1. State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, China
2. Center for Hydrogeology and Environment Geology, China Geological Survey, Baoding, China
3. State Key Lab. of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China
4. Inner Mongolia Environmental Monitoring Center, Neimenggu, China