Journal
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES
Volume 46, Issue 4, Pages 281-293Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/03601234.2011.559424
Keywords
Exposure assessment; forestry; triclopyr; 2; 4-D; biomonitoring; backpack
Funding
- USDA Forest Service
- Division of Agricultural and Natural Resources, University of California
Ask authors/readers for more resources
Two herbicides, 2,4-D and triclopyr esters (application ratio 1.6:1 acid equivalents) were applied as a tank mix by a crew of 8 backpack sprayer applicators, a mixer/loader, and a field supervisor. The crew was employed in a conifer release program in northern California during the summer of 2002. Biomonitoring (urine, 24 h) utilized 2,4-D and triclopyr (a.e.) as rapidly excreted exposure biomarkers. The absorbed dosages of 2,4-D and triclopyr were calculated based upon cotton whole body suits and biomonitoring. Dosages based upon accumulation of the herbicides on body suits averaged 42.6 g (a.e.) 2,4-D/kg-d and 8.0 g (a.e.) triclopyr/kg-d. Six consecutive days of concurrent urine collections showed that backpack applicators excreted an average of 11.0 g (a.e.) 2,4-D/kg-d and 18.9 g (a.e.) triclopyr/kg-d. Estimates based upon curve fitting were 17.1 and 29.3 g (a.e.)/kg-d, respectively. Results suggest that passive dosimetry for 2,4-D consistently overestimated the dosage measured using biomonitoring by a factor of 2-3 fold, while for triclopyr, passive dosimetry underestimated the absorbed dose based on biomonitoring by a factor of 2-4 fold.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available