1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China, Graduate University of Chinese Academy of Sciences, Beijing, 100049, China, Norwegian Institute for Water Research (NIVA), Gaustadalléen 21, 0349 Oslo, Norway, and Department of Chemistry, University of Oslo, P.O. Box 1033, 0315 Oslo, Norway