1. College of Earth Science, Chengdu University of Technology, Chengdu, China
2. Department of Geological Engineering, Montana Technological University, Butte, MT, USA
3. College of Geography and Planning, Chengdu University of Technology, Chengdu, China
4. State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil and Water Pollution (Chengdu University of Technology), Chengdu, China