1. Zentrum für Forschung und Weiterbildung; Weihenstephan-Triesdorf - University of Applied Science; Am Staudengarten 7 D-85354 Freising-Weihenstephan Germany
2. Faculty of Sciences, Division of Chemistry, Department of Analytical Chemistry and Applied Spectroscopy; Free University of Amsterdam; De Boelelaan 1083 NL-1081 HV Amsterdam The Netherlands
3. Analytical Research Group, Chair of Urban Water Systems Engineering; Technical University of Munich; Am Coulombwall 8 D-85748 Garching Germany