1. Ministry of Education Key Laboratory of Groundwater Circulation and Environmental Evolution & School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China
2. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Beijing), Beijing 100083, China
3. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
4. Department of Water Resources, Beijing Water Science and Technology Institute, Beijing 100048, China