1. School of Environment, Beijing Normal Univ.; State Key Laboratory of Water Environment Simulation; Beijing 100875 China
2. Agricultural and Environmental Chemistry Graduate Group; Univ. of California; Davis CA 95616
3. School of Chemical and Environmental Engineering, Chongqing Three Gorges Univ.; Wanzhou Chongqing 404100 China
4. College of Chemistry, Beijing Normal Univ.; Beijing 100875 China