摘要:

Proceed.ings of the Society for Analytical Chemistry CONTENTS J oi n t Pharmaceutical Analysis Group . . . . . . . . 95 Reports of Meetings . . . . 95 “Inertial Methods of Particle-size Analysis . . . - . . 96 “Pyrolytic Gas Chromatography” 98 “Automatic Analysis” . . .. 100 Papers Accepted for The Analyst I0 I Publications Received . . . . 102 Notices . . . . . . . . 102 Announcements . . . . . . 104 Forthcoming Meetings . . . . 104 Proc SOC. Analyt. Chem. Vol. 6 No. 6 Pages 95-104 June 1969 Vol. 6 No. 6 A remittance made out to “Society for Analytical Chemistry” should accompany every order. Members of the Society may purchase copies at the special price of 5s. post free. I June 1969 PROCEED1 NGS THE SOCIETY FOR ANALYTICAL CHEMISTRY OF President of the Society T S West Hon. Secretory of the Society W.H. C. Shaw Hon. Treasurer of the Society G. W. C. Milner Hon. Assistant Secretaries of the Society D. 1. Coomber; D. W. Wilson Secretary Miss P. E. Hutchinson 9/10 SAVILE ROW LONDON WIX IAF Telephone 0 1-734 6205 Editor J. B. Attrill Telephone 01-734 3419 Proceedings i s published by The Society for Analytical Chemistry and distributed t o all members of the Society and t o subscribers with The Analyst; subscriptions cannot be accepted for Proceedings alone. Single copies may be obtained direct from the Society’s Distribution Agents The Chemical Society Publications Sales Office Blackhorse Road Letchworth Herts. (NOT through Trade Agents) price 0 The Society for Analytical Chemistry 5s. post free. Remittances MUST accompany orders. The Determination of Sterols Society for Analytical Chemistry Monograph No. 2 -+- This Monograph contains six papers on various aspects of the determination of sterols by colorimetric and chromato- graphic methods applicable in many fields -+- Available 0 N LY from The Society for Analytical Chemistry Book Department 9/10 Savile Row London WIX IAF. (Not through Trade Agents) Price 15s. or US. $2.00 Post free

ISSN:0037-9697    

DOI:10.1039/SA96906FX020

出版商:RSC    

年代:1969

数据来源: RSC

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104 THE SOCIETY FOR ANALYTICAL CHEMISTRY Forthcoming Meetings July Monday 14th to ATOMIC-ABSORPTION SPECTROSCOPY GROUP jointZy with the Spectroscopy Friday 18th Group of the Institute of Physics International Atomic Absorption SHEFFIELD Spcctroscopy Conference. The University Sheffield. Monday 2 1st to Friday 25th B I R M I N c H AM MIDLANDS SECTION International Symposium on Analytical Chemistry. The University Birmingham. Printed b y W Heffer & Sons Ltd Cambridge England

ISSN:0037-9697    

DOI:10.1039/SA96906BX022

出版商:RSC    

年代:1969

数据来源: RSC

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June 1969 Reports of Meetings Vol. 6 No. 6 NOnTH OF ENGLAND SECTION 1 HE thirty-second Summer Meeting of the Section was held from Friday May ‘SOth to Monday June 2nd 1969 at the Castle Hotel Scarborough. The Chairman of the Section Mr. R. Sinar presided over an Ordinary Meeting on the morning of Saturday May 31st at which a lecture on “Evolution of the Ice Cream Industry,’’ was given by K. A. Hyde. WESTERN SECTION THE Summer Meeting of the Section was held on Saturday May 31st 1969 and started at the Sportsman Steak House Rode. The Chair was taken by the Chairman of the Section 1)r. I). Bet teridge . The subject of the meeting was “Industrial Archaeology of the Cloth Industry,” and the speaker and guide was K. Hudson. The meeting included visits to Trowbridge and Bradford- on-Awn. r _ EAST ANGLIA SECTION AN Ordinary Meeting of the Section was held at 2.30 p.m.on Wednesday May 14th 1969 at the University of Essex Wivenhoe Park Colchester. The Chair was taken by the Chairman of the Section Mr. C. E. Waterhouse. The subject of the meeting was “Applications of Spectroscopy” and the following papers were presented and discussed “Fluorescence Spectroscopy and its Applications,” by G. F. Moss; “Chemical Uses of Proton Magnetic Resonance,” by P. D. Ralph; “X-ray Fluorescence Analysis,” by G. D. Woodward. MICROCHEMICAL METHODS GROUP THE sixty-ninth London Discussion Meeting of the Group was held at 6.30 p.m. on. Wednesday April 30th 1969 at “The Feathers,” Tudor Street London E.C.4. The Chair was taken by the Chairman Dr. G. Tngram. A discussion on “The Use of Instruments in the Analysis of Organic Materials,” was introduced by A.G . Jones. 95 9 6 INERTIAL METHODS OF PARTICLE-SIZE ANALYSIS [Prac. Sac. AYtaZyt. Chent. BIOLOGICAL METHODS GROUP THE Summer Meeting of the Group was held at 11 a.m. on Thursday May 22nd 1969. The meeting took the form of a visit to the Wellcome Research Laboratories Langley Court Beckenham and included biological reagents and pathology demonstrations and a tour of the Pharmacology and Tropical Medicine Laboratories. PARTICLE SIZE ANALYSIS GROUP AN Ordinary Meeting of the Group was held at 2.30 p.m. on Wednesday May 7th 1969 at the School of Pharmacy Urunswick Square London IV.C.1. The Chair was taken by the Chair- man of the Group Dr. H. Heywood. The subject of the meeting was “Why Particle-size Analysis ? ” and the following papers were presented and discussed “Particle-size Aspects of Cement Technology,” by R. G. Blezard; “Particle-size Analysis in Powder Metallurgy,” by V. T. Morgan ; “The Importance of Particle-size Analysis in Studies on the Rheological Properties of Emulsions,” by P. Sherman ; “Size Analysis and the Effects of Dispersion,” by W. E. Craker; “Particle-size Analysis in the Pharmaceutical Industry,]’ by N. A. Armstrong; “Particle-size Analysis of Pigments,” by V. T. Crowl.

ISSN:0037-9697    

DOI:10.1039/SA969060095b

出版商:RSC    

年代:1969

数据来源: RSC

摘要:

INERTIAL METHODS OF PARTICLE-SIZE ANALYSIS [Prac. Sac. AYtaZyt. Chent. Inertial Methods of Particle-size Analysis The following arc summaries of two of the papers presented at a Joint Meeting of tlie North of England Section and the Particle Size Analysis Group held on March 5th 1969 and reported in the April issue of Proceedings (p. 55). Sampling by Impaction BY W. J. MEGAW (Health Physics and Medical Division A.E.R. E. Hamell Didcot Bevks.) THE difficulties in obtaining an adequate and representative sample of aerosols were discussed and two instruments that collect a sample give some size discrimination and retain the virtues of simplicity and comparative cheapness were described. The cascade impactor developed by May1 involves the use of four impingement stages in series. In each stage gas flowing through a rectangular jet impinges on a glass slide and is deflected through 90O.Particles of sufficient inertia are unable to negotiate the turn and are collected on a glass slide. By making the jets progressively smaller it is possible to collect particles down to about 1 pm diameter on the fourth stage and the addition of a filter-paper stage enables the smallest fraction of the particles to be collected. There is a certain amount of overlap on the slides so that for example 90 per cent. of 2.5 pm diameter unit density spheres pass stage 2 and 10 per cent. of them pass stage 3. Because of the high rate of aspiration (174 1 minute-I) sampling time is limited by the accumulation of deposit on the slides and in very high concentrations the shortness of the sampling time can be an enibarrassment.To overcome this difficulty a model in which the collecting slides are moved simultaneously along their guides has been developed by Mays2 Methods recommended for retaining particles and droplets on the slides are (i) for particles a 1 + 1 mixture of castor oil and resin; and (ii) for droplets the method of Liddell and Wootten3 for coating the slides with a solution of a water-soluble dye (Naphthol green S ) in gelatin. An experiment to determine the wall losses in the impactor with a niethylene blue aerosol indicated that 20 per cent. w/w of the aerosol was lost on the walls and jets of the impactor. This depends on the principle that if an aerosol is drawn through an orifice in a plate particles tend to be con- centrated in the centre of the stream and can be collected through a cone-shaped nozzle that Different results would be obtained for aerosols of different size distributions.The cascade centripeter developed by Hounam4 was also described. June 19691 INERTIAL METHODS OF PARTICLE-SIZE ANALYSIS 97 faces the orifice and carries about 3 per cent. of the flow. Size discrimination is achieved by placing stages with successively smaller orifices in series. The samples are collected on filter-papers in the bases of the conical nozzles and are in a form suitable for weighing or radioactive assay. A calibration shows that large particles (greater than 20 pm diameter) and very small particles (less than 0.3 pm diameter) are collected on stages 1 and 4 respect- ively with an efficiency approaching 100 per cent. Stage 2 collects 7 pm diameter particles and stage 3 2 p m diameter particles with an efficiency of 60 per cent.The losses arise from retention of particles on the walls of the instrument. The outstanding advantage of the cascade centripeter is that it can operate at a comparatively high flow-rate (30 1 minute-l) for long periods (several days). It is possible by suitable design to use it for the separation of aerosols into respirable and non-respirable fractions. 1. May K. R. J . Scient. Instrum. 1945 22 107. 2. 3. 4. - A.M.A. Archs. Ind. Hlth 1956 13 5. Liddell H. F. and Wootten N. W. Q. J.R. Met. SOC. 1957 83 356. Hounam R. F. Amer. Ind. Hyg. Ass. J. 1965 26 122. Air Classification of Flour with the Bahco BY N. L. KENT (Flour Milling and Baking Reseavch Association St. A Ibaizs Hevts.) THE endosperm of wheat from which white flour is obtained is a cellular tissue the cell contents within the thin cell walls comprising a continuous protein matrix in which are embedded rounded or lenticular starch granules in two size ranges the larger size (15 to 40 pm) preponderating on a weight basis.The cellular structure persists to some extent in ordinary roller-milled flour but the cell contents are disrupted by fine grinding on a pinned-disc mill. The protein matrix is fragmented to particles mostly below 17 pin in size while the starch granules are released intact. Air classification of finely ground flour into three fractions at 17 and 35-pm cut sizes thus results in protein displacement the fine and intermediate fractions having protein contents higher and lower respectively than that of the parent flour.Protein displacement by air classification is a valuable process now being applied in inany commercial flour mills. Investigation of the process can conveniently be made with the Bahco centrifugal air elutriator a laboratory-scale air classification machine that gives results closely concordant with those of the commercially used Alpine Mikroplex. The Bahco makes a separation a t a pre-determined cut size into fine and coarse fractions. Separation into three or more fractions is accomplished by successive feeding of fractions at various cut sizes. In the separating chamber a centrifugal force is opposed to an air drag; oversize particles move against the air current undersize particles with it. The cut sizeis determined by the width of the annular air inlet which can be adjustably throttled.The machine accepts samples of up to 30 g at a rate of 2 g minute-l. Fine and coarse fractions are recovered by dismantling the machine. Recovery of dry matter in the fractions is gener- ally 98 per cent. or better. The nominal cut size for flour is determined microscopically as the size of the largest starch granules in the fine fraction; the critical cut size is that size at which sharpness of classification is at a maximum sharpness being defined as the maximum ordinate difference between the particle-size distribution curves for fine and coarse fractions. As the coarse fraction generally contains 20 to 35 per cent. of undersized material the critical cut size is often a little lower than the nominal cut size. Particle-size distribution of Bahco fractions determined with a Coulter Counter showed that sharpness was about 60 per cent. For use in flour-milling research the lack of sharpness of the Bahco is offset by the advantages of small sample size good recovery and good replicability. The Bahco has been used to study endosperm fragmentation and degree of protein displacement in flours from different wheats and different milling processes and to study the effects of pre-milling treat- ments of wheat on endosperm fragmentation during subsequent milling. In one instance study of the Bahco results led to the unexpected discovery of a substantial non-uniformity of protein distribution within the endosperm of high-protein hard wheat which may have far reaching implications.

ISSN:0037-9697    

DOI:10.1039/SA9690600096

出版商:RSC    

年代:1969

数据来源: RSC

摘要:

98 PYROLYTIC GAS CHROMATOGRAPHY [Proc. SOC. Analyt. Chem . Pyrolytic Gas Chromatography The following are summaries of some of the papers presented at a Joint Meeting of the Midlands Section and the Special Techniques Group with the East Midlands Section of the ICoyal Institute of Chemistry and the Nottingham Section of the Society of Chemical Industry held on March 12th 1969 and reported in the April issue of Proceedings (p. 56). Pyrolysis - Gas Chromatography in the Vapour Phase BY S. G. PERRY (Esso Petvoleurn Co. Ltd. Esso Research Centre Abingdon Bevkshive) THE development of analytical pyrolysis and its coupling with gas chromatography was very briefly traced and the range of materials to which it had been effectively applied indicated. It was noted that although application to synthetic polymers was the predominant field oi use the examination of natural products and the investigation of kinetic and mechanistic aspects of thermal degradation were also important.The paper was concerned principally with pyrolysis of samples in the vapour phase particularly of separated components emerging from a gas-chromatographic column. The object of pyrolysing such materials was to identify them specifically by determining the product distribution in the pyrolysate. The analogy between this process and rnass-spectro- metric analysis had led to vapour-phase pyrolysis - gas chromatography being referred to as “poor man’s mass spectrometry.” Simple examples were given of the use of vapour-phase pyrolysis - gas chromatography to reveal structural features of molecules and to differentiate between isomers.Temperature residence time sample size and the possibility of catalysis were cited as principal factors that might affect the product yield in the vapour-phase pyrolysis of volatile organic substances. He had demonstrated that temperature and residence time affected degree of conversion but not the product distribution whereas sample size influenced the distribution while conversion was little affected. The construction material of the pyrolysis tube affected the degree of degrada- tion of organics to carbon and product yield by pyrolysis in the carbonised tube often differed significantly from that in a clean tube. Gold appeared to be the preferred construction material. It was noted that recent work had confirmed that the well established ability of vapour- phase pyrolysis - gas-chromatographic technique to identify hydrocarbons extended also to a wide variety of other organic substances and that although no commercial equipment for it was yet available the technique could be considered to be proved.The speaker concluded with a reference to the need for standardisation not only of the presentation of pyrolysis - gas chromatography data but also of the pyrolysis and the gas- chromatographic techniques. Present collaborative efforts towards the latter goals were referred to sponsored by the Gas Chromatography Discussion Group’s pyrolysis - gas chroma- tography Sub-group. The work of Cramers on these matters was summarised. The Scope and Limitations of Polymer Pyrolysis BY C. E. ROLAND JONES PYROLYSIS - gas chromatography in contrast to many other forms of instrument analysis displays a certain specificity.This discriminative power has ensured the acceptance of the technique as a fairly simple direct method for obtaining a chromatographic fingerprint of the products of the thermal degradation of a high polymer. The characteristic patterns or “pyrogranis” are on occasion by no means infallible and the lack of definition between for example copolymers of vinyl acetate - octyl acrylate vinyl acetate - di-octyl fumarate and vinyl acetate - di-octyl maleate illustrates the need to resort to other means for corroboratory evidence; in this particular case nuclear magnetic resonance has much to offer. ( V i n y l Products Ltd. Carshalton Surrey) June 19691 PYROLYTIC GAS CHROMATOGRAPHY 99 The extension of pyrolysis - gas chromatography to embrace quantitative as well as qualitative procedures led to some interesting conclusions.Pyrolysis of a series of copolymers containing either styrene or methyl methacrylate together with a specie whose homopolymer exhibited random degradation behaviour as opposed to a predictably regular depolyrnerisation process common to the homopolymers of the two named monomers revealed disturbing anomalies. These events were subsequently explained by the postulate that for example the styrene units adjacent to alien units in the backbone were impeded and in consequence degraded in a non-predictable manner. The contrasting behaviour of block and random copolymers containing similar amounts of styrene and hutadiene is graphic demonstration of the phenomenon. Further examples were cited in which there was a possibility of correlating the thermal degradation behaviour with the reactivity ratios of the relevant pairs of monomers and the physical properties of the particular copolymers.Finally it was suggested that cognisance of a polymer’s history could materially assist the interpretation of its degradation behaviour. Pyrolysis - Gas Chromatography of Biological Macromolecules Ku M. v. STACK THIS review emphasises the importance of the technique in the field of cellulose flammability. Cracking is explained in terms of the formation of carbonium ions which decompose to form unsaturated cornpounds characterised by aldehyde and enol groups. Decomposition via kvoglucosan may not be the only pathway. Higher yields of furfural have been obtained from pyrolysis of glucose and cellulose than from Izevoglucosan itself according to Kato and K0morita.l They have recently shown that 100 per cent.microcrystalline cellulose requires heating 3 to 4 times longer a t 240" C than an 80 per cent. microcrystalline tobacco cellulose in order to decompose comparable proportions. The degree of hydroxyethylation of starch molecules was shown by Han Tai Powers and Protzman2 to be related to the acetaldehyde yield obtained on pyrolysis at 400" C. Similarly Gokcen and Cates" were able to determine the proportions of acetyl propyl and butyl groups in commercial cellulose esters by separating the acids by pyrolysis at higher temperatures. Simple mixtures of carbohydrate and protein can sometimes be identified by pyrolysis although both produce a complex variety of smaller molecules.The difficulty is increased by the possibility of quenching effects of the pyrolysis products of components upon each other. Gokcen and Cates3 draw attention to this feature in the field of identification of proportions of fibres. Products of wool and cotton pyrolysis were found to interact with those from Dacron in blends of natural and synthetic fibres. Much of the identifiable yield from mixtures of carbohydrate and protein arises from the protein when pyrolysis is applied to so-called taxonomic studies of micro-organisms4. Comparisons of this sort are unlikely to be valid unless the organisms are grown on the same medium. Order of linkage may be important in determining the products of protein pyrolysis judging by studies of peptides. Less emphasis on linkage was evident in the work of Simon and co-workersJ6 who used a ferromagnetic pyrolyser to crack microgram samples.Amino- acids decompose rnore readily when they have more than the definitive pair of functional groups according to Merritt and Robert~on,~ who claim that each amino-acid gives rise to a product unique in itself or constituting by €ar the most important product among those identified. Three types of result may be seen in the course of attempting to identify proteins by pyrolysis at low temperature (300" C) at which a considerable variety of separable products may be formed. The first possibility is exemplified by a comparison of collagen and gelatin for which the pyrograms cannot be differentiated. I n other cases of closely related proteins (e.g. elastin and p-elastin) the probability of differentiation cannot be demonstrated without an analysis of variance.But in the great majority of comparisons there is no difficulty in identification and differentiation. Clearly it is an advantage to have computerised assistance in pattern recognition as has been applied to chemotaxonomy by Reiner7 as well as by Oyama and C~irle.~ This would assist in forensic aspects such as those developed by Kirk* for the identification of hair etc. (M.R.C. 1)eyztal UniZ Uvziuevsily of l3vislol) 100 AUTOMATIC ANALYSIS [Proc. SOC. Afialyt. Chem. Quantitative pyrolysis has also been reported on the niicrograrri scale by Stanfords for bilirubin and the proportion of hzmatoporphyrin in a commercial protoporphyrin sample was determined to within 3 per cent.by Levy et aZ.1° from the ratio of ethanol to acetonitrile. Although these compounds are built up of pyrrole rings this feature does not seem to have been of importance in their pyrolysis. However pyrrole yields are distinctive in protein pyrolysis and have been used as reference compounds by several of the authors quoted. This type of degradation product accounts for half the signal area in collagen pyrolysis and has been used in semi-quantitative evaluation of the degree of mineralisation of bone and dentine. Practical considerations in this type of analysis should include the use of very small samples a ferromagnetic pyrolyser and very wide programming of the gas chromatograph for which the polyester separatory phases have been popular. The coupling of a system of this type with mass spectrometer and computer facilities leads to an analytical technique of considerable power. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. REFERENCES Kato K. and Komorita H. Agvic. Biol. Chew. Tokyo 1968,32 21. I-Ian Tsi I’owers I<. M. and Protzman ‘1. F. Annlyt. Chem. 1964 36 108. Gokcen U. and Cates I). M. Appl. Polym. Symposia 1966 No. 2 15. Oyama V. f . and Carle G. C. J . Gas Chvowzat. 1967 5 151. Merritt C. jun. and Robertson D. H. Ilbid. 1967 5 96. Simon W. Kriemler P. Voellmin J. A. and Steiner II. Ihid. 1867 5 53. Reiner E. Ihid. 1867 5 66. Kirk 1’. I,. l h i d . 1967 5 11. Stanford 1;. G. Analyst 1965 90 266. Levy R. L. Gcsscr H. Halevi E. A and Saidman S. .I. Gas Chvomut. 1964 2 254.

ISSN:0037-9697    

DOI:10.1039/SA9690600098

出版商:RSC    

年代:1969

数据来源: RSC

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100 AUTOMATIC ANALYSIS [Proc. SOC. Afialyt. Chem. Automatic Analysis The following is a summary of tlie paper presented at a Joint Meeting of the North of England Section with the Leeds University Union Chemical Society held on March 21 st 1969 and reported in the April issue of PYoceediutgs (p. 55). Automatic &Sampling and Analysis RY A. C. DOCHERTY (Impevial Chemical lvlduslvies Limited Agviculluixal D i v i s i o ~ P.0. Rox No. 6 Billingham Tl’eesside) AN automatic sampling system was described that had been developed for use on a fertiliser plant. It consists of Geco sampler; Tyler sample divider; Mettler automatic dispensing balance ; and Technicon Solidprey unit. By this means an aqueous solution of known con- centration is obtained which can then be analysed for nitrogen phosphate and potassium- the normal constituents of most fertilisers-quite automatically by using a Technicon Auto- Analyzer system.Phosphate is analysed colorirnetrically by the molybdate - vanadate reagent ainrnoniacal nitrogen by the indophenol colorimetric method and potassium by a modification of the tetraphenyl borate method in which the excess of sodium tetraphenyl borate reagent which remains after filtering off the precipitate of potassium tetraphenyl borate is determined by its ultraviolet absorption at 254 mi. If nitrogen is present as nitrate it is first reduced to ammonia with hypovanadous sulphate reagent. Urea-nitrogen is determined separately with tlie paradimethylaniinobenzaldehyde reagent. The method described is successful only because the product is essentially soluble in water.If however another solvent was necessary this would involve more difficulties. An example is analysis for moisture which is determined by the use of the Fischer reagent ; for moisture determina- tion only an automatic laboratory Fischer apparatus has so far been devised (manufactured by Townson and Mercer Limited and under licence from T.C.I.). June 1'3691 PAPERS iZCCEPTEI) FOR THE ANALYST 101 Ideally of course it would be preferable to analyse such products without removing them from the conveyor belt but this proves to be very difficult. This is not because of the lack of any physical effects that may be used to detect moisture potassium nitrogen or phosphate but because of the difficulty in knowing what weight of solid is related to the physical effect observed. Gases can be measured by their pressure and liquids by their density but with granular solids it appears that for precise work it is still necessary to abstract a sample and weigh it before carrying out the analysis. In some cases the analytical problem is comparatively simple and what makes the job difficult are the many samples that have to be handled. Such a situation arose recently when the new potassium deposits in North Yorksliire were being investigated and large numbers of analyses for potassium were required at very short notice. In this case the bulk of the work of calculation was handled by a computer and by this means what might have been rather a dull task became an interesting technical project.

ISSN:0037-9697    

DOI:10.1039/SA9690600100

出版商:RSC    

年代:1969

数据来源: RSC

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June 1‘3691 PAPERS iZCCEPTEI) FOR THE ANALYST 101 Papers Accepted for Publication in The Analyst r - HE following papers have been accepted for publication in Tlze Analyst and are espected to appear in the near future. “Indicator-tube Method for the Determination of Benzene in Air,” by 1’. Koljkowsky. “Determination of the Nitrogen Content of Uranium Mononitride by Alldine Fusion and Ammonia Distillation,” by W. 0. Greenhalgh. “The Automatic Determination of Original Gravity of Beer. Part 111. Automatic Sensing of Peaks and Calculation of Kesults,” by R. Sawyer E. J . .Johnston and E. Dixon. “Dual Column and Derivative Techniques for Improved Specificity of Gas - Liquid Chromatographic Identification of Organochlorine Insecticide Residues in Soils,” by H. B. Pionke G. Chesters and D. E.Armstrong. “The Use of a High Temperature Hollow-cathode Lamp for the Spectrophotographic Analysis of Steels High Temperature Alloys and Related Materials for Trace Elements,” by K. Thornton. ‘‘Emission Spectra obtained from the Combustion of Organic Compounds in Hydrogen Flames,” by R. M. Dagnall D. J. Smith K. C. Thompson and T. S. M’est. Gas-chromatographic Determination of Organohalogen Impurities in Dichlorofluoro- methane,” by D. B. Ratcliffe and B. H. Target. “The Spectrographic Analysis of Steelmaking Slag by a Compaction Method of Sample Preparation,” by P. S. Branihall and P. H. Scholes. “Determination of Tin in Geological Material by Neutron-activation Analysis,” by 0. Johansen and E. Steinnes. “ Pre-concentration of Carbonyl Compounds from their Medium Followed by Polarographic Determination of their Azomethine Derivatives,” by M. 1). Booth and It. Fleet. “Quantitative Analysis for Enantiomeric Purity of Secondary Alcohols b). Fluorine-19 Magnetic Resonance Spectroscopy,” by K. Konishi Y. Mori and N. Tanguchi. “A Method for the Determination of Lead in Blood by 14tomic-absorption Spectro- photometry,” by P. P. Donovan and D. T. Feeley. “Atomic-absorption Determination of Strontium in a Standard Plant Material Comment on Results of Inter-laboratory Comparison,” by D. J. David. “A Simple Method for the Purification of Brilliant Green Reagent for Antimony,” by G. 0. Kerr and G. K. E. C. Gregory. “The Determination of Trace Amounts of Calcium in Stainless Steels by Solvent Extraction Followed by Atomic-absorption Spectrophotometry,” by J. B. Headridge and J. Richardson. “The Dialysis of Small Volumes of Fluid,” by N. G. Heatley.

ISSN:0037-9697    

DOI:10.1039/SA9690600101

出版商:RSC    

年代:1969

数据来源: RSC

摘要:

102 PUBLICATIONS RECEIVED [Pvoc. SOC. Analyt. Chew$. Notices Developmeiit of an International Chemical Iiiforiiiation Service THE American Chemical Society and The ChemicaI Society (London) have taken what may be the first step towards building an international computer-based network for chemical informa- tion. Under an agreement approved by the ACS Board of Directors and the Council of The Chemical Society The Chemical Society has acquired exclusive rights to distribute the publications and computer services of the Chemical Abstracts Service in the United Kingdom. In return The Chemical Society will work to extend the applications of CAS computer-based information services in the U.K. and will develop a system of processing data from the British journal and patent literature for input to the CAS system.The Chemical Society in the agreement is acting for the 1J.K. Consortium on Chemical Information which also includes The Royal Society The Royal Institute of Chemistry The Society of Chemical Industry The Faraday Society The Society for Analytical Chemistry The Biochemical Society The Institution of Chemical Engineers The Chemical Industries Association and Aslib. The terms of the agreement give The Chemical Society both the exclusive right to market in the U.K. all current CAS publications and services and the right to utilise CAS computer systems and files to develop specialised publications and services of its own for sale or distri- bution. June 19691 NOTICES 103 THE CHEMICAL SOCIETY’S LIBRARY MEMBERS of the Society have the privilege of using the Library of the Chemical Society at Burlington House London WIV OBN.The following publications of analytical interest have been added to the Library since the last list appeared in Proceedings (1968 5 250). 1968 BOOK OF ASTM STANDARDS WITH RELATED MATERIAL. American Society for Testing ADVANCES IN INFRARED GROUP FREQUENCIES. L. J. BELLAMY. Methuen. 1968. MANUAL OF SAMPLING AND ANALYSIS. SECTIONS 7 8 9. VOLUME 1. Central Electricity Research Laboratories. 1969. DECOMPOSITION TECHNIQUES IN INORGANIC ANALYSIS. Translated from the Czech. J. DOLEZAL P. POVONDRA AND 2. SULCEK. Iliffe. 1969. CHEMICAL APPLICATIONS OF MOSSBAUER SPECTROSCOPY. Edited by V. 1. GOLDANSKII and R. H. HERBER. Academic Press. 1968. MOSSBAUER EFFECT METHODOLOGY. Edited by J. I. GRUVERMAN. VOLUME 4. Proceedings of the Fourth Symposium on Mossbauer Effect Methodology Chicago 1968.Plenum Press. PRACTICAL POLAROGRAPHY AN INTRODUCTION FOR CHEMISTRY STUDENTS. J. HEYROVSKY and P. ZUMAN. Academic Press. 1968 PROGRESS IN COORDINATION CHEMISTRY. International Conference on Co- ordination Chemistry. Haifa and Jerusalem. 1968. Elsevier. 1968. INORGANIC ELECTRONIC SPECTROSCOPY. A.B.P. LEVER. Elsevier. 1968. SILYLATION OF ORGANICOMPOUNDS A TECHNIQUE FOR GAS-PHASE ANALYSIS. Pierce KIRK-OTHMER ENCYCLOPEDIA OF CHEMICAL TECHNOLOGY. Edited by A. STANDEN. Second Edition. AUTOMATION IN ANALYTICAL CHEMISTRY TECHNICON SYMPOSIA. Technicon Corpora- PART 23. Materials. 1968. 1968. Edited by MICHAEL CAIS. A. E. PIERCE. Chemical Co. 1968. Volume 17. Interscience. 1968. tion. New York and Brighton. 1967. Mediad Inc. 1968. VOLUMES I AND 11.INTERNATIONAL UNION OF PURE AND APPLIED CHEMISTRY Information Bulletin Number 34 April 1969 THE bulletin includes details of the Tentative Specifications for the Measurement and Evalua- tion of Infrared Spectra for Documentation Purposes prepared by the IUPAC Commission on Molecular Structure and Spectroscopy Physical Chemistry Divisions ; Revision of Red Book Nomenclature for Rerthollides prepared by the Commission on the Nomenclature of Inorganic Chemistry; and the Reports of the Terminal Residues Commission and the Com- mission on Development Improvement and Standardization Methods of Pesticide Residue Analysis. The IUPAC information bulletin No. 34 April 1969 can be obtained from Rutterworth Scientific Publications London (price not yet available). BRITISH STANDARDS INSTITUTION DRAFT SPECIFICATION A FEW copies of the following draft specification issued for comment only are available to members of the Society and can be obtained from the Secretary The Society for Analytical Chemistry 9-10 Savile Row London WIX 1AF. Draft Specification prepared by Panel C/37/1/1-Analysis of Water Used in Steam Generation. Part 10 Sodium 69/10799-Draft B.S. Methods for Testing Water Used in Industry. Potassium and Lithium (Metric Units) (Revision of BS 2690).

ISSN:0037-9697    

DOI:10.1039/SA969060102b

出版商:RSC    

年代:1969

数据来源: RSC

摘要:

104 THE SOCIETY FOR ANALYTICAL CHEMISTRY Announcements For the analyst. . Grant Instruments Ltd. Barrington Cambridge have introduced the Thermoscan differential scanning calorimeter. With this instrument both quantitative and qualitative thermal analyses are possible. Differential scanning calorimetry is a rela- tively new technique that may supercede qualitative differential thermal analysis. The design of the Thermoscan provides accuracy (1 to 2 per cent.) in an instrument that is inexpensive robust and simple to operate. This has been made possible by heating by focused radiation. The instrument operates up to 400” C and has six scanning rates between 1” and 32” C minute-I. In line with the need for simplicity Grant have utilised the module principle to facilitate servicing and maintenance work.A new reflecting beam condenser from KIIC the C621 has a condensing factor of 6 x and transmission of about 70 per cent. or better through a 0.5 x 3-mm aperture. Unlike refracting condensers there is no wavelength restriction and the aluminium-coated glass mirrors are not prone to fogging under atmos- pheric conditions. A fully adjustable cell holder takes a variety of accessories including micro-liquid cells micro-gas cells solids holders and a micro-reflectance unit for study of specular rellectance and measuring the thickness of epitaxial and similar films. Descriptive brochures are available from Research and Industrial Instruments Company Worsley Bridge Kd. London S.E.26. Koch-Light Laboratories Ltd. announce a second book in their series dealing with Liquid Scintillation Counting by I>r.J. B. Uirks. The first book written by Dr. Birks for Koch- Light was entitled “An Introduction to Liquid Scintillation Counting.” This second book “Solutes and Solvents for Liquid Scintillation Counting” considers in more detail the factors involved in the choice of liquid organic solution scintillators. This publication is availablc free of charge upon request t o Koch-Light Labora- tories Ltd. Colnbrook Bucks. The Association of Consulting Scientists consists of independent full-time consultants practising in all branches of science and technology. All members are scientists of long standing and experience and maintain laboratories for sponsored research and analytical purposes. The objects of the ACS are infsv alin to operate a clearing bureau for enquiries for independent scientific services; to promote research by con- tract with sponsors; to offer facilities for con- ferring with and ascertaining the collective views of consulting scientists ; and to establish recognised standards of conduct among consult- ing scientists. Copies of a new ACS membership list (out- lining the main fields of work undertaken by each member) are now available. The list will be sent free of charge on receipt of a request on a bona fide letter heading accompanied by a large stamped addressed envelope to The Association o€ Consulting Scientists 2 Howard Street Strand London W.C.2.

ISSN:0037-9697    

DOI:10.1039/SA9690600104

出版商:RSC    

年代:1969

数据来源: RSC