期刊
ENVIRONMENTAL POLLUTION
卷 156, 期 3, 页码 794-802出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2008.06.002
关键词
Vadose zone; Groundwater contamination; Herbicides; MACRO modeling; Spatial variation
资金
- Danish Government to The Geological Survey of Denmark and Greenland
- Danish Institute for Agricultural Sciences
Pesticide mineralization and sorption were determined in 75 soil samples from 15 individually drilled holes through the vadose zone along a 28 km long transect of the Danish outwash plain. Mineralization of the phenoxyacetic acid herbicide MCPA was high both in topsoils and in most subsoils, while metribuzine and methyltriazine-amine was always low. Organic matter and soil pH was shown to be responsible for sorption of MCPA and metribuzine in the topsoils. The sorption of methyltriazine-amine in topsoil was positively correlated with clay and negatively correlated with the pH of the soil. Sorption of glyphosate was tested also high in the subsoils. One-dimensional MACRO modeling of the concentration of MCPA. metribuzine and methyltriazine-amine at 2 m depth calculated that the average concentration of MCPA and methyltriazine-amine in the groundwater was below the administrative limit of 0.1 mu g/l in all tested profiles while metribuzine always exceeded the 0.1 mu g/l threshold value. (C) 2008 Elsevier Ltd. All rights reserved.
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