ANALAO 112(1) 1-112 (1987)The AnalystJanuary 1987The Analytical Journal of The Royal Society of ChemistryCONTENTS117Directly Coupled Chromatography - Atomic Spectroscopy. Part 2. Directly Coupled Liquid Chromatography - AtomicSpectroscopy. A Review-Les Ebdon, Steve Hill, Robert W. WardDi- and Tributyltin Species in Marine and Estuarine Waters. Inter-laboratory Comparison of Two Ultratrace AnalyticalMethods Employing Hydride Generation and Atomic Absorption or Flame Photometric Detection-Aldis 0.Valkirs, Peter F. Seligman, Gregory J. Olson, Frederick E. Brinckman, Cheryl L. Matthias, Jon M. BellamaDetermination of Scandium in Coal Fly Ash and Geological Materials by Graphite Furnace Atomic AbsorptionSpectrometry and Inductively Coupled Plasma Atomic Emission Spectrometry-M.Bettinelli, U. Baroni,N. Pastorelli27 Multi-element Pre-concentration by Solvent Extraction Compatible with an Aqua Regia Digestion for GeochemicalExploration Samples-Ivan Rubeska, Benilda Ebarvia, Edita Macalalad, Dahlia Davis, Nenita Roque31 Analytical Reference Materials. Part VI. Development and Certification of a Sediment Reference Material for SelectedPolynuclear Aromatic Hydrocarbons-Hing-Biu Lee, Geeta Dookhran, Alfred S. Y. Chau37 Analytical Reference Materials. Part VII. Development and Certification of a Sediment Reference Material for TotalPolychlorinated Biphenyls-Hing-Biu Lee, Alfred S. Y. Chau41 Determination of Uranium(V1) in Process Liquors by Ion Chromatography-John J. Byerley, Jeno M. Scharer, George F.Atki nson45 Gas Chromatographic Determination of Acrolein in Rain Water Using Bromination of 0-MethyloximeHarumitsuNishikawa, Tomokuni Hayakawa, Tadao Sakai49 Simple Gas Chromatographic Determination of the Distribution of Normal Alkanes i n the Kerosene Fraction ofPetroleum-Suresh C.Vishnoi, Shiv D. Bhagat, Vidya B. Kapoor, Sneh K. Chopra, Rajamani Krishna53 Determination of Polychlorinated Biphenyls in Waste Oil by Gas - Liquid Chromatography-Richard E. Lawn, Shaun A.ToffeI57 Simultaneous Measurement of Phenobarbital, Carbamazepine, Phenytoin and 5-(4-Hydroxyphenyl)-5-phenylhydan-toin in Serum by High-performance Liquid Chromatography-Siraj A. Mira, Yousry M. El-Sayed, Samira I. Islam61 Lithium Ion-selective Electrodes Containing TOPO: Determination of Serum Lithium by Flow Injection Analysis-Robert Y.Xie, Gary D. Christian65 Chemically lmmobilised Bi-enzyme Electrodes in the Redox Mediated Mode for the Flow Injection Analysis of Glucoseand HypoxanthineG. J. Moody, G. S. Sanghera, J. D. R. Thomas71 Determination of Free Hydrofluoric and Nitric Acids in Pickling Bath Liquors Using a Fluoride-selective Electrode andAlkalimetric Titration-Kaj Lindroos75 Spectrophotometric Determination of Carbaryl and Propoxur Using Aminophenols and PhenylenediamineC. S. P.Sastry, D. Vijaya, D. S. Mangala79 Determination of iorazepam by Fluorimetric and Photochemical - Fluorimetric Methods-Jesus Rodriquez Procopio,Pedro Hernandez Hernandez, Lucas Hernandez Hernandez83 Selective Photometric Titration of Calcium or Magnesium with EDTA Using Various Thiols as Masking Agents-ColinG. Halliday, Michael A. Leonard87 Turbidimetric Determination of Chlorhexidine Using Flow Injection Analysis-J. Martinez Calatayud, P. Campins Falc6,A. Sanchez Sampedrc91 A New Type of Argon lonisation Detector-S. A. Beres, C. D. Halfmann, E. D. Katz, R . P. W. ScottSHORT PAPERS97 Diazotised 4-Nitroaniline as a Chromogenic Reagent for the Determination of Trace Amounts of Pyrrole in Aqueous101 Spectrophotometric Determination of Dobutamine Hydrochloride Using 3-Methylbenzothiazolin-2-one H y d r a z o n e105 SOFTWARE REVIEW106 BOOK REVIEWS109 INSTRUCTIONS TO AUTHORS23Solution-Ahmad K. Ahmad, Younis I. Hassan, Wadala A. BashirMichael E. El-KommosTypeset and printed by Heffers Printers Ltd, Cambridge, Englan