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ANALYTICA CHIMICA ACTA An international journal devoted to all branches of analytical chemistry (Full texts are incorporated in CJELSEVIER, a file in the Chemical Journals Online database available on STN International: Abstracted, indexed in: Aluminum Abstracts; Anal. Abstr.; Biol. Abstr.; BIOSIS; Chem. Abstr.; Curr. Contents Phys. Chem. Earth Sci.; Engineered Materials Abstracts; Excerpta Medica; Index Med.; Life Sci.; Mass Spectrom. Bull.; Material Business Alerts; Metals Abstracts; Sci. Citation Index) VOL. 254 NO. 1-2 CONTENTS NOVEMBER 20, 1991 Chromatography and other Separation Techniques Supported liquid membrane for analytical separation of transition metal ions. Part |. Complexation properties of 1,10-didecyl-1, 10-diaza-18-crown-6 N. Parthasarathy and J. Buffle (Geneva, Switzerland) Supported liquid membrane for analytical separation of transition metal ions. Part Il. Appraisal of lipophilic 1,10-didecyl-1,10-diaza-18-crown-6 as metal ion carrier in the membrane N. Parthasarathy and J. Buffle (Geneva, Switzerland) Determination of trace lanthanides in their pure oxides by liquid chromatography -—emission spectrometry V. Kubahi, |. Janéafova, V. Otruba and V. Kanicky (Brno, Czechoslovakia) Determination of 3-nitrofluoranthene and 1-nitropyrene in suspended particulate matter by liquid chromatography with fluorescence detection T. Kamiura, T. Kawaraya, M. Tanaka and T. Nakadoi (Osaka, Japan) Separation et identification de l’acide formique et d’acides plurifonctionnels par chromatographie liquide couplée a la spectrométrie de masse avec détection d’ions négatifs L.M. Moreira De Campos (Belo Horizonte, Brésil), T. Becue, D. Pradeau and M. Hamon (Chatenay-Malabry, France) . Effect of metals on the liquid chromatographic determination of paralytic shellfish poisons R. Guevremont, M.N. Quigley, V. Pathak, M. Schweitzer and J.L.C. Wright (Halifax, Canada) Ultraspurenanalytik in hochreinem Molybdan und Wolfram mit ionenchromatographischer Spuren-Matrix-Trennung. Teil 1. Auswahl und Optimierung des Trennschritts G. Wiinsch and A. Seubert (Hannover, Deutschland) lon chromatographic behaviour of anionic EDTA complexes of vanadium(IV) and vanadium(V) T.V. Komarova, O.N. Obrezkov and O.A. Shpigun (Moscow, USSR) Preconcentration and determination of organophosphonic acids: application to natural waters E. Frigge and E. Jackwerth (Bochum, Germany) Sensors Chemically modified field-effect transistors; a sodium ion selective sensor based on calix[4Jarene receptor molecules J.A.J. Brunink, J.R. Haak, J.G. Bomer, D.N. Reinhoudt (Enschede, Netherlands), M.A. McKervey (Belfast, UK) and S.J. Harris (Dublin, Ireland) Amperometric biosensing of organic peroxides with peroxidase-modified electrodes J. Wang, B. Freiha, N. Naser, E. Gonzalez Romero, U. Wollenberger, M. Ozsoz (Las Cruces, NM, USA) and O. Evans (Cincinnati, OH, USA) Electroanalytical Chemistry ‘ Comportement de quelques di-, tri- et tétrapeptides vis-a-vis du cuivre(Il). Etude en potentiométrie (électrode de cuivre) et en spectrométrie infrarouge E. Lati, C. Dauphin and M. Hamon (Chatenay-Malabry, France) (Continued overleaf) Contents (continued) Determination of cholinesterase in blood serum with a benzoate-sensitive membrane electrode T. Katsu and T. Kayamoto (Okayama, Japan) Atomic Spectrometry Determination of lead in water by electrothermal atomic absorption spectrometry with a nickel(Il)—ammonium tartrate modifier |. Sekerka and J.F. Lechner (Burlington, Canada) Analysis of steel samples employing ion chromatography-—sequential inductively coupled plasma atomic emission spectroscopy J.J. Giglio, J.H. Mike and D.W. Mincey (Youngstown, OH, USA) Determination of cobalt in human liver by atomic absorption spectrometry with electrothermal atomization E.D. Caldas (Brasilia, Brazil), M.F. Gine-Rosias (Sao Paulo, Brazil) and J.G. Dorea (Brasilia, Brazil) Neutron Activation Analysis Critical evaluation of the determination of zirconium and hafnium in meteorites by instrumental and radiochemical neutron activation analysis M. Burger and U. Krahenbihl (Bern, Switzerland) 119 Panoramic instrumental neutron activation analysis of synthetic and natural silica: a performance review of the ky standardization method F.D.C.A. De Wispelaere (Ghent, Belgium), M. Van den Boer, D. Bossus and R. Van Sluijs (Geleen, Netherlands) ... . Molecular Spectrometry Determination of curium at 0.1 ng |~' levels in a micellar medium by time-resolved laser-induced spectrofluorimetry C. Moulin, P. Decambox and P. Mauchien (Fontenay-aux-Roses, France) Determination of neodymium in rare earth mixtures by fourth-derivative spectrophotometry N. Wang, W. Liang and P. Qi (Jinan, China) Spectrophotometric determination of uranium and nitric acid by applying partial least-squares regression to uranium(VI) absorption spectra J. Burck (Karlsruhe, Germany) Flow Injection Analysis Mathematical modelling of single-line flow-injection analysis systems with single-layer enzyme electrode detection Part 3. Experimental verification of the model S.D. Kolev (Sofia, Bulgaria), G. Nagy and E. Pungor (Budapest, Hungary) Mathematical modelling of two-analyte sequential determinations by flow-injection sandwich techniques J.L. Montesinos, J. Alonso, M. Del Valle (Barcelona, Spain), J.L.F.C. Lima (Porto, Portugal) and M. Poch (Barcelona, Spain) Rapid screening of porphyrins using flow-injection analysis and visible laser fluorimetry C.W. Huie, J.H. Aiken and W.R. Williams (Binghamton, NY, USA) Flow-injection spectrophotometric determination of phosphate using Crystal Violet D.T. Burns (Belfast, UK), D. Chimpalee, N. Chimpalee and S. Ittipornkul (Nakorn Pathom, Thailand) Design and optimization of a flow-injection system for enzymatic determination of galactose K.S. Kurtz and S.R. Crouch (East Lansing, MI, USA) Confluent mixing efficiency in flow-injection systems T.L. Spinks, G.E. Pacey and |. Fabian (Oxford, OH, USA) Other Topics Development of a robotic standard addition method S.E. Eckert-Tilotta, T.L. Isenhour (Manhattan, KS, USA) and J.C. Marshall (Northfield, MN, USA) Characterization of acoustic emission from an electrolysis cell T.G. Crowther, A.P. Wade, P.D. Wentzell (Vancouver, Canada) and R. Gopal (Sarnia, Canada) Photodegradation of the carbamate pesticides aldicarb, carbaryl and carbofuran in water N. De Bertrand ard D. Barcelé (Barcelona, Spain) Catalytic behaviour of 1,2,3,4-thiatriazol-5-thiolate ions in the oxidation of hydrogen sulphite by oxygen E.P. Marques and D.W. Franco (Sao Carlos, Brazil) Book Reviews Author Index