Adsorption and Leaching Behavior of Metolachlor in Different Soils
[Objective] The adsorption and leaching behavior of metolachlor in different soils were studied.[Method] The adsorption and leaching of metolachlor in different soils were conducted by batch equilibrium and column leaching experiments.[Result] The adsorption of metolachlor in the tested soils was better fitted by the empirical Freundlich adsorption isotherm,and the adsorption constants (Kf) in Guangxi loam soil,Guangxi loamy clay、Anhui sandy loam were 7.58,3.06 and 3.12.The organic carbon partition coefficients (Koc) were 75.71、35.80 and 34.93,which demonstrated that metolachlor was rather difficult to be adsorbed on the loam soil,the sorption on the loamy clay and sandy loam were difficult degree.The values of adsorption free energy (AG) in the soil samples were ranged from-8.81 to-10.73KJ/mol.And the adsorption belonged to spontaneous and physical process.[Conclusion] Metolachlor in the soil of sandy loam belonged to ‘ Can be leached’ catalog and ‘ difficult to be leached’ catalog in the soils of loam soil,loamy clay.The mobility of metolachlor in sandy loam is more than that of loamy clay and loam soil,which is more likely to cause pollution to groundwater.
NETL
NSTL
万方数据
维普
