Karlsruhe Institute of Technology (KIT), Engler-Bunte-Institut, Water Chemistry and Water Technology, Engler-Bunte-Ring 9a, Karlsruhe 76131, Germany; DVGW Research Centre at Engler-Bunte-Institut of Karlsruhe Institute of Technology (KIT), Water Chemistry, Engler-Bunte-Ring 9a, Karlsruhe 76131, Germany.