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| Web URL(s): | http://archive.lib.msu.edu/tic/rpr/2000/72168,%20U%20Georgia, Armbrust.PDF
Last checked: 02/14/2013
Requires: PDF Reader |
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| Publication Type:
| Report |
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| Material Type: | Manuscript |
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| Monographic Author(s): | Armbrust, Kevin L. |
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| Author Affiliation: | Principal Investigator |
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| Monograph Title: | Calibration of Computer Model Scenarios (PRZM3/EXAMS2) for Pesticide Runoff and Leaching in Turfgrass Environments: 2000 Annual Report to the United States Golf Association, 2000. |
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| Publishing Information: | [Athens, Georgia: University of Georgia] |
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| # of Pages: | 17 |
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| Collation: | 7, [10] pp. |
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| Abstract/Contents: | "To address the overarching objectives of this investigation, this year's research focused on collecting current and historical data on specific pesticide degradation products in golf course leachate from lysimeters constructed into golf course greens as well as characterizing the fate of one of the degradation products in laboratory investigations. This data is needed to conduct further exposure modeling in years two and three. Chlorothalonil and chlorpyrifos are commonly used to control disease and insect pests on golf course greens in the southeastern U.S. While they are relatively immobile in the soil profile, their respective soil degradation products, 4-hydroxy-2,5,6-trichloroisophthalonitrile and 3,5,6-trichloropyridin-2-ol are more polar may be present in green leachate. To investigate this possibility, six stainless steel lysimeters were constructed into two practice greens at a country club in a northern Atlanta, Georgia suburb. Over a period of 1 year after rainfall events, lysimeter leachate samples were collected into glass bottles, filtered, and directly analyzed by HPLC. Chlorpyrifos was not detected in any sample and chlorothalonil was detected only in one sample at a concentration of 0.12 mg/L. Hydroxychlorothalonil and trichloropyridinol were respectively measured in 87% and 63% of the samples at maximum and median concentrations of 2.21 mg/L and 0.55 mg?l for hydroxychlorothalonil and 1.77 mg?l and 0.15 mg/L for trichloropyridinol. Data generated by the pesticide registrant for chlorpyrifos has shown that trichloropyridinol is rapidly degraded by water by sunlight. Irradiation with simulated sunlight degraded hydroxychlorothalonil in DI water, phosphate buffer, and pond water with half-lives of approximately 30 minutes. Simulated degradation of hydroxychlorothalonil in a pond setting using the US EPA's EXAMS MSPond scenario suggested that this laboratory generated 30 minute half-life would equate to approximately a 2.6 day half-life in a 2 m deep pond. Although hydroxychlorothalonil is moderately stable and mobile in soil, these data suggest that in surface water it should be rapidly degraded by sunlight to small aliphatic acids upon transport into aquatic systems." |
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| Language: | English |
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| References: | 0 |
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| See Also: | See also related summary article, "Calibration of Computer Model Scenarios (PRZM3/EXAMS2) For Pesticide Runoff and Leaching in Turfgrass Environments", 2000 Turfgrass and Environmental Research Summary [USGA], p. 66, 2000, R=72168. R=72168 |
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| Note: | Graphs
"2000 Annual Report to the United States Golf Association"
Also appears as pp. 286-302 in the USGA Turfgrass Research Committee Reporting Binders for 2000. |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
No defined citation format for TGIF #: 215331 |
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Last checked: 02/14/2013
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