Maria Söderström,^* Kerstin Nylund,^** Ulf Järnberg,^*** Göran Lithner,^**** Göran Rosén,^***** Henrik Kylin<sup>******


*</sup>Maria Söderström has a licentiate in environmental chemistry from Stockholm University. She has long experience in analysis of environmental sampling and methodological development. She is especially interested in the fate of organic contaminants in aquatic environments. maria.soderstrom@itm.su.se
^**Kerstin Nylund is a research engineer with long experience in analysis of chlorinated biphenyls and pesticides in sediment and biological matrices. She is responsible for laboratory quality assurance. kerstin.nylund@itm.su.se
^***Ulf Järnberg has a PhD in analytical chemistry from Stockholm University. He has long experience in the field of analytical environmental chemistry and in particular halogenated pollutants. He has a wide interest in the distribution, occurrence and behavior of organic pollutants from the source to the aquatic environment. ulf.jaernberg@itm.su.se
^****Göran Lithner is an ecotoxicologist with long experience of the fate and effects of metals in aquatic as well as in terrestial ecosystems. He is specially engaged in the circulation of metals in the limnic environment. goran.lithner@itm.su.seTheir address: Institute of Applied Environmental Research (ITM), Laboratory of Analytical Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden.
^*****Göran Rosén is a phytoplankton specialist with long experience. His address is Strandvägen 11, SE-171 69 Stenhamra, Sweden.
^******Henrik Kylin has a PhD in environmental chemistry from Stockholm University and is associate professor and senior researcher in environmental assessment. His research interests include studies on environmental fate and global transport processes of organic contaminants, circulation of environmental contaminants in aquatic and terrestrial ecosystems and in the technosphere and development of analytical techniques, including ‘low-tech’ techniques suitable for developing countries. His address: Department of Environmental Assessment, Swedish University of Agricultural Sciences, P.O. Box 7050, SE-750 07 Uppsala, Sweden. Henrik.Kylin@ma.slu.se