1. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources; Qinghai Institute of Salt Lakes, Chinese Academy of Sciences; Xining 810008 PR China), Fax: (+86)-0971-6303126
2. Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources; Xining 810008 PR China
3. University of Chinese Academy of Sciences; Beijing 100049 PR China
4. Department of Chemistry; Chongqing Normal University; Chongqing 401331 PR China