The sorption of nonionic pesticides onto clays and the influence of natural organic carbon

摘要

The sorption and desorption of alachlor, metolachlor and linuron onto kaolinite and Na- montmorllointe and the influence of natural organic matter sorbed to these clays was examined. The intensity of adsorption was a function of the herbicide and clay. Sorption isotherms Conformed the Freundlich equation with K_f(ads) values ranging from 1.63 x 10~3 for metholachlor To 2.84 x 10~2 for linuron onto na-montmorillonite. The n values ranged from 0.78 for linuron to 192 for metolachlor. The three herbicides adsorbed to kaolinite to a much lesser xtent.