Northern Rivers Ecosystem Initiative: distribution and effects of contaminants

Environmental Monitoring and Assessment
Mark E McMasterL Mark Hewitt

Abstract

In response to a number of recommendations following the Northern Rivers Basin Studies (NRBS) contaminant program, the Northern Rivers Ecosystem Initiative (NREI) focused considerable attention on assessing contaminants from specific sources including pulp mill effluents, atmospheric transport of mercury and the Alberta oil sands operations. NRBS identified a number of major contaminants of concern including polychlorinated biphenyls, dioxins and furans, mercury and various hydrocarbons. Together, the NRBS and the NREI studies have demonstrated major declines in the levels of dioxins and furans over the last decade as pulp and paper mills have changed their process and treatment strategies in response to new Federal regulations. Polychlorinated biphenyls however, continue to be a concern for the region as their levels have not declined in fish and sediments over the course of these studies. Higher levels in sediments downstream of Grande Prairie and Hinton were identified, but the source of these contaminants remains unknown. Chlorinated pesticides were also investigated, and although toxaphene, DDT and other chlorinated organic pesticides were detected in fish tissue, they were present at very low levels. Studies on the oil sa...Continue Reading

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Citations

Feb 3, 2009·The Science of the Total Environment·Angela C ScottPhillip M Fedorak
Oct 20, 2020·Environmental Toxicology and Chemistry·T J ArciszewskiK R Munkittrick
Jun 15, 2019·The Science of the Total Environment·Jon Fennell, Tim J Arciszewski
Jul 31, 2021·The Science of the Total Environment·Ching-Chang LeeChien-Jung Tien
Sep 22, 2021·Integrated Environmental Assessment and Management·Tim J ArciszewskiMonique G Dubé

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