title: Occurrence of glyphosate in surface waters of Southern Ontario.
abstract: 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 microg a.e./L), and the maximum concentration of glyphosate measured was 40.8 microg/L. No samples of roughly 500 analyzed exceeded the Canadian Water Quality Guideline of 65 microg 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.
authors.affiliation: Environment Canada, Burlington, ON, Canada.
authors.forename: John
authors.initials: J
authors.lastname: Struger
authors.forename: Dean
authors.initials: D
authors.lastname: Thompson
authors.forename: Bozena
authors.initials: B
authors.lastname: Staznik
authors.forename: Pamela
authors.initials: P
authors.lastname: Martin
authors.forename: Tana
authors.initials: T
authors.lastname: McDaniel
authors.forename: Chris
authors.initials: C
authors.lastname: Marvin
mesh_terms: D000818:Animals; D001001:Anura / Q000378:metabolism; D002849:Chromatography, Gas; D004781:Environmental Exposure / Q000032:analysis; D005618:Fresh Water; D005998:Glycine / Q000031:analogs & derivatives* / Q000032:analysis / Q000633:toxicity; D006540:Herbicides / Q000032:analysis* / Q000633:toxicity; D007555:Isoxazoles; D007928:Lethal Dose 50; D009864:Ontario; D063065:Organophosphonates / Q000032:analysis; D010573:Pesticide Residues / Q000032:analysis*; D011786:Quality Control; D013777:Tetrazoles; D014874:Water Pollutants, Chemical / Q000032:analysis*; D000097797:Glyphosate
chemical_list: D005998:Glycine; D006540:Herbicides; D007555:Isoxazoles; D063065:Organophosphonates; D010573:Pesticide Residues; D013777:Tetrazoles; D014874:Water Pollutants, Chemical; D000097797:Glyphosate; C418233:2-amino-3-(3-hydrox-5(2-methyl-2H-tetrazol-5-yl)isoxazol-4-yl)propionic acid