ANALAO 120( 1 ) 1-230, 1 N-16N (1 995) JANUARY 1995EDITORIALSCRITICAL REVIEWAMC'""An a I y stThe analytical journal of The Royal Society of ChemistryCONTENTS1N The Analyst at 120-4 N. Miller2N Changes-Harp Minhas1 Methods for Assessing the Authenticity of Orange Juice-Kevin Robards, Michael Antolovich29 Internal Quality Control of Analytical Data-Analytical Methods Committee35 Routine Lead Isotope Determinations Using a Lead-207-Lead-204 Double Spike: a Long-term Assessmentof Analytical Precision and Accuracy-Jon. D. Woodhead, F. Volker, M. T. McCulloch41 Gas Chromatography-Negative-ion Chemical Ionization Mass Spectrometry of Hydrolysed Human Urineand Blood Plasma for the Biomonitoring of Occupational Exposure to 4,4'-Methylenebisaniline-PerBrunmark, Marianne Dalene, Gunnar Skarping47 Determination of Creatinine in Human Serum.Statistical lntercalibration of Methods-M. C. Gennaro, C.Abrigo, E. Marengo, C. Baldin, M. T. Martelletti53 Micellar Liquid Chromatography of Zwitterions: Retention Mechanism of Cephalosporins-Carmelo GarciaPinto, Jose Luis Perez Pavon, Bernard0 Moreno Corder063 1 -Methoxycarbonylindolizine-3,5-dicarbaldehyde as a Derivatization Reagent for Amino Compounds inHigh-performance Capillary Electrophoresis-Shigeyuki Oguri, Chikako Uchida, Yasuko Miyake,Yasuyoshi Miki, Kazuaki Kakehi69 Evaluation, Mechanism and Application of Solid-phase Extraction Using a Dithiocarbamate Resin for theSampling and Determination of Mercury Species in Humic-rich Natural Waters-HAkan Emteborg, DouglasC.Baxter, Michael Sharp, Wolfgang Frech79 Optimization of Atomization Parameters in the Speciation of Organotin Compounds by HydrideGenerationGas Chromatography-Electrothermal Atomic Absorption Spectrometry-P. M. Sarradin, F.Leguille, A. Astruc, R. Pinel, M. Astruc85 Determination of Trace Amounts of Phosphorus in Silicate Materials by Simultaneous Inductively CoupledPlasma Atomic Emission Spectrometry-F. J. Valle Fuentes, S. del Barrio Martin89 Atomic Absorption Spectrometric Determination of Copper and Lead in Silicon Nitride and Silicon Carbideby Direct Atomization-Toshihiro Nakamura, Yuji Noike, Yoshiyuki Koizumi, Jun Sato95 Comparison of Reflux and Microwave Oven Digestion for the Determination of Arsenic and Selenium inSludge Reference Material Using Flow Injection Hydride Generation and Atomic AbsorptionSpectrometry-Rajananda Saraswati, Thomas W.Vetter, Robert L. Watters, Jr.101 Determination of Cadmium and Lead in Vegetables After Activated-carbon Enrichment by AtomicAbsorption Spectrometry-Mehmet Yaman, Seref GuGer107 Rapid Determination of Calcium, Magnesium, Sodium and Potassium in Milk by Flame AtomicSpectrometry After Microwave Oven Digestion-Miguel Angel de la Fuente, Manuela Juarez1 13 Novel Disulfonated Tetrazolium Salt That can be Reduced to a Water-soluble Formazan and its Applicationto the Assay of Lactate Dehydrogenase-Munetaka Ishiyama, Kazumi Sasamoto, Masanobu Shiga,Yosuke Ohkura, Keiyu Ueno, Katsuhiko Nishiyama, lsao Taniguchi11 7 Chemiluminescence Determination of Proteases by Flow Injection Using Immobilized Isoluminol-RobertEdwards, Alan Townshend, Barry Stoddart121 Determination of Volatile Phenols by a Flow Injection Chemiluminescent Quench Method-Hui-shengZhuang, Fan Zhang, Qiong-e Wang125 Kinetic Determination of Propyl Gallate in Edible and Cosmetic Oils With Sensitized Terbium(iii)Luminescence Detection-Sagrario Panadero, Agustina Gomez-Hens, Dolores Perez-Bendito129 Kinetic Determination of Carbirnazole, Methimazole and Propylthiouracil in Pharmaceuticals, Animal Feedand Animal Livers-Ma Soledad Garcia, Ma Isabel Albero, Concepcidn SBnchez-PedreAo, Lorenzo Tobal135 Enzymic Method for the Amperometric Determination of Nicotinic Acid in Meat Products-Takashi Hamano,Yukimasa Mitsuhashi, Nobuaki Kojima, Nobumi Aoki, Masanori Semma, Yoshio Ito, Yoshikiyo Oji7Continued on inside back cover-Typeset and printed by Black Bear Press Limited,Cambridge, England0003-26541199511:l-NEW AND VIEWS1391 4314915516116717117517918318719319720120721 121 521 721 821 9223225228VStudy of the Electrocatalytic Effect of Casein on the Polarographic Reduction of Nickel(i1).Determination ofTotal Proteins in Milk by Polarographic Chronoamperometry-A. Sanchez Perez, M. M. DelgadoZamarreAo, M. B. Turrion Nieves, J. Hernandez MendezDetermination of Cobalt in Blood Using Cathodic Stripping Voltammetry-Beata Godlewska, JerzyGolimowski, Adam Hulanicki, Constant M. G. van den BergComputer Program for Examination of Acids by Conductimetric-Potentiometric Titration-EdwardChromiakDevelopment of an Integrated Thermal Biosensor for the Simultaneous Determination of MultipleAnalytes-Bin Xie, Michael Mecklenburg, Bengt Danielsson, Ove Ohman, Peter Norlin, Fredrik WinquistSelective Piezoelectric Sensors Using Polymer Reagents-Thomas C. Hunter, Gareth J.PriceDetermination of Fluoride in the Presence of Tetravalent Metal Ions With an Ion-selective Electrode:Application to Raw Materials of Fluoride Glasses-Akio Yuchi, Tomoko Niwa, Hiroko WadaDetermination of Pyridoxamine in Urine by Matrix lsopotential Synchronous FluorescenceSpectrometry-J. J. Berzas Nevado, J. A. Murillo Pulgarin, M. A. Gomez LagunaUse of Fluorescamine for the Spectrofluorimetric Investigation of Primary Amines on Silanized Glass andIndium Tin Oxide-coated Glass-Robert Wilson, David J.SchiffrinSimultaneous Spectrofluorimetric Determination of Glycerol and Ethanol in Wine by Flow Injection UsingImmobilized Enzymes-I. L. Mattos, J. M. Fernandez-Romero, M. D. Luque De Castro, M. ValcarcelDetermination of Chloride Ions by Reaction With Mercury Thiocyanate in the Absence of Iron(iti) Using anUltraviolet-photometric, Flow Injection Method-Joanne Cirello-Egamino, Ian D. BrindleDetermination of Micro-amounts of Phosphorus With Malachite Green Using a Filtration-DissolutionPreconcentration Method and Flow Injection-Spectrophotometric Detection-Joko P. Susanto, Mitsu koOshima, Shoji Motomizu, Hiroshi Mikasa, Yoshikazu HoriDerivative Ultraviolet Spectrophotometric Determination of Saccharin in Artificial Sweeteners-Cristina D.Vianna-Soares, Jorge L. S.MartinsSpectrophotometric Determination of Uranium(iv) With Thorin andN-Hydroxy-N,N’-diphenylbenzamidine-Neena Nashine, Rajendra Kumar MishraApplication of Flow Injection Spectrophotometry to the Determination of Dissolved Iron in Sea-water-lrinaYa. Kolotyrkina, Liliya K. Shpigun, Yury A. Zolotov, Alexander MalahoffComparison of Sample Preparation Methods for the Spectrophotometric Determination of Phosphorus inSoil and Coal Fly Ash-Johanna M. SmellerMineral Analysis Using X-ray Powder Data-Nicholas Caios, Colin H. L. Kennard, Lambert K. Bekessy,ERRATUMCUMULATIVE AUTHOR INDEXCOPYRIGHT LICENCEINSTRUCTIONS TO AUTHORSGUIDELINES FOR SUBMISSION ON DISKIUPAC PUBLICATIONS ON NOMENCLATURE AND SYMBOLISMREFEREEING PROCEDURE AND POLICY (1995)FACSS 1995: ANNOUNCEMENT AND CALL FOR PAPERS3N Book Reviews7N Conference Diary12N Courses13N Papers in Future Issues15N List of Abbreviations and AcronymsCover picture: Authenticy of orange juice (see p. 1). Photograph kindly supplied by courtesy of Leeton CitrusJuices