http://cfs.nrcan.gc.ca/authors/read/16958 Publications by P. Martin en-ca 2008-06-13 00:00:00 MST 2008-06-13 00:00:00 MST webmaster@nofc.cfs.nrcan.gc.ca http://cfs.nrcan.gc.ca/publications?id=28657 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 mug a.e./L), and the maximum concentration of glyphosate measured was 40.8 mug/L. No samples of roughly 500 analyzed exceeded the Canadian Water Quality Guideline of 65 mug 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. Fri, 13 Jun 2008 http://cfs.nrcan.gc.ca/publications?id=28657