阿维菌素在不同类型土壤中的吸附研究

Study on the adsorption of abamectin in soils

采用Freundlich吸附等温方程研究了阿维菌素在不同类型土壤中的吸附。结果表明：阿维菌素的吸附等温线均为直线，说明吸附可能与其在土壤有机质中的分配作用有关；土壤有机质含量是影响阿维菌素土壤吸附的最重要因子，吸附系数与有机质含量呈正相关；阿维菌素有机质吸附常数平均值为2369，185，吸附自由能为17．25～20．59kJ·mol^-1；降低水土比可以增加阿维菌素在腐殖酸和土壤中的吸附。

The adsorption of abamcctin in soils was studied with Freundlich equation. The results showed that the adsorption isotherms for abamectin were all beeline in four kinds： of soils, maybe which indicated that the adsorption was related to the distribution action of abamectin in soil organic matter; organic matter content of soil was the most important factor affecting abamectin adsorption in soil, and adsorption coefficient positively correlated with organic matter content; Adsorption constant of organic matter of abamectin averaged 2 369.185, and the free energies of abamectin adsorption were 17.25-20.59 kJ · mol^-1; And higher adsorption in humic acid and soil with the decrease of solution/soil ratio had been found.