1. Department of Chemistry, P.O. Box 3065, University of Victoria, Victoria, British Columbia, Canada V8W 3V6
2. Contaminants Science Section, Institute of Ocean Sciences, Department of Fisheries and Oceans Canada, Sidney, British Columbia, Canada V8L 4B2
3. Department of Chemistry and Biochemistry, University of Guelph, Guelph, Ontario, Canada N1G 2W1