1. College of Environment and Resources, Jilin University, Changchun, P. R. China;
2. Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, P. R. China;
3. Key Laboratory of Groundwater contamination and Remediation of Hebei Province and China Geological Survey, Shijiazhuang, P. R. China;
4. China University of Geosciences (Beijing), Beijing, P. R. China