Fengchao Sun¹, Aileen Melsbach¹, Zhe Wang², Rani Bakkour¹, Mehdi G. Gharasoo³, Adrian Mellage⁴, Christian Griebler⁵, Martin Thullner⁶, Olaf A Cirpka⁴ and Martin Elsner¹, (1)Technical University of Munich, Chair of Analytical Chemistry and Water Chemistry, Munich, Germany, (2)Helmholtz Zentrum München, Institute of Groundwater Ecology, Munich, Germany, (3)University of Waterloo, Department of Earth and Environmental Sciences, Waterloo, ON, Canada, (4)University of Tübingen, Center for Applied Geoscience, Tübingen, Germany, (5)University of Vienna, Department of Limnology and Bio-Oceanography, Vienna, Austria, (6)Helmholtz Centre for Environmental Research - UFZ, Leipzig, Germany