Title: Magnitude and persistence of herbicide residues in farm dugouts and ponds in the Canadian prairies
Abstract: Abstract Farm ponds or dugout waters were monitored for residues of seven major herbicides used in the Canadian prairies from fall of 1987 to spring of 1989. The frequencies of confirmed detection of herbicides in water samples, depending on the time of sampling, in decreasing order were: 2,4‐dichlorophenoxyacetic acid (2,4‐D; 93–100%), diclofop (46–95%), bromoxynil (50–85%), 4‐chloro‐2‐methyl‐phenoxyacetic acid (MCPA; 33–70%), triallate (28–63%), dicamba (17–55%), and trifluralin (0–18%). The corresponding frequencies of quantifiable residues (≥0.05 μg/L) were lower, ranging from 75 to 86% for 2,4‐D to 0 to 7% for dicamba. Median residues in all water samples were near or below the quantification limits of 0.05 μg/L. Maximum residues varied widely and were (μg/L): trifluralin (not detectable [ND]–0.11), bromoxynil (0.27–0.33), dicamba (ND–11.2), triallate (0.05–0.87), MCPA (0.12–1.97), 2,4‐D (0.64–2.67), and diclofop (0.27–3.47). Maximum residues were seasonal and declined to near or below detection limits by the following sampling time. Median values were two to three orders of magnitude less than the corresponding maximum allowable concentration and interim maximum allowable concentration guidelines for drinking water in Canada and the United States. Maximum values were also less than these guidelines. Only the maximum values for residues of MCPA and 2,4‐D approached the guidelines for these herbicides in water used for irrigation.
Publication Year: 1997
Publication Date: 1997-04-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 41
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