1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2. Key Laboratory of Karst Georesources and Environment (Guizhou University), Ministry of Education, Guiyang 550025, China
3. Environmental Geosciences, University of Basel, Basel 4056, Switzerland
4. University of Chinese Academy of Sciences, Beijing 100049, China