1. Laboratory of Environmental Chemistry, School of Architecture, Civil and Environmental Engineering (ENAC), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
2. Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dübendorf8600, Switzerland
3. Swiss Tropical and Public Health Institute, Basel 4051, Switzerland
4. University of Basel, Basel 4051, Switzerland