ANALAO 111(1) 1-128 (1986)The AnalystJanuary 198613111519232937414549535761656973778187919597101105107The Analytical Journal of The Royal Society of ChemistryCONTENTSEditorial-P. G. W. CobbAutomated Potentiometric Titrations of Sulphides and Thiols in Petroleum Systems-S. W. Bateson, G. J. Moody,J. D. R. ThomasIndirect Determination of Cyanide in Waste Waters by Formaldehyde Chronopotentiometry-Jesus RodriguezProcopio, Jose-Maria Pinilla Macias, Lucas Hernandez HernandezSimultaneous Determination, by Hydride Generation and Inductively Coupled Plasma Atomic Emission Spectrometry,of Arsenic, Antimony, Selenium and Tellurium in Silicate Rocks Containing the Noble Metals and in SulphideOres-L. Halicz, G.M. RussellDetermination of Gallium in Phosphorus Flue Dust and Other Materials by Graphite Furnace Atomic AbsorptionSpectrometry-David C. Barron, Benjamin W. HaynesDetermination of Nitrogen-15 by Optical Emission Spectrometry Using an Atomic Absorption Spectrometer-MichaelH. Timperley, John C. PriscuStudies on the Determination of Mercury in Human Beard Shavings by Neutron-aaivation and y-Ray Analysis-J. G.Pritchard, S. 0. SaiedAutomated Determination of Fat, Crude Protein and Lactose in Ewe Milk by Infrared Spectrometry-Wendy M. HarrisUse of Orthogonal Polynomials for Unequal Intervals t o Eliminate Interference in Spectrophotometric Analysis.Simultaneous Determination of Ephedrine Hydrochloride and Diphenhydramine Hydrochloride in Two-component Mixtures-M.A. Korany, Mona Bedair, F. A. El-YazbiSpectrophotometric Determination of Some Anti-inflammatory Agents Using N-BromosuccinimideSonia T. Hassi b,Hany M. Safwat, Ramzeia I. El-BagrySilver(1) - Gelatin Interaction: Spectrophotometric Determination of Trace Amounts of Silver in Water-T. Pal, D. S.MaitySpectrophotometric Study of a Titanium (IV) - Peroxide - 1 -(2-Pyridylazo)-2-naphthol System in the Presence of aNon-ionic Surfactant-M. Llobat-Estelles, J. Medina-Escriche, A. Tomas-Primo, A. Sevillano-CabezaExtraction - Spectrophotometric Determination of Indium Using 4-(2-Pyridylazo)resorcinol-Yadvendra K. Agrawal,Vinay J. BhattRapid Spectrophotometric Determination of Chromium(ll1) with 2-(5-Bromo-2-pyridylazo)-5-diethylaminophenol inthe Presence of Benzoate and Sodium Dodecyl SulphateG.V. Rathaiah, M. C. EshwarSimultaneous Spectrophotometric Determination of Copper, Nickel and Palladium by Flow Injection Analysis-Ami nT. Haj-Hussein, Gary D. ChristianCatalytic Determination of Manganese at Ultra-trace Levels by Flow Injection Analysis-S. Maspoch, M. Blanco, V.CerdaDetermination of Trihalomethanes in Water Using Gas Syringe Injection of Headspace Vapours and Electron-captureGas Chromatography-Brian T. Croll, Margaret E. Sumner, David A. LeathardDetermination of Methoxy Groups in Soils by the Zeisel Method Combined with Gas - Liquid Chromatography-Alberto M. T. Magalhiies, Phillip M. ChalkAnalytical Reference Materials. Part V. Development of a Sediment Reference Material for Chlorobenzenes andHexachlorobutadieneHing-Biu Lee, Robert L.Hong-You, Alfred S. Y. ChauPorous Membrane-based Diffusion Scrubber for the Sampling of Atmospheric Gases-Purnendu K. Dasgupta, WilliamL. McDowell, Jae-Seong RheeSHORT PAPER§Simple and Precise High-performance Liquid Chromatographic Method for the Investigation of Carbodiimide-Elimination of Feed Additive Derived Interferences in the Assay for Avoparcin-H. L. Hatfield, A. ThomasSpectrophotometric Determination of Tetracycline with Sodium Molybdate-Salah M. SultanDetermination of Alkylnaphthalenes in Petroleum Fractions by Second-derivative Ultraviolet Spectrophotometry-Critical Comparison of X-ray Fluorescence and Combustion - Infrared Methods for the Determination of Sulphur inDetermination of 28 Elements in American Cigarette Tobacco by Neutron-activation Analysis-Felib Y.Iskander,mediated Peptide Synthesis-Marek Slebioda, Aleksander M. KotodziejczykLalji Dixit, Siya Ram, R. 6. Gupta, H. C. Chandola, Pradeep KumarBiological Matrices-Nathan W. Bower, Ernest S. Gladney, Roger W. FerenbaughThomas L. Bauer, Dale E. Kleincontinued inside backcoverElectronically typeset and printed by Heffers Primers Ltd, Cambridge, Englan111 Releasing Effect of Iron(ll1) and Other Oxidants on the Interference from Nickel in the Determination of Selenium by115 Rapid Determination of Tungsten in Alloys, Ores and Concentrates by Atomic Absorption Spectrometry-Sarala119 Titrimetric Determination of A2-Pyrazol-5-ones and A3-Pyrazol-5-ones via Bromination-Darwish Amin, Red ha I.Hydride Generation Atomic Absorption Spectrometry-Ragnar ByeRaoot, S.V. Athavale, T. H. RaoAl-Bayati121 BOOK REVIEWS125 INSTRUCTIONS TO AUTHORSThe Periodic Tableof the ElementsThe Royal Society of Chemistry has produced acolourful wall chart measuring 125cm x 75cmcovering the first 105 elements as they exist today.Each group is pictured against the same tintedbackground and each element, where possiblephotographed in colour and discussed with regardto its position in the hierarchy of matter. Additionalinformation for each element includes chemicalsymbol, atomic number, atomic weight and orbitsof electrons.The chart is particularly useful for both teachersand students and would make a worthwhileaddition to any establishment.Price: Non-RSC Members f3.00 including VATRSC Members f2.00 including VATTeacher Members f 12.00 for 10 including VATRSC members should send their orders to: TheRoyal Society of Chemistry, The MembershipOfficer, 30 Russell Square, London WClB 5DT.Non-RSC members should send their orders to:The Royal Society of Chemistry, DistributionCentre, Blackhorse Road, Letchworth, HertsSG6 IHN.Please contactBUREAU OF ANALYSEO SAMPLES LTOfor a copy of their list ofOVERSEASREFERENCE MATERIALSproduced byALCAN (Canada)BAM (W. Germany)CANMET (Canada)CKD (Czechoslovakia)CTIF (France)IRSID (France)NBS (USA)SABS (S. Africa)JERNKONTORET (Sweden)Please write, telephone or telex to:BAS Ltd., Newham Hall, Newby,Middlesbrough, Cleveland, TS8 9EATelephone: Middlesbrough (0642) 317216Telex: 587765 BASRIDr201 for further information. See page iv