ANALAO 1 1 l(2) 129-264 (1 986)The AnalystFebruary 198612913313914515115716316717117517918318919319720120520921 321 7221225227231The Analytical Journal of The Royal Society of ChemistryCONTENTSDetermination of Hydroquinone in Skin-toning Creams Using High-performance Liquid Chromatography-Jane Firth,Ian RixStability-indicating Assay for Oxyphenbutazone. Part II. High-performance Liquid Chromatographic Determination ofOxyphenbutazone and Its Degradation Products-Huguette Fabre, Andrianandrasana Ramiaramana, Marie-Do m i n iq ue B I a nc h in, Bernadette Ma nd ro uPrevention of Artifactual Formation of Nitrosamines During the Analysis of Baby Bottle Rubber Nipples-Nrisinha P.Sen, Stephen W. Seaman, Santosh C.KushwahaGas Chromatographic Determination of Triclopyr in Environmental Waters-Tadashi Tsu kioka, Ryuzo Takeshita,Tetsu ro M ura kamiPreparation of a Chloride-selective Electrode Based on Mercury(1) Chloride - Mercury(l1) Sulphide on an ElectricallyConductive Epoxy Support-J. L. F. C. Lima, A. A. S. C. MachadoReduction in Size by Electrochemical Pre-treatment at High Negative PoYentials of the Background Currents Obtainedat Negative Potentials at Glassy Carbon Electrodes and Its Application in the Reductive Flow InjectionAmperometric Determination of Nitrofurantoin-Ahmad 8. Ghawji, Arnold G. FoggDetermination of Vitamin C by Flow Injection Analysis-Fernando Lazaro, Angel Rios, M. D. Luque de Castro, MiguelVa lcarcelDetermination of Vitamin C in Urine by Flow Injection Analysis-Fernando Lazaro, Angel Rios, M.D. Luque de Castro,Miguel ValcarcelFlow Injection - Hydride Generation System for the Determination of Arsenic by Molecular Emission CavityAnalysis-M. Burguera, J. L. BurgueraDetermination of Sulphur, Phosphorus, Magnesium, Silicon and Aluminium in Washing Powders by X-RayFluorescence Spectrometry-Joh n Wil hamsDetermination of a-Impurities ir the fi-Polymorph of lnosine Using Infrared Spectroscopy and X-ray PowderDiffraction-David H. Doff, Frank L. Brownen, Owen I. CorriganContinuous Spectrophotometric Monitoring of Chlorine in Air-Aviva Shina, J. GabbayMorpholine as an Absorbing Reagent for the Determination of Sulphur Dioxide-V. Raman, J. Rai, M. Singh, D. C.Kinetic - Catalytic Determination of Cobalt by Oxidation of Pyrogallol Red by Hydrogen PeroxideM.Llobat-Estelles,Effect of Anion-exchange Resin on the Formation of Iron(ll1) - Tiron Complexes-Mohamed M. A. Shriadah, KunioMulti-component Quantitative Analysis of Fluorescent Mixtures Not Obeying Beer’s Law-A. T. Rhys Williams, R. A.Minimisation of Bilirubin Interference in the Determination of Fluorescein Using First-derivative SynchronousNovel Aryl Oxalate Esters for Peroxyoxalate Chemiluminescence Reactions-Kazuhiro Imai, Hiroyoshi Nawa, MotoakiAccurate Determination of Platinum, Palladium, Gold and Silver in Ores and Concentrates by Wet Chemical Analysis ofGravimetric Determination of Iron by Precipitation as the [(C,H,),N],[Fe(SCN),] Ion Pair-J. Hernandez Mendez,ParasharA.Sevillano-Cabeza, J. Medina-Escriche0 hze kiSpraggExcitation Fluorescence Spectroscopy-Frank V. Bright, Linda 8. McGownTana ka, H iroshi Og atathe Lead Assay Button-Andreas DiamantatosA. Alonso Mateos, E. J. Martin MateosSHORT PAPERSSize Distribution of Particulate Matter in Exhaust Gases in Inductively Coupled Ptasma Atomic EmissionSpectrometry-J. Alwyn Davies, Adrian C. JefferiesSequential Determination of Arsenic, Antimony and Bismuth in Low-alloy Steels by Hydride Generation InductivelyCoupled Plasma Atomic Emission Spectrometry-Stephen J. WaltonDetermination of Rock-forming Elements in the Presence of Large Amounts of Uranium in Zirconium Using InductivelyCoupled Plasma Atomic Emission Spectrometry-Irene Gal, Ludwik HaliczComparison Between lsobutyl Methyl Ketone and Diisobutyl Ketone for the Solvent Extraction of Gold and ItsDetermination in Geological Materials Using Atomic Absorption Spectrometry-Charles H.Branch, DawnHutchisoncontinued inside backcoverElectronically typeset and printed by Heffers Printers Ltd, Cambridge, Englan235 Study of the Fluorescence of the Lead - Morin System in the Presence of Non-ionic Surfactants-J. Medina,F. Hernandez, R. Marin, F. J. Lopez239 Thin-layer Chromatographic Separation and Determination of Dibutylphosphoric Acid in a Mixture of Monobutyl-phosphoric Acid and Tributyl Phosphates. C. Tripathi, A. Ramanujam, M. N. Nadkarni, C. Bandyopadhyay241 Extraction and Gas Chromatographic Determination of Residual Formaldehyde in Micro-surgical Materials-AntonellaProfumo, Maria Pesavento243 Diazotised Sulphanilic Acid as a Spectrophotometric Reagent for the Determination of Trace Amounts of lndole inAqueous Solution-Ahmad K.Ahmad, Younis I. Hassan, W. A. Bashir245 Selective Spectrophotometric Kinetic Determination of Cobalt with o-Hydroxyphenylthioure-s. J. Rao, G. S. Reddy,J. K. Kumari, Y. K. Reddy247 Spectrophotometric Determination of Selenium(lV) with Potassium Butyl Xanthate-Nepal Singh, Arvind K. Garg249 Oxidative Amperometric Flow Injection Determination of Oxalate at an Electrochemically Pre-treated Glassy Carbon253 Z’-Mercapto-4-propylacetanilide: an Alternative t o Thionalide for Precipitating Lead from Weak Acid Solution-John255 Titrimetric Determination of Catecholamines and Related Compounds via Bromine Oxidation and Substitution-Electrode-Arnold G.Fogg, Rosa M. Alonso, Miguel A. Fernandez-ArciniegaC. Burridge, Irene J. Hewitt, Hamish A. AndersonDarwish AminCOMM U NlCATlON259 Supported Chemoreceptive Lipid Membrane Transduction by Fluorescence Modulation: the Basis of an IntrinsicFibre-optic Biosensor-Ulrich J. Krull, Chrisula Bioore, Gareth Gumbs263 BOOK REVIEWSERRATUM264 Automatic Two-stage Thermal Desorption Gas Chromatography for Low-volatility Organic Vapour Determination-J. F. Alder, E. A. Hildebrand, J. A. W. SykesThe 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 aria 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 ANALYSED SAMPLES LTDfor a copy of their list ofOVERSEASREFERENCE MATERIALSproduced byAECAN (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 BASRIDA201 for further information. See page iv