1. Department of Chemistry, Université de Montréal, CP 6128 Centre-ville, Montréal, QC, Canada, H3C 3J7, Phytronix Technologies Inc., 337 Rue Saint-Joseph Est, Québec, QC, Canada, G1K 3B3, Department of Environment and Sustainable Development, City of Montreal,801 Brennan St., Montreal, QC, Canada, H3C 0G4, Environment Canada, 867 Lakeshore Road, Burlington, ON, Canada, L7R 4A6, and Centre d’Expertise en Analyse Environnementale du Québec, 850 boul. Vanier, Laval, QC, Canada, H7C 2M7