A comparison of five pesticides adsorption and desorption processes in thirteen contrasting field soils

被引:190
作者
Boivin, A
Cherrier, R
Schiavon, M
机构
[1] USDA ARS, George E Brown Jr Salin Lab, Riverside, CA 92507 USA
[2] INRA, ENSAIA, INPL, UMR 1120,Lab Sols & Environm, F-54505 Vandoeuvre Les Nancy, France
关键词
pesticide; soil; sorption; desorption; regression;
D O I
10.1016/j.chemosphere.2005.03.024
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Batch adsorption and desorption experiments were performed using thirteen agricultural soil samples and five pesticides. Experimental data indicated a gradient in pesticide adsorption on soil: trifluralin >> 2,4-D > isoproturon > atrazine >> bentazone. Atrazine, isoproturon and trifluralin adsorption were correlated to soil organic matter content (1.2 = 0.7, 0.82, 0.79 respectively). Conversely, bentazone adsorption was governed by soil pH (r(2) = 0,68) while insignificant effect has been shown in the case of 2,4-D. Multiple linear regressions were used to combine relationships between the various soil parameters and the Freundlich adsorption coefficient (K-r) of each pesticide. Then desorption was assessed since it may reflect some of the interactions involved between the pesticides and the soil components. Adsorbed molecules were released into aqueous solution in the following order: bentazone > atrazine > isoproturon > 2,4-D > trifluralin. The occurrence of hysteresis did not allow an accurate interpretation of the pesticide desorption data because of the possible interplay of several processes. (C) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:668 / 676
页数:9
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