Göran Lithner,^* Hans Borg,^** Jörgen Ek,^*** Elisabeth Fröberg,^**** Karin Holm,^***** Ann-Marie Johansson,^****** Pia Kärrhage,^******* Göran Rosén,^******** Maria Söderström<sup>*********


*</sup>Göran Lithner has long experience in the field of ecotoxicology of chemical elements in the environment. Goran.Lithner@itm.su.se
^**Hans Borg has a PhD in limnology. His research is focused on the effects of acidification, and remedial actions against acidification, on the turnover of elements in aquatic systems. He is the head of the laboratory of aquatic environmental chemistry at ITM. Hans.Borg@itm.su.se
^***Jörgen Ek is an analytical chemist with long experience in analyses of nutrients and metals (ICP-MS) in water. His address: Institute of Applied Environmental Research (ITM), Stockholm University, SE-106 91 Stockholm, Sweden. Jorgen.Ek@itm.su.se
^****Elisabeth Fröberg is a trained analytical chemist with long experience in analyses. Elisabeth.Froberg@itm.su.se
^*****Karin Holm is a trained analytical chemist with long experience in analyses of chemical elements (AAS, ICP-MS) in environmental samples. Karin.Holm@itm.su.se
^******Ann-Marie Johansson is a trained analytical chemist with long experience in analyses of metals in sediments (AAS). Annmari.Johansson@itm.su.se
^*******Pia Kärrhage is a trained analytical chemist with long experience in analyses of mercury (AAS) in sediment biota. Pia.Karrhage@itm.su.se
^********Maria Söderström has a licentiate in environmental chemistry with long experience in analyses of POP's in the environment. She is especially interested in the fate of organic contaminants in the aquatic environment. Maria.Soderstrom@itm.su.seTheir address: Institute of Applied Environmental Research (ITM), Stockholm University, SE-106 91 Stockholm, Sweden.
^*********Göran Rosén is a trained phytoplankton taxonomist and ecologist with long experience from all types of lakes in Sweden. His address: Strandvägen 11, SE-750 07 Stenhamra, Sweden.