1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, P. R. China;
2. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, P. R. China;
3. School of Chemical Engineering, Chonnam National University, Gwangju, Korea;
4. Department of Plant and Environmental Sciences, University of Copenhagen, Frederiksberg, Denmark;
5. School of Environment, Tsinghua University, Beijing, P. R. China