1. Technical University of Munich, Chair of Analytical Chemistry and Water Chemistry, Marchioninistrasse 17, 81377 Munich, Germany
2. Helmholtz Zentrum München, Institute of Groundwater Ecology, Ingolstädter Landstrasse 1, 85764 Neuherberg, Germany
3. University of Tubingen, Center for Applied Geoscience, Hölderlinstrasse 12, 72074 Tübingen, Germany