., Indiana Univ., Bloomington, IN 47405, USA).Michlewicz, K. G., Urh, J. J., Carnahan, J. W., A microwave-induced plasma system for the maintenance of moderate power plasmas of helium, argon, nitrogen and air, Spectrochim. Acta, Part B , 1985, 40, 493. (Dept. Chem., Northern Illinois Univ., DeKalb, IL 60115, USA). Agterdenbos, J., van Noort, J. P. M., Peters, F. F., Bax, D., Ter Heege, J. P., The determination of selenium with hydride generation AAS-I. Description of the apparatus used and study of the reactions in the absorption cuvette, Spectrochim. Acta, Part B , 1985, 40, 501. (Analytisch Chemisch Laboratorium der Rij ksuniversiteit, Croesestraat 77A, 3522 AD Utrecht, The Netherlands). Radziemski, L. J., Cremers, D. A., Niemczyk, T. M., Measurement of the properties of a C02 laser induced air plasma by double floating probe and spectroscopic tech- niques, Spectrochim.Acta, Part B , 1985, 40, 517. (Applied Laser Optics Group, Phys. Dept., PO Box 3D, New Mexico State Univ., Las Cruces, NM 88003, USA). Falk, H., Glismann, A., Bergann, L., Minkwitz, G., Schubert, M., Skole, J., Time-dependent temperature distribution of graphite-tube atomisers, Spectrochim. Acta, Part B , 1985, 40, 533. (Central Inst. Optics and Spectroscopy, Acad. Sci. of the GDR, 1199 Berlin, Rudower Chaussee 6, GDR). Jansen, G. W., Hue, F. A., De Jong, H. J., Low-power microwave plasma source for chromatography detection, Spectrochim. Acta, Part B , 1985, 40, 307. (Dept Pharm. Anal. Anal. Chem., Gorlaeus Lab., State Univ. Leiden, PO Box 9502, 2300 RA Leiden, The Netherlands).Goode, S. R., Buddin, N. P., Chambers, B., Baughman, K. W., Deavor, J. P., Influence of pressure on the properties of a microwave-induced plasma, Spectrochim. Acta, Part B , 1985, 40, 317. (Dept. Chem., Univ. South Carolina, Columbia, SC 29208, USA). Egorov, V. N., Startsev, V. V., The effect of a carrier on the residence time of atoms in an arc discharge plasma, Spectrochim. Acta, Part B , 1985,40,415. (Scientific Council on Spectroscopy, Acad. Sci. USSR, Pr. Sapunova, 13-15, 103012, Moscow, USSR). Papers 86/C125-86/C139 were presented at the Second Hungaro-Italian Symposium on Spectrochemistry, Budapest, 10-14th June 1985. 86/C125. Omenetto, N., Rossi, G., Laser-induced fluorescence and ionisation spectroscopy as analytical tool, (Chem. Div., Joint Res.Center, Ispra Establishment, 21020 - Ispra (Varese), Italy). 86/C126. Ottaviani, M., Magnatti, P., Atomic absorption spectrometry as applied to the determination of environmental pollution in vegetal tissues, (Istituto Superiore di SanitB, Viale Regina Elena 299,00161 - Rome, Italy). 86/C127. Liberti, A., Allegrini, I., Analytical and spectrochemical possibilities for the evaluation of the atmospheric environment, (Inst. Atmospheric Pollution, Natl. Council of Researches, Via Salaria krn '29.500, PO Box 10, 00016 - Monterotondo Stazione, Rome, Italy). 86/C128. Kantor, T., Releasing effects of the chlorides of alkaline earth elements and lanthanum in flame spectrometry, (Inst. General Anal. Chem., Technical Univ., Budapest, Hungary). 86/C129. Caroli, S., Alimonti, A., Petrucci, F., Zimmer, K., Florlian, K., A versatile approach to trace analysis: the microwave-coupled hollow cathode discharge, (Istituto Superiore di Sanith, Viale Regina Elena 299,00161 - Rome, Italy).86/C130. De Gregorio, P., Falessi, R., Petretto, C., Savastano, G., Direct spectrometric analysis of metal surfaces with glow discharge (GD) and spark emission sources, (Experimental Metallurgical Center, Via Caste1 Romano 100 - 102, PO Box 10747,00129 - Rome, Italy). 86/C131. Gogala, A., Some experience with the d.c. arc excitation of geological materials, (T.Z. Litostroj, Ljubljana, Yugoslavia). 86/C132. Lakatos, I., Direct FAES and FAAS analysis of 86/C 86/C 86lC macromolecular solutions, (Chem. Res. Lab. for Mining, Hungarian Academy of Sci., Miskolc-Egyetemvaros, Hungary).33. Vecsernyes, L., Optimum excitation of trace elements in natural materials, (Res. Inst. Telecommunication, Budapest, Hungary). 34. PISko, E., On the accuracy of spectroscopic analysis of geological materials, (Komenskjr Univ., Geol. Inst., Bratislava, USSR). 35. Pavlovic, B. V., Spectrochemical research of non-conducting materials, (Univ. Beograd, Faculty of Technol. and Metallurgy, Beograd, Yugoslavia). 86/C136. Danzer, K., Zimmer, K., Florian, K., Classification of spectrographic data with the help of multivariate statistical methods, (Friedrich-Schiller-Universitat Jena, Sektion Chemi, Jena, GDR). 86/C137. Papp, L., Kovacs, Z., Feasibility of the use of hollow cathode radiation sources for the spectroscopic analysis of biological material, (Inst.fur Anorg. und Anal. Chemie der L. Kossuth Universitat, H-4010 Debrecen, Hungary). 86/C138. Florian, K., Zimmer, K., Caroli, S., Optimisation of a spectrographic analytical method for powdered biological samples, (Lehrstuhl fur Chemie der Technischen Hochschule, Svermova 9, 043 85 KoSice, Czechoslovakia). 86/C139. Borszeki, J., Knapp, G., Trace element determination in organic materials with the use of the HPA (high pressure digestion) - ICP combined method, (Inst. fur Anal. Chemie, Mikro- und Radiochemie, Techn. Universitat, Graz, Austria). Papers 86/C14&86/C150 were presented at the Analytical Division of the Royal Society of Chemistry meeting on Research and Development Topics in Analytical Chemistry, Queen's University of Belfast, 27-28th June 1985.86/C140. Cresser, M. S.. Sampling stratem-from field to flame, 86/C 86/C (Dept. of Soil 'Science, Lberdein Univ., Meston Walk, Aberdeen AB9 2UE, UK). 41. Cook, I. G., McLeod, C. W., Worsfold, P. J., Use of sorbent, ion exchange and chelating materials in flow injection analysis systems with ICP detection, (Dept. Chem., Sheffield City Polytech., Sheffield S1 IWB, UK). 42. Hill, S. J., Ebdon, L., Jones, P., Novel approaches to directly coupled HPLC - FAAS for trace metal speciation, (Dept. Environ. Sci., Plymouth Polytech., Drake Circus, Plymouth PL4 8AA, UK). 86lC143. Johnson, D., Headridge, J. B., McLeod, C. W., Determination of chromium in gallium arsenide by electrothermal atomisation atomic absorption spectrometry with solid sample introduction, (Dept. Chem., Univ.Sheffield, Sheffield S3 7HF, UK). 86lC144. O'Grady, C. E., Marr, I. L., Cresser, M. S., Evaluation of variable impactors for flame spectroscopy, (Dept. Chem. and Soil Sci., Univ. Aberdeen, Meston Walk, Old Aberdeen AB9 2UE, UK).24R JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL. 1 86/C145. Clarke, P. A., McLeod, C. W., Mowthorpe, D. J., Lee, J. D., Atomic spectrometric studies on the volatilisation of low boiling-point elements from complex alloys, (Dept. Chem., Sheffield City Polytech., Sheffield S1 lWB, UK). 86/C146. McCabe, S., Ottaway, J. M., A novel method for the analysis of arsenic, antimony and selenium in single cell protein (Pruteen), (Dept. Pure and Appl. Chem., Univ. Strathclyde, Cathedral St., Glasgow G1 lXL, UK). 86/C147. Hall, D.H., Littlejohn, D., Ottaway, J. M., O’Haver, T. C., A software-controlled system for automatic background correction in ICP-OES, (Dept. Pure and Appl. Chem., Univ. Strathclyde, Cathedral St., Glasgow G1 IXL, UK). 861C148. Turner, P. S., A rapid cool-flame emission technique for the direct determination of sulphur in powdered steel samples, (Chem. Dept., Univ. Hull, Hull HU6 7RX, UK). 861C149. McKenna, M., Marr, I. L., Cresser, M. S., Microwave plasmas for gas analysis, (Dept. Chem. and Soil Sci., Univ. Aberdeen, Meston Walk, Old Aberdeen AB9 2UE, UK). 86/C150. Bysouth, S. R., Tyson, J. F., Comparison of curve fitting algorithms for atomic absorption spectrometry, (Dept. Chem., Univ. Technol., Loughborough, Leicestershire LEll3TU, UK). Papers 86/C151-86/C168 were presented at the 68th Annual Conference of the Chemical Institute of Canada, Queen’s University, Kingston, ON, Canada, 2-5th June 1985.86/C151. Douglas, D., Current developments in inductively coupled plasma mass spectrometer instrumentation, (Sciex, 55 Glen Cameron Road, Thornhill, ON L3T 1T2, Canada). 86/C152. Powell, M. J., Boomer, D., Analysis of acid rain samples by ICP-MS, (Ministry of the Environment, Province of Ontario, Rexdale, ON M9W 5L1, Canada). 86/C153. Brooker, E. J., Eagles, T. E., The application of ICP-MS to problems in analytical chemistry, (X-Ray Assay Lab., 1885 Leslie St., Don Mills, ON M3B 3J4,Canada). 86/C154. Doherty, W., Vander Voet, T., Application of an inductively coupled plasma mass spectrometer to the determination of trace elements in geological material, (Ontario Geol.Survey, 77 Grenville St., Toronto, ON M5S 1B3, Canada). 86/C155. Houk, S., Present status and future developments in inductively coupled plasma mass spectrometry, (Ames Lab., US Dept. Energy and Dept. Chem., Iowa State Univ., Ames, IA 50011, USA). 86/C156. Berman, S. S., Analysis of sea water for trace metals, (Anal. Chem. Section, Chem. Div., Natl. Res. Council of Canada, Ottawa, ON K1A OR9, Canada). 86K157. Blain, L. G., Sing, R. L. A., Salin, E. D., An evaluation of 861C 86/C the wire loop a s a method of sample introduction for the analysis of urine samples for trace levels of toxic elements using the direct sample insertion device for inductively coupled plasma atomic emission spectrometry, (Dept. Chem., McGill Univ., 801 Sherbrooke St.West, Montreal, Quebec H3A 2K6, Canada). 58. Wazney, K. J., Lau, M. P., Evaluation of a poly(acry1amidoxime) resin-packed column for saline water sample preparation in plasma spectrometry, (Atomic Energy of Canada Ltd., Pinawa, Manitoba ROE 1L0, Canada). 59. Duke, M. J., Ng, D., Kratochvil, R., Evaluation of the homogeneity of a Certified Reference Material by instrumental neutron activation analysis, (Slowpoke Reactor Facility and Dept. Chem., Univ. Alberta, Edmonton, Alberta T6G 2G2, Canada). 86K160. Kratochvil, R., Duke, M. J., Ng, D., Motkosky, N., A comparison of neutron activation analysis and graphite furnace atomic absorption for the determination of trace aluminium in biological materials, (Dept. Chem. and Slowpoke Reactor Facility, Univ.Alberta, Edmonton, Alberta T6G 2G2, Canada). 86/C161. Habib, M. M., Salin, E. D., Evaluation of performance of a reticulated vitreous carbon electrode for electrodeposition combined with inductively coupled plasma atomic emission spectrometry, (Dept. Chem., McGill Univ., 801 Sherbrooke St. West, Montreal, Quebec H3A 2K6, Canada). 86/C162. Bozic, J., Flora, W., Smith, F., Cousins, B., The pressure dissolution of sulphide mineral samples using a microwave oven, (INCO Ltd., Copper Cliff, ON POM 1N0, Canada). 861C163. Subramanian, K. S., Meranger, J. C., Wan, C. C., Corsini, A., Preconcentration of cadmium, chromium, copper and lead in drinking water on the polyacrylic ester resin, XAD-7, (Environ. Health Directorate, Health and Welfare Canada, Tunney’s Pasture, Ottawa, ON K1A OL2, Canada).86/C164. McLaren, J. W., Mykytiuk, A. P., Willie, S. N., Berman, S. S., The application of inductively coupled plasma mass spectrometry to sea water analysis, (Anal. Chem. Section, Chem. Div., Natl. Res. Council of Canada, Ottawa, ON K1A OR9, Canada). 86/C165. Lau, M. P., MacFarIane, R., Quinn, M., Wazney, K. J., Photographic techniques for plasma diagnostics, (At. Energy of Canada, Pinawa, Manitoba ROE 1L0, Canada). 861C166. Luffer, D. R., McGeorge, S. W., Salin, E. D., Performance of a high throughput nebuliser system designed for inductively coupled plasma atomic emission spectrometry, (Dept. Chem., McGill Univ., 801 Sherbrooke St. West, Montreal, Quebec H3A 2K6, Canada). 861C167. Horlick, G., Tan, S. H., Vaughan, M.A,, Rose, C. A., The effect of plasma operating parameters on analyte signals in inductively coupled plasma mass spectrometry, (Dept. Chem., Univ. Alberta, Edmonton, Alberta T6G 2G2, Canada). 86/C168. Hinds, M. W., Karwowska, R., Jackson, K. W., Vaporisation and atomisation studies during the direct analysis of solid samples by ETA-AAS, (Dept. Chem., Univ. Saskatchewan, Saskatoon, Sask. S7N OWO, Canada). 86/169. Hieftje, G. M., Rayson, G. D., Olesik, J. W., A steady-state approach to excitation mechanisms in the ICP, Spectrochim. Acta, Part B , 1985, 40, 167. (Dept. Chem., Indiana Univ., Bloomington, IN 47405, USA). Papers 86/C17&86/C187 were presented at Labcon West, Sun Mateo, CA, USA, 23-25th April 1985. 861C170. Horlick, G., Shao, Y.- B., Lepla, K., Current status of solid sample introduction systems for ICP-AES, (Dept.Chem., Univ. Alberta, Edmonton, Alberta T6G 2G2, Canada). 86/C171. Arellano, S. D., Routh, M. W., Adaptation of a new sample 86/C 86/C 86/C introduction and excitation system to the analysis of difficult samples, (Applied Research Laboratories, 9545 Wentworth St., Sunland, CA 91040, USA). 72. Voth, L. M., Brodie, K. G., Frary, B., Utilisation of hydride generation for the determination of As and Se in complex matrices, (Varian Instrument Group, 205 W. Touhy Ave., Park Ridge, IL 60068, USA). 73. Babis, J. S., The analysis of foods and beverages by direct coupled plasma, (Beckman Instruments Inc., PO Box C-19600, Irvine, CA 92713, USA). 74. Hedley, A. G., Taylor, H. E., Use of inductively coupled plasma and ion chromatography for the analysis of waters, (US Geological Survey, 5293 Ward Road, Mail Stop 407, Arvada, CO 80002, USA). 86/C175.Shabushnig, J. G., Demko, P. R., Savage, R. N., Applications of optical emission spectroscopy to semiconductor processing, (PT Analytical Inc., 56 Jonspin Rd., Wilmington, MA 01887, USA). 86/C176. Dabritz, J. L., The spectrochemical spreadsheet: automated atomic emission spectroscopy methods development, (DoBritz, PO Box 620, Tujunga, CA 91042, USA).JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL. 1 25R 86/C177. 86/C178. 86/C 179. 86/C180. 86lC181. 86lC 182. 86lC183. 86lC184. 86lC185. 861C186. 86lC187. 861188. 86/189. 861190. 861191. 861192. Brown, R. J., The determination of metals in the petroleum industry, (Chevron Research Co., Richmond, CA 94802, USA).Brenner, I. B., Application of ICP-AES for the analysis of geological materials---current status and future developments, (Geological Survey of Israel, 30 Malkhe Israel St., Jerusalem 95501, Israel). Anderson, T. A., Evans, K. L., Applications of atomic spectroscopy to the analysis of semiconductor related materials, (Motorola, Inc., 5005 East McDowell Road, Phoenix, AZ 85008, USA). Taylor, H. E., Hedley, A. G., Utilisation of atomic spectroscopy techniques in the assessment of water quality, (US Geological Survey, 5293 Ward Road, Mail Stop 407, Arvada, CO 80002, USA). Brenner, I. B., Current status-challenges and analytical potentials of the ICP, (Geological Survey of Israel, 30 Malkhe Israel St., Jerusalem 95501, Israel).Taylor, H. E., Garbarino, J. R., The use of ICP-MS for the routine determination of trace metals in natural waters, (US Geological Survey, 5293 Ward Road, Mail Stop 407, Arvada, CO 80002, USA). Goddard, P. J., Hutton, R. C., Shaw, C. J., Cantle, J. E., Brown, R., The application of ICP-MS, (VG Isotopes Ltd., Ion Path Road Three, Winsford, Cheshire CW7 3BX, UK). Brown, G. E., Michel, C. E., Analysis of radioactive materials by inductively coupled plasma atomic emission spectroscopy, (Anal. Lab., Rockwell International, PO Box 464, Golden, CO 80401, USA). Routh, M. W., Advances in liquid sample introduction techniques for ICP-AES, (Applied Res. Lab. Inc., 9545 Wentworth St., Sunland, CA 91040, USA). Skidmore, T., Lenington, V., Schleisman, T., Applications of ICP-AES in microelectronics manufacturing, (Texas Instruments, PO Box 660246, Dallas, TX, USA).Manabe, R. M., Nygaard, D. D., Leighty, D. A,, Multi-element analysis of drinking water and effluent streams by electrothermal atomisation into an ICP emission spectrometer, (Allied Analytical Systems, 115 Constitution Drive, Menlo Park, CA 94025, USA). Mehra, M. C., Krishan Puri, B., Iwasaka, K., Satake, M., Determination of palladium by atomic absorption spectrophotometry after adsorption of its acenaphthenequinone dioxime complex on microcrystalline napthalene, Analyst, 1985, 110,791. (Chem. and Biochem. Dept., Universitk de Moncton, Moncton, NB, Canada). Ramsey, M. H., Thompson, M., Correlated variance in simultaneous inductively coupled plasma atomic emission spectrometry: its causes and correction by a parameter-related internal standard method, Analyst, 1985, 110, 519.(Appl. Geochem. Res. Group, Dept. Geology, Imperial Coll. Sci. Technol., London SW7 2BP, UK). Davies, J., Dean, J. R., Snook, R. D., Axial view of an inductively coupled plasma, Analyst, 1985,110,535. (Dept. Chem., Imperial Coll. Sci. Technol., London SW7 2AY, UK). Jansen, E. B. M., Demers, D. R., Hollow-cathode lamp-excited inductively coupled plasma atomic fluorescence spectrometry: performance under compromise conditions for simultaneous multi-element analysis, Analyst, 1985, 110, 541. (Baird Europe B.V., Produktiewag 30, Zoeterwoude, The Netherlands). Vollkopf, U., Grobenski, Z., Tamm, R., Welz, B., Solid sampling in graphite furnace atomic absorption spectrometry using the cup-in-tube technique, Analyst, 1985, 110, 573.(Bodenseewerk Perkin-Elmer & Co. GmbH, Postfach 1120, D-7770 Uberlingen, FRG). 861193. 861194. 861195. 8611 96. 861197. 861 198. 861199. 861200. 86/201. 861202. 861203. 861204. 861205. Brown, A. A., Taylor, A., Applications of a slotted quartz tube and flame atomic absorption spectrometry to the analysis of biological samples, Analyst, 1985, 110,579. (Pye Unicam Ltd., York Street, Cambridge CB1 2PX, UK). Lowe, D. S., Determination of trace elements in nickel-base superalloys using a high-temperature hollow-cathode source, Analyst, 1985, 110,583. (E135/24, DQAITS, Royal Arsenal East, London SE18 6TD, UK). Gardiner, P. E., Stoeppler, M., Nurnberg, H. W., Optimisation of the analytical conditions for the determination of aluminium in human blood plasma or serum by graphite furnace atomic absorption spectrometry.Part I. Examination of the various analytical conditions, Analyst, 1985, 110, 611. (Institut fur Chemie der Kernforschungsanlage Julich GmbH, Institut 4, Angewandte Physikalische Chemie, Postfach 1913, D-5170 Julich, FRG). Gray, A. L., Solid sample introduction by laser ablation for inductively coupled plasma source mass spectrometry, Analyst, 1985, 110, 551. (Dept. Chem., Univ. Surrey, Guildford, Surrey GU2 5XH, UK). Baxter, D. C., Frech, W., Lundberg, E., Determination of aluminium in biological materials by constant-temperature graphite furnace atomic emission spectrometry, Analyst, 1985, 110,475. (Dept. Anal. Chem., Univ. Umek S-901 87 Umeii, Sweden). Dymott, T.C., Wassall, M. P., Whiteside, P. J., Evaluation of totally pyrolytic graphite cuvettes for electrothermal atomic absorption spectrometry, Analyst, 1985, 110, 467. (Pye Unicam Ltd., York Street, Cambridge CB1 2PX, UK). Welz, B., Akman, S., Schlemmer, G., Investigations of interferences in graphite furnace atomic absorption spectrometry using a dual cavity platform . Part 1. Influence of nickel chloride on the determination of antimony, Analyst, 1985, 110, 459. (Dept. of Appl. Res., Bodenseewerk Perkin-Elmer & Co. GmbH, Postfach 1120, D-7770, Uberlingen, FRG). Tyson, J. F., Adeeyinwo, C. E., Appleton, J. M. H., Bysouth, S. R., Idris, A. B., Sarkissian, L. L., Flow injection techniques of method development for flame atomic absorption spectrometry, Analyst, 1985, 110, 487.(Dept. Chem., Univ. Technology, Loughborough, Leicestershire LEll 3TU, UK). Evans, W. H., Read, J. I., Determination of lithium, rubidium and strontium in foodstuffs, Analyst, 1985, 110, 619. (Dept. Trade and Industry, Lab. of the Government Chemist, Cornwall House, Waterloo Road, London SE1 8XY, UK). Pearce, W. C., Thornewill, D., Marston, J. H., Multi-element analysis of solutions of coal ash using inductively coupled plasma optical emission spectrometry, Analyst, 1985, 110, 625. (National Coal Board, East Midlands Regional Lab., 2 Station St., Mansfield Woodhouse, Nottinghamshire NG19 8AA, UK). O’Grady, C. E., Marr, I. L., Cresser, M. S., Patterns and causes of deposition losses in a simple spray chamber, Analyst, 1985,110,729.(Depts. of Chem. and Soil Science, Univ. Aberdeen, Meston Walk, Old Aberdeen AB9 2UE, UK). O’Haver, T. C., Harnly, J. M., Marshall, J., Carroll, J., Littlejohn, D., Ottaway, J. M., A microcomputer-controlled background correction system for atomic spectrometry, Analyst, 1985, 110, 451. (Dept. Chem., Univ. Maryland, College Park, MD 20742, USA). Gustavsson, A. G. T., Theoretical considerations on the measurement of nebuliser suction, Analyst, 1985,110,885. (Dept. Anal. Chem., Royal Institute of Technology, S-100 44 Stockholm, Sweden).26R 861206. 861207. 861208. 861209. 8612 10. 86/21 1. 861212. 8612 8612 861215. 86/21 6. 861217. 8612 18. JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL. 1 Thompson, M., The capabilities of inductively coupled plasma atomic emission spectrometry-some conjectures and refutations, Analyst, 1985, 110,443.(Appl. Geochem. Res. Group, Dept. of Geology, Imperial Coll. Sci. Technol., London SW7 2BP, UK). Sanz-Medel, A,, Sanchez Uria, J. E., Arribas Jimeno, S., Enhancement of molybdenum inductively coupled plasma emission by forming volatile species in organic solvents, Analyst, 1985, 110, 563. (Dept. Anal. Chem., Fac. Chem., Univ. Oviedo, Oviedo, Spain). Hughes, H., An overview of solid sampling analysis, Anal. Proc., 1985, 22, 232. (Consultant (Metallurgical Analysis), 7 Rowan Avenue, Guisborough, Cleveland TS14 SDR, UK). Analytical Methods Committee, Evaluation of analytical instrumentation. Part 11. Atomic absorption spectrophotometers, primarily for use with electrothermal atomisers, Anal.Proc., 1985, 22, 128. (Royal Society of Chemistry, Burlington House, Piccadilly, London W1V OBN, UK). Dabeka, R. W., BASIC computer subroutine for routine application of graphite furnace atomic absorption spec- trometry, Can. J. Spectrosc., 1984,29,109. (Food Director- ate, Food Res. Div., Health Protection Branch, HWC, Tunney’s Pasture, Ottawa, ON K1A OL2, Canada). Frech, W., Ottaway, J. M., Bezur, L., Marshall, J., Determination of manganese in urine by electrothermal atomic emission spectrometry, Can. J . Spectrosc., 1985,30, 7. (Dept. Pure and Appl. Chem., Univ. Strathclyde, 295 Cathedral Street, Glasgow G1 lXL, UK). Zander, A. T., Miller, M. H., Hendrick, M. S., Eastwood, D., Spectral efficiency of the Spectraspan I11 echelle grating spectrometer, Appl.Spectrosc., 1985, 39, 1. (SpectraMetrics Inc., 75 Foundation Ave., Haverhill, MA 01831, USA). Cremers, D. A., Radziemski, L. J., Direct detection of beryllium on filters using the laser spark, Appl. Spectrosc., 1985, 39, 57. (Univ. California, Los Alamos Natl. Lab., Chem. Div., Los Alamos, NM 87545, USA). Omenetto, N., Berthoud, T., Cavalli, P., Rossi, G., Lifetime measurements of metastable levels of thallium and lead in the air - acetylene flame by laser-enhanced ionisation spectrometry, Appl. Spectrosc., 1985, 39, 500. (Joint Res. Center, Chem. Div., Ispra (Varese), Italy). Messman, J. D., Schmidt, N. E., Parli, J. D., Green, R. B., Laser-enhanced ionisation of refractory elements in a nitrous oxide - acetylene flame, Appl.Spectrosc., 1985,39, 504.(Dept. Chem., Univ. Arkansas, Fayetteville, AR 72701, USA). Lowe, M. D., Sutton, M. M., Characteristics of capillary discharge lamp developed for determination of S, P, Se and As by flame atomic absorption spectroscopy, Appl. Spectrosc., 1985,39, 519. (Spectrochemical Lab., Ruakura Soil and Plant Res. Station, Private Bag, Hamilton, New Zealand). Panday, V. K., Ganguly, A. K., Measurement of monoatomic vapour concentrations of some elements by atomic absorption spectrophotometry: Cu, Ag, Au, Mn and Al, Appl. Spectrosc., 1985, 39, 526. (Health Physics Div., Bhabha Atomic Res. Center, Trombay, Bombay 400085, India). Deutsch, R. D., Keilsohn, J. P., Hieftje, G. M., Analytical characteristics of the microwave-induced nitrogen discharge at atmospheric pressure (MINDAP), Appl.Spectrosc., 1985, 39, 531. (Dept. Chem., Indiana Univ., Bloomington, IN 47405, USA). 861219. 861220. 861221. 861222. 861223. 861224. 861225. 861226. 861227. 861228. 861229. 861230. 86/23 1. 861232. 861233. Garbarino, J. R., Jones, B. E., Stein, G. P., Belser, W. T., Taylor, H. E., Statistical evaluation of an inductively coupled plasma atomic emission spectrometric method for routine water quality testing, Appl. Spectrosc., 1985, 39, 535. (US Geol. Survey, MS 407, PO Box 25046, Denver Federal Center, Denver, CO 80225, USA). Faske, A. J., Snable, K. R., Boorn, A. W., Browner, R. F., Microliter sample introduction for ICP-AES, Appl. Spectrosc., 1985, 39, 542. (School of Chem., Georgia Inst. Technol., Atlanta, GA 30332, USA). Matusiewicz, H., Horvath, Z., Barnes, R.M., Determination of mercury in drinking water by inductively coupled plasma atomic emission spectrometry with electrothermal vaporisation, Appl. Spectrosc., 1985, 39, 558. (Dept. Chem., GRC Towers, Univ. of Massachusetts, Amherst, MA 01003-0035, USA). Marquardt, D., Luerderitz, P., Leppin, S., Grosser, J., Use of inductively coupled plasma spectrometry for determination of trace elements in hair, Zentralbl. Pharm., Pharmakother. Laboratoriumsdiagn., 1985,124,191. (Abt. Agnew. Hyg., Humboldt-Univ. Berlin, DDR-1040 Berlin, GDR). Morganti, J. B., Lown, B. A., Stineman, C. H., D’Agostino, R. B., Massaro, E. J., Uptake, distribution and behavioral effects of inhalation exposure to manganese (Mn02) in the adult mouse, Neurotoxicology, 1985,6, 1.(Dept. Psychol., SUNY, Buffalo, NY 14222, USA). Bond, A. M., Bradbury, J. R., Hudson, H. A., Garnham, J. S., Hanna, P. J., Strother, S., Kinetic studies of lead(I1) uptake by the seagrass Zostera muelleri in water by radiotracing, atomic absorption spectrometry and electrochemical techniques, Mar. Chem., 1985, 16, 1. (Div. Chem. Phys. Sci., Deakin Univ., Geelong, Victoria 3217, Australia). Tomioka, K., Endo, K., Zinc content and subunit structure of carp muscle 5’-nucleotidase, Nippon Suisan Gakkaishi, 1985, 51, 857. (Nara Univ. Educ., Nara 630, Japan). Fan, S., Fang, Z., Determination of thirteen elements in plant ashes by high-voltage spark emission spectrometry using graphite rotating disk electrodes, Guangpuxue Yu Guangpu Fenxi, 1985,5(1), 59. (Inst. For.Soil, Acad. Sin., Shenyang, China). Schramel, P., Lill, G., Hasse, S., Mineral and trace elements in human urine, J . Clin. Chem. Clin. Biochem., 1985, 23, 293. (Inst. Angew. Phys., Ges. Strahlen- und Umweltforsch. mbH, D-8042 Oberschleissheim, FRG). Kanai, T., A study of trace elements in deciduous teeth. Difference in the elements among several layers of teeth, Shika Kiso Igakkai Zasshi, 1985, 27, 172. (Dept. Pedodontics, Kanagawa Dent. Coll., Yokosuka, Japan). Chilvers, D. C., Hodgkinson, A., Age- and sex-related variations in the distribution of copper and zinc in human plasma, Trace Elem. Med., 1985, 2, 22. (MRC Miner. Metabol. Unit, Gen. Infirm., Leeds LS1 3EX, UK). Andersen, J.R., Zeeman-corrected graphite furnace atomic absorption spectrometric screening method for the determination of lead in infant formulas and powdered milks, Analyst, 1985,110,315. (Dept.Chem., R. Dan. Sch. Pharm., Copenhagen, DK-2100, Denmark). Liese, T., Analysis of elements for the determination of soil to plant transfer factors, Kernforschungszent. Karlsruhe. (Ber.] KfK, 1985, KfK 3830. (Hauptabt. Sicherh., Kernforschungszent. Karlsruhe GmbH, Karlsruhe, FRG). Lyons, D. J., Lynch, P. J., Determination of exchangeable cations (calcium, magnesium, sodium, potassium) in aqueous and alcoholic ammonium chloride extracts of soils using ICP-ES, Commun. Soil Sci. Plant Anal., 1985,16,15. (Dept. Primary Ind., Indooroopilly 4068, Australia). Hughes, M. J., Archaeological applications of atomic absorption spectrometry, Anal. Proc., 1985, 22, 75.(Res. Lab., British Museum, London WClB 2DG, UK).JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL. 1 27R 861234. 861235. 861236. 861237. 861238. 861239. 861240. 861241. 861242. 861243. 861244. 861245. 861246. 861247. 861248. 861249. Tsuge, A., Uwamino, Y., Ishizuka, T., Determination of chlorine in silicon nitride by pressurised acid decomposition - atomic absorption method, Yogyo Kyokaishi, 1985, 93, 182. (Gov. Ind. Res. Inst. Nagoya, Nagoya 462, Japan). Nakagawa, R., Particulate mercury concentration and its behaviour in urban ambient air, Nippon Kagaku Kaishi, 1985, (4), 709. (Fac. Sci., Chiba Univ., Chiba 260, Japan). Yu, G., Determination of total gaseous mercury in the atmosphere of Beijing tourist area, Huanjing Huaxue, 1985, 4(2), 74. (Inst.Environ. Chem., Acad. Sinica, Beijing, China). Watling, R. J., Talbot, M. M. J. F., Branch, E. B., Marsland, S. A., Metal surveys in South African estuaries. IX. Buffalo River, Water S A , 1985,11(2), 61. (Zool. Dept., Univ. Port Elizabeth, Port Elizabeth 6000, South Africa). Talbot, M. M. J. F., Branch, E. B., Marsland, S. A., Watling, R. J., Metal surveys in South African estuaries. X. Blind Ihlanza, Nahoon and Quinera Rivers, Water S A , 1985, 11(2), 65. (Zool. Dept., Univ. Port Elizabeth, Port Elizabeth 6000, South Africa). Scholle, S., Scholle, S., MI., Evaluation of AASIAES calibration curves by TI 58/59 calculators, Chem. Listy, 1985,79,424. (N. P. Vychodoceske Chem. Zavody Synth., 532 17 Pardubice, Czechoslovakia). Vamos-Szilvassy, Z., Buzasi-Gyorfi, A., Comparison of trace analytical results obtained with different hollow cathode discharge lamps, Mikrochim.Acta, 1985, 1, 15. (Inst. Radiochem. Phys., Veszprem Univ. Chem. Eng., H-8201 Veszprem, Hungary). - Atnashev, Yu. B., Korepanov, V. E., Muzgin, V. N., Use of automatic temperature-control for a tungsten coil atomiser, Zh. Prikl. Spektrosk., 1985, 42, 537. (USSR). Grinshtein, 1. L., Katskov, D. A., Kopeikin, V. A., Khodorkovskii, M. A., Self-reversal of spectral lines emitted by the hollow-cathode lamps with a pulsed electrical supply, Zh. Prckl. Spektrosk., 1985, 42, 709. (USSR). Liddell, P. R., System integration for atomic absorption, Am. Lab. (Fairfield, Conn.), 1985, 17(5), 100. (Varian Techtron Pty. Ltd., Springvale Rd., Mulgrave, Victoria 3170, Australia).De Doncker, K., Dumarey, R., Dams, R., Hoste, J., The use of 1 ,lO-phenanthroline in minimising the nickel interference in determinations of bismuth and antimony by hydride generation atomic absorption spectrometry, Anal. Chim. Acta, 1985, 169, 339. (Inst. Nucl. Sci., Rijksuniv. Gent, B-9000 Ghent, Belgium). Park, K. C., Choi, H. S., Kwon, S. H., Studies on the releasing effect of cerium in calcium analysis by- atomic absorption spectrometry, Taehan Hwahakhoe Chi, 1985, 29, 129. (Dept. Chem., Korea Univ., Seoul, 132, South Korea). Goguel, R., Hydrothermal extraction of potassium, sodium, rubidium and cesium from rocks by lithium hydroxide and determination at very low natural levels, Anal. Chim. Acta, 1985, 169, 179. (Chem. Div., DSIR, Lower Hutt, New Zealand).Lee, K. W., Yoo, Y. J., Studies on ion-exchange chromatography of elements in special nonferrous alloys, Taehan Hwahakhoe Chi, 1985, 29, 178. (Natl. Ind. Res. Inst., Seoul, South Korea). Pyatnitskii, I. V., Sukhan, V. V., Onishchenko, T. A., Onishchenko, Yu. K., Kashpor, V. N., Use of capric acid for preconcentration of trace manganese, Ukr. Khim. Zh. (Russ. E d . ) , 1985, 51, 193. (Kiev. Gos. Univ., Kiev. USSR). Shevchuk, 1. A., Alemasova, A. S., Rokun, A. N., Extraction separation and flameless atomic absorption determination of rare earth elements in chloride solutions, Ukr. Khim. Zh. (Russ. Ed.), 1985,51, 197. (Donetsk. Gos. Univ., Donetsk, USSR). 861250. 86/25 1. 861252. 861253. 861254. 861255. 861256. 861257. 861258. 861259. 861260. 861261. 861262.861263. Mostafa, M. A., Kabil, M. A., Atomic absorption spectrometric determination of rhodium, Zndian J . Chem., Sect. A , 1985, 24, 260. (Fac. Sci., Mansoura Univ., Mansoura, Egypt). Henrion, G., Heininger, P., Trace metal determination in phosphoric acid after coprecipitation with bismuth phosphate, 2. Chem., 1985, 25(3), 97. (Sekt. Chem., Humboldt-Univ. Berlin, GDR). Yoshimura, C., Huzino, T., Direct determination of molybdenum disulphide by atomic absorption spectrometry in the presence of carbon black, Nippon Kagaku Kaishi, 1985, ( 5 ) , 882. (Fac. Sci. Eng., Kinki Univ., Higashiosaka 577, Japan). Lee, W., A study on the determination of some heavy metals using microsampling technique in flame atomic absorption spectrometry, Taehan Hwahakhoe Chi, 1985, 29,220.(Dept. Chem., Kyung Hee Univ., Seoul 131, South Korea). Bastiaans, G. J., Mangold, R. A., The calculation of electron density and temperature in Ar spectroscopic plasmas from continuum and line spectra, Spectrochim. Acta, Part B , 1985, 40, 885. (Dept. Chem., Texas A & M Univ., College Station, TX 77843, USA). Meyer, G. A., Barnes, R. M., Analytical inductively coupled nitrogen and air plasmas, Spectrochim. Acta, Part B , 1985, 40, 893. (Dept. Chem., GRC Towers, Univ. Massachusetts, Amherst, MA 01003-0035, USA). Barnes, R. M., KovaEic, N., Meyer, G. A., Computer simulation of a nitrogen ICP discharge, Spectrochim. Acta, Part B, 1985, 40, 907. (Dept. Chem., GRC Towers, Univ. Massachusetts, Amherst MA 01003-0035, USA). Holclajtner-Antunovic, I., Tripkovic, M., Radovanov, S., Todorovic, M., The influence of non-easily ionised elements on emission intensities in a d.c. arc plasma, Spectrochim. Acta, Part B , 1985, 40, 919. (Fac. Sci., Inst. Physical Chem. and Chem., Beograd, Yugoslavia). Downey, S. W., Keaton, G. L., Nogar, N. S., Spatially resolved, intracavity absorption for inductively coupled plasma diagnostics, Spectrochim. Acta, Part B , 1985, 40, 927. (Chem. Div., Los Alamos Natl. Lab., Los Alamos, NM 87545, USA). Marcus, R. K., Harrison, W. W., The hollow cathode plume. A plasma emission source for solids, Spectrochim. Acta, Part B , 1985, 40, 933. (Dept. Chem., Univ. Virginia, Charlottesville, VA 22901, USA). KovaCiC, N., Meyer, G. A., Liu, K;-L., Barnes, R. M., Diagnostics in an air inductively coupled plasma, Spectrochim. Acta, Part B , 1985, 40, 943. (Dept. Chem., GRC Towers, IJniv. Massachusetts, Amherst, MA 01003-0035, USA). Ortner, H. M., Schlemmer, G., Welz, B., Wegscheider, W., Scanning electron microscopy studies on surfaces from electrothermal atomic absorption spectrometry-I. Polycrystalline electrographite tubes with and without pyrographite coating, Spectrochim. Acta, Part B , 1985,40, 959. (Metallwerk Plansee GmbH, A-6600 Reutte, Austria). Ebenberger, H., Wernisch, J., Determination of the distribution coefficients of Si and Fe by spectroscopic methods, Spectrochim. Acta, Part B , 1985, 40, 979. (Inst. fur Angewandte und Technische Physik, Technische Universitat Wien, Karlsplatz 13, A-1040 Wien, Austria). Caughlin, B. L., Blades, M. W., Spatial profiles of electron density in the inductively coupled plasma, Spectrochim. Acta, Part B , 1985, 40, 987. (Dept. Chem., Univ. British Columbia, Vancouver, British Columbia V6T 1Y6, Canada).28R JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, FEBRUARY 1986, VOL. 1 86/264. Zyrnicki, W., Poslednik, J., Excitation temperatures of 861265. El Nady, A. B. M., Zimmer, K., Zaray, G., Spectrochemical analysis of mediaeval glasses by means of inductively coupled plasma and glow discharge sources, Spectrochim. Acta, Part R , 1985,40, 999. (Inst. Inorg. and Anal. Chem. of L. Eotvos Univ., PO Box 123, H-1443 Budapest, Hungary). atoms and ions in a hollow cathode discharge, Spectrochim. Acta, Part I?, 1985, 40, 995. (Inst. Inorg. Chem. and Metallurgy of Rare Elements, Technical Univ. Wroclaw, 50-370 Wroclaw , Poland).

ISSN:0267-9477    

DOI:10.1039/JA986010019R

出版商:RSC    

年代:1986

数据来源: RSC