1. Department of Water Quality Control, Technical University of Berlin, Sekr KF 4, Strasse des 17 Juni 135, 10623 Berlin, Germany, Europa University for Applied Sciences Fresenius, Limburger Strasse 2, 65510 Idstein, Germany, Department of Environmental Chemistry, IIQAB-CSIC, Jordi Girona 18-26, 08034 Barcelona, Spain, and Aigües de Barcelona, Avinguda Diagonal 211, E-08018 Barcelona, Spain