1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, No. 99, West Lincheng Road, Guiyang 550081, P. R. China
2. University of Chinese Academy of Sciences, Beijing 100049, P. R. China
3. CAS Center for Excellence in Quaternary Science and Global Change, Xi’an 710061, P. R. China
4. National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental and Soil Science, Guangdong Academy of Sciences, Guangzhou 510650, P. R. China
5. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, P. R. China