Influence of dissolved organic matter on sorption and desorption of MCPA in ferralsol

文献类型： 外文期刊

第一作者： Wu, Dongming

作者： Wu, Dongming;Yun, Yonghuan;Jiang, Lei;Wu, Chunyuan;Jiang, Lei;Wu, Chunyuan;Wu, Chunyuan

作者机构：

关键词： 4-chloro-2-methylphenoxyacetic acid;Sorption;Desorption;Ferralsol;Dissolved organic matter

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2018 年 616 卷

页码：

收录情况： SCI

摘要： MCPA (4-chloro-2-methylphenoxyacetic acid) is an acidic herbicide, widely used in paddy fields. The presence of dissolved organic matter (DOM) modifies the sorption-desorption of herbicides in soils. In this study, effects of DOM on sorption-desorption of MCPA were tested using three typical ferralsol soil types from China: rhodic ferralsol, haplic ferralsol and paddy soil. DOM preparations were extracted from the paddy soil (DOMP), from a compost mixture of cassava stems with chicken manure (DOMC), and from rice straw (DOMR). Sorption-desorption of MCPA in the tested soil types was shown to follow pseudo first-order kinetics, and the calculated isotherm data fitted well with a Freundlich equilibrium model in the range of the studied concentrations. MCPA was weakly sorbed by the soils, producing low Freundlich coefficient values (K-f) (0.854 to 4.237). The presence of DOM reduced the K-f whereby DOMC had the strongest and DOMR the weakest effect. Presence of DOM also promoted MCPA desorption from the soils, again with DOMC having the strongest effect and DOMR the weakest. DOM coating changed the soil particle surface, as demonstrated by electron microscopy, and DOM also directly interacted with MCPA, as shown by Fourier-transform infrared spectroscopy. The experimental data were interpreted to suggest a competing sorption of DOM to ferralsol and an increased solubility of MCPA in the presence of DOM. The results indicate that the environmental risk of MCPA leaching to groundwater and surface flow is increased by presence of DOM, for instance as a result of organic fertilizer use. (c) 2017 Published by Elsevier B.V.

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