粘土矿物、腐殖酸对异丙甲草胺的吸附

Adsorption of Herbicide Metolachlor on Clay and Humic acid

除草剂异丙甲草胺被粘土矿(钙蒙脱石)、土壤腐殖酸的吸附研究,表明异丙甲草胺在钙蒙脱石及腐殖酸上的吸附等温线符合Freundlich方程。异丙甲草胺在钙蒙脱石和腐殖酸不同比例的复合物上吸附的研究,表明钙蒙脱石与腐殖酸的相互作用,降低了自身对农药的吸附。研究中初步讨论了其作用机理。

Adsorption of Herbicide metolachlor, chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl) acetamide, on homonionic clays, humic acids and their complexes have been studied. Adsorption data on Ca-c!ay and humic acids could fit Freundlich-type equation. The K value of Freundlich equation on Ca-clay and humic acids were 2.48 and 2.07 respectively. The interaction mechanisms between metolachlor to Ca-clay with humic acids were discussed. Because of interacting Ca-clay with humic acids, adsorption of metolachlor on the complex of clay with humic acids was less than clay and humic acids alone.