Adsorption and leachesg of trifluralin, metolachlor, and metribuzin in a commerce soil
作者:
Jung‐Ho Kim,
S. E. Feagley,
期刊:
Journal of Environmental Science and Health, Part B
(Taylor Available online 1998)
卷期:
Volume 33,
issue 5
页码: 529-546
ISSN:0360-1234
年代: 1998
DOI:10.1080/03601239809373161
出版商: Taylor & Francis Group
关键词: Adsorption;leaching;trifluralin;metolachlor;metribuzin;herbicides
数据来源: Taylor
摘要:
Trifluralin [2,6‐dinitro‐N,N‐dipropyl‐4‐(trifluoromethyl)benzenamine], metolachlor [2‐chloro‐N‐ethyl‐6‐methylphenyl)‐N‐(2‐methoxy‐1‐methylethyl) aceta mide], and metribuzin [4‐amino‐6‐(1,1‐dimethylethyl)‐3‐(methylthio)‐1,2,4, ‐triazin ‐5(4H)‐one] were selected to study adsorption and leaching potentials related to pollution on Commerce silty clay loam soil near Baton Rouge, Louisiana. At a 1:10 soil/water ratio, the Koc values for trifluralin, metolachlor and metribuzin were 875, 135, and 96, respectively. Leaching of these herbicides was evaluated in soil columns (5.4 cm i.d. × 26 cm long). Total recoveries of the herbicides applied to the soil column were 73.1% ±4.1%. When the soil columns were leached with three pore volumes of water, the distributions of trifluralin in soil and leachate were 99.993% and 0.007% of the total recoveries, respectively. The distributions of metolachlor was 65.27% in soil and 34.7 % in leachate. The distributions of metribuzin was 11.42% in soil and 88.58% in leachate. The results showed that metolachlor and metribuzin were readily leached, while trifluralin was strongly adsorbed to soil. Leaching of three herbicides in the soil column followed the leaching trends of their calculated leaching indices 1.41 × 104, 4.18 × 106, and 3.38 × 108for trifluralin, metolachlor, and metribuzin, respectively. The results of the study demonstrated the potential of pollution for metolachlor and metribuzin to be leached into the ground water in soils with shallow aquifer.
点击下载:
PDF (539KB)
返 回