Adsorption characteristics of pesticides methamidophos and glyphosate by two soils.
Adsorption characteristics of pesticides methamidophos and glyphosate by two soils.
复制标题
DOI：
10.1016/j.chemosphere.2004.08.064
复制
发表时间：
2005-02
期刊：
影响因子：
8.8
通讯作者：
Yingtao Yu;Qixing Zhou
中科院分区：
文献类型：
--
作者：
Yingtao Yu;Qixing Zhou
通过比较土壤去除有机质前后甲胺磷(MDP)和草甘膦(GPS)吸附的变化，评价了土壤中有机质和矿物质的贡献。两种土壤对MDP和GPS的吸附等温线均符合Freundlich方程，土壤对GPS的吸附容量大于MDP。从Freundlich方程和吸附容量计算得出，由于有机质的去除，土壤对MDP和GPS的吸附Kf值分别降低了46.1%和75.0%，而潮土则分别降低了34.9%和52.5%。研究结果表明，土壤有机质对GPS的吸附贡献较大，但土壤矿物可以为MDP提供更多的有效吸附场所。
Contributions of organic matter and minerals in soil were evaluated by comparing changes in adsorption of methamidophos (MDP) and glyphosate (GPS) before and after removal of organic matter from argaltoll (mollisol) and typustalf (alfisol) soils. Adsorption isotherms of MDP and GPS by the two soils comforted to Freundlich equation, and the adsorption capacity of GPS by argaltoll soil was higher than that of MDP. Due to the removal of organic matter from soils, Kfvalues of MDP and GPS adsorbed by argaltoll soil, which were calculated from Freundlich equations and the measure of adsorption capacity, decreased by 46.1% and 75.0%, and these by typustalf soil decreased by 34.9% and 52.5%, respectively. Results from this study suggested that soil organic matter made greater contributions to adsorption of GPS, but soil minerals could provide more available adsorption sites for MDP.