Contribution of organic matter to metolachlor adsorption on some soils

he adsorption of Metolachlor2- chioro-N-(2- ethyl-6-methylphenyl)- N-(2-inethoxy-1- methylenthyl)acetamide] on different soils of various physical and chemical properties was studied. Adsorp- tion isotherms were conformed to the Freundlich equation,The K f values increased in the order of increasing organic carbon content of the soils,The adsorption was found to be correlated to organic matter content better than to other soil properties, and decreased weakly with increasing pH. However,variations in Koc values of about four orders of magnitude have been observed within three natural soils,Instead,for a given soil,the Koc values temained essentially unchanged after fowering the carhan content by H_2O_2 oxidation.