1. 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, Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China
2. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, P. R. China
3. University of Chinese Academy of Sciences, Beijing 100049, P. R. China
4. College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China
5. Department of Environmental Sciences, Rutgers University, New Brunswick, New Jersey 08901, United States