1. ETH Zurich; Institute of Biogeochemistry and Pollutant Dynamics; Universitätsstrasse 16 CH-8092 Zürich Switzerland
2. Eawag: Swiss Federal Institute of Aquatic Science and Technology; Ueberlandstrasse 133 CH-8600 Dübendorf Switzerland
3. ETH Zurich; Institute of Geochemistry and Petrology; Clausiusstrasse 25 CH-8092 Zürich Switzerland