1. Department of Chemistry, University of Toronto Scarborough, Toronto, Ontario, Canada, M1C 1A4, National Water Research Institute, Environment Canada, 867 Lakeshore Road, P.O. Box 5050, Burlington, Ontario, Canada, L7R 4A6, and Advanced Chemistry Development Inc., 110 Yonge Street, 14th floor, Toronto, Ontario, Canada, M5C 1T4