*Rolf Kipfer^1,2,3, Sebastien Giroud^1,3, Alexandra Kathryn Lightfooot^1,3, Capucine Marion^1,3, Ruedi Ruessel¹, UI Environmental Isotope Group¹ (1.Dept. Water Resources and Drinking Water, Swiss Federal Institute of Aquatic Science and Technology (Eawag), 2.Inst. of Geochemistry and Petrology, Dep. of Earth Sciences, Swiss Federal Institute of Technology (ETH), 3.Inst. of Biogeochemistry and Pollutant Dynamics, Dep. of Environmental Systems Science, Swiss Federal Institute of Technology (ETH))

*Friederike Currle¹, Theo Blanc², Yama Tomonaga¹, Rolf Kipfer^3,4,5, Daniel Hunkeler², Philip Brunner², Oliver S. Schilling^1,3 (1.Hydrogeology, Department of Environmental Sciences, University of Basel, Switzerland, 2.Centre for Hydrogeology and Geothermics, University of Neuchâtel, Neuchâtel, Switzerland, 3.Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dubendorf, Switzerland, 4.Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, Zurich, Switzerland, 5.Institute of Geochemistry and Petrology, ETH Zurich, Zurich, Switzerland)