1. Sheridan College School of Chemical and Environmental Sciences 7899 McLaughlin Road Brampton ON L6Y 5H9 Canada
2. Department of Laboratory Medicine and Pathology University of Alberta Edmonton AB T6G 2G3 Canada
3. Department of Environmental Sciences and Analytical Chemistry Stockholm University Stockholm 10691 Sweden
4. Environment and Climate Canada Water Science and Technology Directorate 867 Lakeshore Road Burlington ON L7S 1A1 Canada