1. Department
of Chemistry, Umeå University, SE-901 87 Umeå, Sweden
2. Department
of Applied Environmental Science (ITM), Stockholm University, SE-106
91 Stockholm, Sweden
3. ÅF AB,
Umestan
Företagspark, SE-903 47 Umeå, Sweden
4. Division
of Geophysics and Marine Geology, Geological Survey of Sweden (SGU), Box 670, SE-751 28 Uppsala, Sweden
5. Department
of Earth Sciences, University of Gothenburg, Box 460, SE-405 30 Gothenburg, Sweden
6. Department
of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences (SLU), SE-750 07, Uppsala, Sweden