Influence of a heavy rainfall event on the leaching of [C-14]isoproturon and its degradation products in outdoor lysimeters

文献类型： 外文期刊

第一作者： Doerfler, Ulrike

作者： Doerfler, Ulrike;Cao, Guoyin;Grundmann, Sabine;Schroll, Reiner

作者机构：

关键词： isoproturon;soil;outdoor lysimeters;leaching;preferential flow;HERBICIDE ISOPROTURON;FIELD-SCALE;SOIL;TRANSPORT;WATER;AVAILABILITY;PHENYLUREAS;METABOLISM;TRIAZINES;RESIDUES

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： In four different agricultural soils the long-term leaching behaviour of [C-14] isoproturon was studied in outdoor lysimeters (2 m length, 1 m(2) surface area). The herbicide was applied in spring 1997 and spring 2001. At the end of the first 4-year-investigation period between 0.13% and 0.31% of the applied radioactivity was leached. Isoproturon or known metabolites could not be detected in the leachate. However, shortly after the second application isoproturon and its degradation products 2-hydroxy-isoproturon and monodemethyl-isoproturon were leached via preferential flow in one of the lysimeters (Mollic gleysol) in concentrations of 4.5 mu g L-1, 3.1 mu g L-1 and 0.9 mu g L-1, respectively, thus considerably exceeding the EU threshold limit of 0.1 mu g L-1 for ground and drinking water. The results indicate that in soils where mass flow transfer dominates, leaching of isoproturon to groundwater is of low probability whereas in highly structured soils which have the tendency to form macropores, isoproturon can be transported via preferential flow to the groundwater. (c) 2006 Elsevier Ltd. All rights reserved.

分类号： X5

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