1. ASL Laboratories Ltd., 1988 Triumph Street, Vancouver, British Columbia, Canada V5L 1K5; Eastern Cereal and Oilseeds Research Centre, Research Branch, Agriculture and Agri-Food Canada, Ottawa, Ontario, Canada K1A 0C6; Centre for Analytical and Environmental Chemistry, Carleton University, Ottawa, Ontario, Canada K1S 5B6; and EcoSpec Consulting, 106 Queen's Road, Pointe-Claire, Quebec, Canada H9R 4G4