1. International Joint Research Center for Persistent Toxic Substances (IJRC-PTS), Dalian Maritime University, Dalian, P. R. China, IJRC-PTS, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, P. R. China, Science and Technology Branch, Environment Canada, Toronto/Burlington, Ontario, Canada, and Ontario Ministry of the Environment, Toronto, Ontario, Canada