1 / 8

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.

jeri
Download Presentation

Herbicide Residues in Fish Tissues

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related