ANALAO 104 (I 234) 1-96 (1 979)ISSN 0003-2654January 1979THE ANALYSTTHE ANALYTICAL JOURNAL OF THE CHEMICAL SOCIETYCON'I'ENTS1 REVIEW. Extractions and Separatioms w i t h Foamed Plastics and Rubbers-G. J. Moody and J. D. R. Thomas16 Evaluation o f a Method f o r Determination o f Total Antimony, Arsenic and Tin inFoodstuffs Using Measurement by Atomic-absorption Spectrophotometrywith Atomisation in a Silica Tube Using the Hydride Generation Technique-W. H. Evans, F. J. Jackson and Dorothy Dellar35 Determination o f Germanium, Arsenic, Selenium, Tin and Antimony in ComplexSamples by Hydride Generation - M icrowave-induced Plasma Atomic-emission Spectrometry-Wayne El. Robbins, Joseph A. Caruso and Fred L. Fricke41 Determination o f Micro-amounts of Polythionates.Part XI. Spectrophoto-metric Determination o f Two Species o f Polythionates in Their Mixtures byCyanolysis and Solvent Extractialn-Tomozo Koh, Yuzi Aoki and lwaji lwasaki47 Determination o f Ammonia in Low Concentrations with Nessler's Reagent byFlow Injection Analysis-F. J. Krug, J. RGiCka and E. H. Hansen55 Determination o f Chloride in High-purity Waters in the Range 0-20 pg 1-1 ofChloride Using lon-selective Mernbrane Electrodes Incorporating Mercury( I )Chloride-G. B. Marshall and D. Mi,dgley63 Assessment of Glass Electrodes.for Determining pH in Boiler Feed Water-D. Midgley and K. Torrance73 Polarographic Study of Aflatoxins B,, B2, G, and G2: Application o f Differential-pulse Polarography' t o the Determination o f Aflatoxin B1 i n Various Food-stuffs-Malcolm R. Smyth, David W. Lawellin and Janet G. OsteryoungSHORT PAPERSDetermination o f S-Methylmethionirre in Plant Products by Use o f an Automatic 79Amino-acid Analyser-E. G. Kovatcheva82 Determination o f Bifunctional Compounds. Part IV. 4-lodobutaneboronicAcid as a Selective Reagent for the Trace Determination o f BifunctionalCompounds-C. F. Poole, S. Singhawangcha and A. Zlatkis87 Spectrophotometric Determination o f Silver with Ammonium 2-Cyano-3-iminodithiobutyrate-Motomu Muraoka, Tatsuo Yamamoto and Tatsuo Takeshima91 Book ReviewsSummaries o f Papers in this Issue-IPages iv, v, viii, ix.Printed by Heffers Printers Ltd Cambridge EnglandEntered as Second Class # 3 t New York. USA, Post Offic