Journal
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
Volume 80, Issue 4, Pages 378-384Publisher
SPRINGER
DOI: 10.1007/s00128-008-9373-1
Keywords
glyphosate; surface water; amphibians; guidelines
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Glyphosate in surface waters of southern Ontario (Canada) was studied over a 2-year period. A small percentage of samples exhibited glyphosate concentrations greater than the analytical limit of quantitation (17 mu g a.e./L), and the maximum concentration of glyphosate measured was 40.8 mu g/L. No samples of roughly 500 analyzed exceeded the Canadian Water Quality Guideline of 65 mu g a.e./L considered protective of aquatic life. Typical concentrations of glyphosate in amphibian habitats were well below a range of toxicity thresholds for aquatic organisms, and were thus judged to be unlikely to pose a substantial risk to either sensitive amphibian larvae or other aquatic biota.
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