[1] State Univ Ghent, Analyt Chem Lab, B-9000 Ghent, Belgium
[2] Univ Complutense Madrid, Lab Quim Analit, E-28040 Madrid, Spain
[3] Free Univ Amsterdam, IVM, NL-1081 HV Amsterdam, Netherlands
[4] Inst Analyt Chem, A-1060 Vienna, Austria
[5] Univ Plymouth, Plymouth PL4 8AA, Devon, England
[6] Bodenseewerk Perkin Elmer & Co GmbH, D-88662 Uberlingen, Germany
[7] Prolabo, F-94126 Fontenay Sous Bois, France
[8] Chalmers Univ Technol, Dept Sanit Engn, S-41296 Gothenburg, Sweden
[9] ENEA CRE Casaccia, Div Chim Ambientale, I-00100 Rome, Italy
[10] Rhone Poulenc Rech, CRIT C, F-69192 St Fons, France
[11] Univ Pau & Pays Adour, Lab Chim Bioorgan & Environnement, F-64000 Pau, France
[12] Univ Instelling Antwerp, Dept Chem, B-2610 Wilrijk, Belgium
[13] Eurometaux, B-1150 Brussels, Belgium
[14] MAFF, Food Sci Lab, CSL, Norwich NR4 7UQ, Norfolk, England
[15] ICI, Middlesbrough TS90 8JE, Cleveland, England
[16] Danish Vet & Food Adm, Inst Food Res & Nutr, DK-2860 Soeborg, Denmark
[17] Degussa AG, D-63403 Hanau, Germany
[18] GKSS Forschungszentrum Geesthacht GmbH, Res Ctr, Inst Phys & Chem Anal, D-21502 Geesthacht, Germany
[19] Sveriges Provnings Och Forskinsinsitut, S-51015 Alvsborgslan, Sweden
[20] SM&T, DG XII, B-1049 Brussels, Belgium