1. Aquatic Contaminants Research Division, Environment Canada, 867 Lakeshore Road, Burlington, ON L7S 1A1, Canada
2. Department of Chemistry, York University, Toronto, ON, M3J 1P3, Canada
3. Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB, T6G 2R3, Canada
4. Department of Geography, Geomatics and Environment, University of Toronto Mississauga, Mississauga, Ontario L5L 1C6, Canada