Detection trends of 2,4‐d and 2,4,5‐t in prairie province rivers, 1976–1991

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Abstract
Records for the detection of the acid herbicides 2,4‐D (2,4‐dichlorophenoxyacetic acid) and 2,4,5‐T (2,4,5 trichlorophenoxyacetic acid) from long‐term monitoring sites in large rivers of the Canadian prairie provinces were compiled from 1976 to 1991 from the Environment Canada National Aquatic Database (NAQUADAT), and examined for temporal and spatial detection patterns. In Saskatchewan, but not Manitoba or Alberta, a significant correlation exists between sales of the herbicide 2,4‐D and detection frequencies. Monthly detection patterns of 2,4‐D conform approximately to use patterns. The related herbicide 2,4,5‐T was detected throughout the year, with no specific seasonal peaks, from 1976 until the early 1980's, when it was banned. The consistent detection of these herbicides in mainstem rivers, under significant dilution, indicate their heavy use.

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