异丙草胺丁草胺和异丙甲草胺在土壤中的吸附行为研究

Adsorption Behavior of Propisochlor,Butachlor and Metolachlor in Soils

针对北京地区和福建地区土壤中异丙草胺与丁草胺、异丙甲草胺的吸附性差异,采用Freund lich方程,对其吸附等温线进行描述,对Freund lich方程吸附常数Kd与土壤的理化性质相关性进行分析,并对这3种除草剂的环境危害性进行了评价。研究结果表明,同一种农药在较高有机质含量土壤中吸附性更强,同一种土壤中,异丙草胺的吸附性小于丁草胺吸附性,但高于异丙甲草胺,为进一步研究除草剂的有效利用以及在水环境中的危害提供了理论数据。

The adsorption behavior of three herbicides propisochlor,butachlor and metolachlor in two soils from Beijing area and Fujian Province were studied using batch equilibration technique.It was found that adsorption isotherms could fit Freundlich equation(Cs=K_dCe^1_n)) well.From Freundlich equation logarithm modl(log Cs =1/n×logCe+logK_d),the adsorption coeffiient(K_d) of metolachlor,propisochlor and butachlor were 4.314 2,5.940 2 and 33.7132 respectively in the soil of Beijing area the were 5.304,9.440 6 and 105.560 2 respectively in soil of Fujian Province.Analysis between adsorption coeffiient(K_d and the physical and chemical properties of the two soils showed that the organic matter content of soil was factor in the adsorption capacity of propisochlor between butachlor and metolachlor of butachlor er than propisochlor and metolachlor.This study was very helpful to understand the leaching of three herbicides to groundwater.