1. UFZ-Center for Environmental Research Leipzig-Halle, Department of Isotope Biogeochemistry, Permoserstrasse 15, D-04318 Leipzig, Germany, Research Centre Jülich, Institute of Chemistry and Dynamics of the Geosphere: Agrosphere, D-52425 Jülich, Germany, GSF-National Research Center for Environment and Health, Institute of Groundwater Ecology, Ingolstädter Landstrasse 1, D-85764 Neuherberg, Germany, and UFZ-Center for Environmental Research Leipzig-Halle, Department of Bioremediation, Permoserstrasse 15,...