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Herbicide Residues in Fish Tissues

Herbicide Residues in Fish Tissues. Brian Finlayson Pesticide Investigations Unit California Department of Fish and Game. Evaluation of Herbicides. 1999 hexazinone sulfometuron-methyl glyphosate triclopyr 2,4-D atrazine 2000 atrazine hexazinone triclopyr hexazinone.

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Herbicide Residues in Fish Tissues

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  1. Herbicide Residues in Fish Tissues Brian Finlayson Pesticide Investigations Unit California Department of Fish and Game

  2. Evaluation of Herbicides • 1999 • hexazinone • sulfometuron-methyl • glyphosate • triclopyr • 2,4-D • atrazine • 2000 • atrazine • hexazinone • triclopyr • hexazinone

  3. Assessment Factors • Water solubility • Persistence • BCF (biological concentration factor) • Application technique

  4. Atrazine • Low BCF (<100) • Slightly water soluble (28 ppm) • Retention of herbicide residues (easily absorbed) • Highly persistent in water and soil (> 1 yr) • Ground application

  5. 2,4-D • Ester forms have relatively high BCF • Easily absorbed by organisms • Chronic toxicity in mammals (cancer/birth defects) • Low conc found in surface water • Not persistent • Aerial application

  6. Triclopyr • Highly soluble in water • BCF for ester formulations may be high • Low persistence in organisms • Detected in 2,4-D analysis (free)

  7. Sample Parameters • whole body analyses • resident riffle sculpin (composite) • young-of-year salmonids (composite) • 10 samples per site per species • double wrapped in aluminum foil • dry ice shipment • late spring (following applicat1on)

  8. Analyses • $750/sample for 2,4-D and triclopyr • $750/sample for atrazine • 100 grams per sample • QA/QC procedures • duplicate analyses • matrix spikes

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