Abstract
Dicamba is a chlorobenzoic acid herbicide used to control a broad spectrum of woody plants and broadleaf weeds in grain crops, turf, and a variety of noncrop lands. Wide use in the prairie provinces (Alberta, Saskatchewan, and Manitoba) and Ontario has established dicamba as one of the ten most used herbicides in Canada. A review of the environmental toxicology, chemistry, and fate of dicamba in the Canadian environment is necessary to assess the potential risk of contamination of aquatic resources. In Canada, the risks to major water uses posed by numerous organic and inorganic chemicals, pesticides, heavy metals, and other water quality parameters has been assessed through the establishment of water quality guidelines. These are concentration limits intended to protect the main water uses, which include raw water for the drinking water supply, freshwater and marine life, agricultural crop irrigation and livestock watering, recreational aesthetics, and industrial waters. In addition to the toxicological review, the development of water quality guidelines requires an assessment of contamination through environmental monitoring surveys and guidelines developed in other jurisdictions. The review of the environmental fate and effects for dicamba is summarized here with the recommended Canadian Water Quality Guidelines (CWQG) for the major water uses.
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Caux, PY., Kent, R.A., Taché, M., Grande, C., Fan, G.T., MacDonald, D.D. (1993). Environmental Fate and Effects of Dicamba: A Canadian Perspective. In: Ware, G.W. (eds) Reviews of Environmental Contamination and Toxicology. Reviews of Environmental Contamination and Toxicology, vol 133. Springer, New York, NY. https://doi.org/10.1007/978-1-4613-9529-4_1
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