Kinetic sorption characteristics of hexachlorobenzene (HCB) on Huangni soil surfaces were investigated by using the kinetic experimental methods.The results indicate that,the amount of HCB adsorbed on soils surfaces were gradually increased as the sorption time prolonged.Sorption rates of HCB on Huangni soils were shown to be biphasic,generally involving a fast initial step,followed by a very low sustained approach to apparent equilibrium.In kinetic experiments,apparent sorption equilibrium was reached in eight days,and kinetic curve could be fitted by Elovich equation,dual constant equation and first order kinetic equation.The correlation coefficient(r) ranged from 0.90 to 0.98.Data fitted by Elovich equation was better than by dual constant equation and first order equation,which indicated energy distributions of HCB adsorption onto the soil surface were nonhomogeneous,and the process of HCB adsorbed onto soil involving surfaces sorption and intraparticle diffusion.