ANALAO 121(1) 1R-IOR, 1-94, 1N-16N (1996) JANUARY 1996IGUEST EDITORIAL 1NEDITORIAL 3NREVIEWS1RIllSAMPLE HANDLING1713ATOMIC SPECTROSCOPY/SPECTROMETRY1931MOLECULARSPECTROSCOPY/SPECTROMETRY374349SEPARATION SCIENCE5561B I 0 AN A LY T I C A L6771ELECT R 0 AN A LYTl C A L7579~ '"An a I y stThe analytical journal of The Royal Society of ChemistryCONTENTSJ. N. MillerHarp MinhasMethods for the Determination of fi-Agonists in Biological Matrices-A Review-Damien Boyd, MichaelO'Keeffe, Malcolm R. SmythContinuous-flow Method for the Determination of Phenols at Low Levels in Water and Soil LeachatesUsing Solid-phase Extraction for Simultaneous Preconcentration and Separation-Zheng-hang Zhi, AngelRios, Miguel ValcarcelDetermination of Trace Amounts of Cadmium in a Hydrometallurgical Zinc Refining Process Stream by aFlow-injection Method With On-line Preconcentration and Spectrophotornetric Detection-YutakaHayashibe, Yasumasa SayamaSpeciation of Nitrogen in Wastewater by Flow Injection-A.Cerda, M. T. Oms, R. Forteza, V. CerdaDetermination of Methylmercury in Sediments Using Supercritical Fluid Extraction and GasChromatography Coupled With Microwave-induced Plasma Atomic Emission Spectrometry-HAkanEmteborg, Erland Bjorklund, Fredrik Odman, Lars Karlsson, Lennart Mathiasson, Wolfgang Frech,Douglas C. BaxterDetermination of Ultra-trace Amounts of Selenium(iv) by Flow Injection Hydride Generation AtomicAbsorption Spectrometry with On-line Preconcentration by Co-precipitation with Lanthanum Hydroxide.Part II.On-line Addition of Co-precipitating Agent-Steffen Nielsen, Jens J. Sloth, Elo H. HansenStudy of the Chemiluminescent Characteristics of Ninhydrin and its Application-Guo Nan Chen, Xue QinXu, Fan ZhangExistence of Two Basic Sites in Triazolo-l,4-diazepines: Determination of Two pK, Values for a ModelCompound in Water-Beatrice Legouin, Jean-Louis BurgotSensitive Peroxyoxalate Chemiluminescence Determination of Psychotropic lndole DerivativesduanaCepas, Manuel Silva, Dolores Perez-BenditoMicrobore Liquid Chromatography-Electrospray Mass Spectrometry of Selected Synthetic PyrethroidInsecticides-Ian A. Fleet, John J. Monaghan, Derek B. Gordon, Gwyn A. LordInvestigation of On-line Reversed-phase Liquid Chromatography-Gas Chromatography-MassSpectrometry as a Tool for the Identification of Impurities in Drug Substances-Elise C.Goosens, Karel H.Stegman, Dirk de Jong, Gerhardus J. de Jong, Udo A.Th BrinkmanEstablishing the Cut-off Concentration for the Detection of Etrophine in Horse Urine-Robert F. Smith,Laurence S. Jackson, Andrew MooreAmperometric Biosensor for the Determination of the Artificial Sweetener Aspartame With an lnirnobilizedBienzyme System-Shu-Fen ChouDetermination of Low Concentrations of Nickel and Aluminium in Membrane Electrolyser Liquors-MichaelCullen, Susan LancashireElectrochemical Trace Analysis of Gold in Ore-Jyotsna Shukla, K. S. PitreTHE ROYALC H EM I STRYInformationServices Cambridge, EnglandTypeset and printed by Black Bear Press Limited,Continued on inside back cover-0003-2654C199611:1-OTHER METHODS838993iVvi ixixivCertified Reference Materials (CRMs 479 and 480) for the Quality Control of Nitrate Determination inFreshwater-Ph. Quevauviller, M.Valcarcel, M. D. Luque de Castro, J. Cosano, I?. MoselloSensitive Determination of Nitrite Using its Catalytic Effect on the Bromate Oxidation ofProchlorperazine-Ashraf A. Mohamed, Mohamed F. El-shahat, Tsutomu Fukasawa, Masaaki lwatsukiCUMULATIVE AUTHOR INDEXINSTRUCTIONS TO AUTHORSGUIDELINES FOR SUBMISSION ON DISKIUPAC PUBLICATIONS ON NOMENCLATURE AND SYMBOLISMREFEREEING PROCEDURE AND POLICY (1996)COPYRIGHT LICENCENEWSANDVIEWS 5N7N11N12N13N15NBook ReviewsConference DiaryCoursesPapers in Future IssuesTechnical Abbreviations and AcronymsConference Report-Peter HarrowingCover picture: Determination of @-agonists in food samples using solid-phase extraction (see p. 1 R).Image kindly supplied by Michael O’Keeffe, The National Food Centre, Teagasc, Dublin, Ireland