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RISS 인기검색어
- 검색키워드
- 저자 : Feagley, (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Adsorption and Leaching of cis and trans-Permethrin in the Soil
Feagley, Sam Edward,Kim, Jung Ho 한국환경과학회 1995 한국환경과학회지 Vol.4 No.4
Permethrin[3-phenoxybenzyl (1RS)-cis,trans-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropane carboxylatel insecticides were selected to study adsorption and leaching potentials related to pollution on Commerce silty clay loam soil near Baton Rouge, Louisiana, USA. GLC-ECD chromatogram of permethrin included 32.5 % of cis-permethrin and 67.4 % of trans-permethrin. Extraction efficiencies of cis and trans-permethrin were 92.5 % and 92.3 in fortified water, respectively and 85.9 % and 88.8 % in fortified soil, respectively. At a 1:10 soil/water ratio,the Koc values for cis and trans isomers of permethrin were 938 and 877, respectively. Leaching of permethrin was evaluated in soil columns(5.4 cm i.d. × 26 cm length). Total recoveries of the permethrin applied to the soil column were 84.5 ± 3.1 %. When the soil columns were leached with three pore volumes of water, the distributions of cis-permethrin leached were 6.10 % and 0.07 % of amount applied in the untreated zone soil and leachate water, respectively. Trans-permethrin distributions were 5.20 % in the untreated zone soil and 0.05 % in leachate water. Cis and trans-permethrin was strongly adsorbed to soil. The results of the study showed the strong relationship between adsorption and leaching. Cis and trans-permethrin to be leached into the groundwater in soils with shallow aquifers were suggested a low leaching potential.
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Runoff of Trifluralin from Fields in Louisiana
Kim, Jung Ho,Feagley, Sam Edward 한국환경과학회 1996 한국환경과학회지 Vol.5 No.5
Trifluralin (2,6-dinitro-N, N-dipropy1-4- (trifluormethyl) benzenamine) was applied preemergent to soybean in plots drained or nondrained, in Louisiana. Plots 14.6 ㏊ were arranged to give 1683 g/㏊ of trifluralin. The half life of trifluralin in the top 15㎝ of soil was 42.6 days and 46.0 days in nondrained plot and drained plot, respectively. The concentrations of trifluralin in surface runoff water and subsurface runoff water were 0.62 ng/mL-0.02 ng/mL and 0.06 ng/mL-0.02 ng/mL, respectively. The concentration of trifluralin in runoff water was smaller than 2 ng/mL for trifluralin of U.S. Environmental Protection Agency advisory. Total loss of trifluralin in runoff water was 0.021% of applied amount at drained plots during three month after application. Trifluralin was moved hardly in the water. Subsurface drainage reduced trifluralin losses because concentration of trifluralin in the subsurface runoff water in drained fields was low.
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Movement of trifluralin , metolachlor and metribuzin in the soil environment
Kim, Jung Ho,Feagley, S E,Southwick, L M,Wills, H W,Bengtson, R L 한국농화학회 1992 Applied Biological Chemistry (Appl Biol Chem) Vol.35 No.4
The objective of this study was to evaluate the runoff behavior and leaching properties in soil environment of trifluralin, metolachlor and metribuzin: herbicides used widely in Louisiana and other states with soybeans. Adsorption-desorption of the these herbicides trifluralin, metolachlor and metribuzin was studied in a selected soil (Clay loam). At a 1: 10 soil/water ratio, the Freundlich constant Kd, for trifluralin metolachlor and metribuzin were 9.97, 1.54 and 1.10 respectively. Leaching and distribution of these herbicides were evaluated in soil columns (id 5.4㎝×26㎝). When the soil columns were leached with three pore volume of water, the distribution of trifluralin in soil and Leachate water was 70.02% and 0.005% of the applied amount respectively. The distribution of metolachlor was 42.93% in soil and 21.33% in leachate water. The distribution of metribuzin was 8.88% in soil and 68.97% in leachate water. Metolachlor and metribuzin were readily leached while trifluralin was strongly adsorbed to the soil. The results of the study illustrate the strong correlation between adsorption-desorption properties and leaching properties. From Louisiana field plot applied 1683 g/㏊ trifluralin 2759 g/㏊ of metolachlor and 609 g/㏊ of metribuzin, half life the field was 0.083∼0.052 ng/㎖. The concentration of metolachlor and metribuzin were 19∼402 ng/㎖ and 1.5∼56.2 ng/㎖ respectively. The trifluralin loss in surface water from the field was 0.0016% (0.0269 g/㏊) of the amount applied on 3 times of run off events. The total in surface water was 12.34% (340.46 g/㏊) and 7.11% (43.29 g/㏊) respectively, for the metolachlor and metribuzin on 7 times of run off events. The concentration of trifluralin in 1 m and 2 m well were the range of 0.04 ng/㎖∼0.08 ng/㎖. This indicated that leaching of trifluralin was very low. The concentration of metolachlor in 1 m well was decreased froth 205.3 ㎎/㎖ during 17∼62 days after application. The concentration of metribuzin in 1 m well also was decreased from 64.2 ng/㎖ to 0.70 ng/㎖, but in 2 m well was increased from 1.9 ng/㎖ to 76.7 ng/㎖. A contamination of metolachlor and metribuzin in ground water were higher than trifluralin.
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