1. Prof., State Key Lab. of Envir. Aquatic Chem., Res. Ctr. for Eco-Envir. Sci., P.O. Box 2871, Beijing, 100085 China (corresponding author). E-mail: yangmin@mail.rcees.ac.cn
2. Res. Asst., State Key Lab. of Envir. Aquatic Chem., Res. Ctr. for Eco-Envir. Sci., P.O. Box 2871, Beijing, 100085 China. E-mail: zhangyu @mail.rcees.ac.cn
3. Doctoral Student, State Key Lab. of Envir. Aquatic Chem., Res. Ctr. for Eco-Envir. Sci., P.O. Box 2871, Beijing, 100085 China. E-mail: bingshao88@263.net
4. Res. Asst., State Key Lab. of Envir. Aquatic Chem., Res. Ctr. for Eco-Envir. Sci., P.O. Box 2871, Beijing, 100085 China. E-mail: qirong@ mail.rcees.ac.cn
5. Central Res. Lab., Organo Co., 4-9, kawagishi 1-chome, Toda City, Saitama Pref., 335-0015 Japan. E-mail: myoga-h@organo.co.jp