1. Applied Environmental Research Laboratories (AERL), Chemistry Department, Vancouver Island University, Nanaimo, BC, V9R 5S5, Canada
2. Health PEI, Charlottetown, PEI, C1A 7N8, Canada
3. Chemistry Department, University of Victoria, Victoria, BC, V8P 5C2, Canada
4. Chemistry Department, Simon Fraser University, Burnaby, BC, V5A 1S6, Canada
5. Department of Occupational and Environmental Health Sciences, University of Washington, Seattle, WA, 98195-1618, USA