1. Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dübendorf, Switzerland
2. Institute of Biogeochemistry and Pollutant Dynamics, ETH Zürich, 8092 Zürich, Switzerland
3. Department of Chemistry, University of Zürich, 8057 Zürich, Switzerland
4. Chemical Research, Syngenta Crop Protection AG, Schaffhauserstrasse 101, CH-4332 Stein, Switzerland
5. Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany