文献类型： 外文期刊

第一作者： Zheng, SQ

作者： Zheng, SQ;Cooper, JF

作者机构：

期刊名称：ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY （ 影响因子：2.804； 五年影响因子：3.399 ）

ISSN： 0090-4341

年卷期： 1996 年 30 卷 1 期

页码：

收录情况： SCI

摘要： Adsorption, desorption, and degradation of two herbicides (metolachlor and pendimethalin) and a nematicide (cadusafos) were evaluated under laboratory conditions with six soils (ferralsol, regosol, andosol, fluvisol, and two vertisols), selected in a tropical zone (Martinique, French West Indies) and in the Mediterranean area (Languedoc, South of France). Adsorption parameters were calculated using the Freundlich equation, and desorption parameters were evaluated using a 2-compartment model corresponding to two different energy levels. Degradation rate was calculated with a first order equation. Combining values of Koc and half-life in soil, an estimation of the mobility of these pesticides in the soil was made using GUS (ground water ubiquity score). Consideration of pesticide adsorption and resistance to desorption allowed classification of these three compounds according to their mobility: pendimethalin < cadusafos < metolachlor. This classification correlates with some physico-chemical properties of the molecules (water solubility and octanol/water partition coefficient). The equations describing these relations were evaluated. Furthermore, the six soils were classified according to their tendency to adsorb the three pesticides: vertisols > ferralsol > regosol > andosol > fluvisol. Clay or sand content (and cation exchange capacity) of the soils clearly affected adsorption-desorption parameters. The degradation study in the six soils did not show significant differences, but revealed the influence of temperature. GUS values indicated that pendimethalin could be considered as a non-leacher compound, and that cadusafos and metolachlor exhibit a moderate tendency to leaching.

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