http://reply.papertrans.cn/1/87/8687/8687-11.png
Submitted on: 16 June 1999.
Revised on: 05 October 1999.
Accepted on: 01 November 1999.
___________________ENVIRONMENTAL SCIENCE & TECHNOLOGY
http://reply.papertrans.cn/1/87/8687/8687-13.png
Submitted on: 08 October 2008.
Revised on: 07 November 2008.
Accepted on: 01 January 2009.
___________________ENVIRONMENTAL SCIENCE & TECHNOLOGY
http://reply.papertrans.cn/1/87/8687/8687-15.png
http://reply.papertrans.cn/1/87/8687/8687-16.png
Submitted on: 25 August 2008.
Revised on: 18 October 2008.
Accepted on: 08 November 2008.
___________________ENVIRONMENTAL SCIENCE & TECHNOLOGY
http://reply.papertrans.cn/1/87/8687/8687-18.png
http://reply.papertrans.cn/1/87/8687/8687-19.png
http://reply.papertrans.cn/1/87/8687/8687-20.png