Occurrence of Glyphosate in Surface Waters of Southern Ontario

  • John Struger
  • Dean Thompson
  • Bozena Staznik
  • Pamela Martin
  • Tana McDaniel
  • Chris Marvin
Article

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 μg a.e./L), and the maximum concentration of glyphosate measured was 40.8 μg/L. No samples of roughly 500 analyzed exceeded the Canadian Water Quality Guideline of 65 μg 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.

Keywords

Glyphosate Surface water Amphibians Guidelines 

Notes

Acknowledgements

The authors acknowledge the assistance of John Kraft and other Environment Canada staff for sample collection, and Environment Canada’s Pesticide Science Fund for financial support.

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • John Struger
    • 1
  • Dean Thompson
    • 2
  • Bozena Staznik
    • 2
  • Pamela Martin
    • 1
  • Tana McDaniel
    • 1
  • Chris Marvin
    • 1
  1. 1.Environment CanadaBurlingtonCanada
  2. 2.Great Lakes Forestry CentreCanadian Forest Service, Natural Resources CanadaSault Sainte MarieCanada

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