1. Department of Water Resources and Drinking Water, Eawag, Swiss Federal Institute of Aquatic Science and Technology; Überlandstrasse Dübendorf Switzerland
2. Department of Earth Sciences, ETH Zurich, Institute of Geochemistry and Petrology; Clausiusstrasse Zurich Switzerland
3. Department of Earth Sciences, Institute of Geological Sciences; University of Bern; Baltzerstrasse Bern Switzerland
4. Oeschger Center for Climate Research; University of Bern; Baltzerstrasse Bern Switzerland
5. Now at Department of Archaeology; School of Human and Environmental Sciences, University of Reading; Whiteknights Reading UK
6. Department of Environmental Systems Science; ETH Zurich, Institute of Biogeochemistry and Pollutant Dynamics, Universitätsstrasse; Zurich Switzerland
7. Department of Water Resources and Drinking Water, Eawag; Swiss Federal Institute of Aquatic Science and Technology Dübendorf Switzerland