1. Environmental Chemistry and Ecotoxicology (CECOTOX) - ISTE - ENAC, Ecole Polytechnique Fédérale de Lausanne, Station 2, Lausanne, CH-1015, Switzerland, Analytical and Biophysical Environmental Chemistry (CABE), University of Geneva, 30 Quai E. Ansermet, Geneva, CH-1211, Switzerland, and Laboratoire de Géochimie des eaux, Université Denis Diderot, UMR CNRS 7047, 2 place Jussieu 75251 Paris Cedex 05, France