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Title: Aquatic dissipation of triclopyr in a whole-pond treatment
Authors: NDR Research.
Dow AgroSciences LLC.
Geological Survey (U.S.). Biological Resources Division.
United States. Agricultural Research Service.
Aquatic Ecosystem Restoration Foundation, Inc.
Aquatic Plant Control Research Program (U.S.)
Petty, David G.
Skogerboe, John G.
Getsinger, Kurt D.
Foster, Dale R.
Fairchild, James W.
Anderson, Lars W.
Keywords: Aquatic herbicide fate
Garlon 3A
Aquatic plant control
Eurasian watermilfoil
Publisher: Environmental Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Description: Technical Report
Abstract: The aquatic fate of the triethylamine formulation of triclopyr (3,5,6-trichloro-2-pyridinyloxyacetic acid) was studied in closed-pond systems in California, Missouri, and Texas as whole-pond applications. This study determined dissipation rates of triclopyr and its major metabolites, TCP (3,5,6-trichloropyridinol) and TMP (3,5,6-trichloro-methoxypyridine) in water, sediment, and finfish. Two ponds at each site containing a healthy biological community were treated at 2.5 mg/L triclopyr. Water and sediment samples were collected through 12-week posttreatment, and nontarget animals were collected through 4-week posttreatment. Dissipation rates for triclopyr, TCP, and TMP were similar at each of the study sites, despite differences in weather, water quality, biotic community, light transmission, and geographic location. Half-lives of triclopyr in water ranged from 5.9 to 7.5 days, while TCP ranged from 4.0 to 10.0 days, and TMP ranged from 4.0 to 7.7 days. Levels of triclopyr and TCP declined in sediments at half-lives ranging from 2.8 to 4.6 days and 3.8 to 13.3 days, respectively. Levels of TMP in sediment were below limits of detection. Triclpyr and TCP cleared from fish in relation to concentrations found in the water column. TMP levels in fish were generally an order of magnitude higher than levels of triclopyr and TCP, particularly in the viscera portion of the animals. No adverse effects on water quality or on the nontarget biotic community were found following triclopyr applications. Results of this study were similar to those of triclopyr dissipation studies conducted in reservoirs, lakes, and riverine systems in Georgia, Florida, Minnesota, and Washington. Therefore, the degradation and dissipation of triclopyr and its metabolites are similar in representative systems throughout the continental United States.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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