Sorption behaviors of benzene and toluene to soils

The sorption of components of crude oil to soils affects their transport and transformation.In this study,batch experiments were carried out to investigate the sorption and competitive sorption of benzene and toluene to soils with different amounts of organic carbon.The results of single-solute solution experiments showed that the sorption of single compound to soils could be described by a linear sorption isotherm,and the sorption capacity was proportional to the soil organic carbon content.In bi-solute solution experiments,competitive sorption of solutes was observed,which caused a decrease of sorption capacity of target compound in comparison with single-solute cases.In addition to partition process,the competitive sorption results indicated that the specific sites probably played an important role in the sorption of organic compounds on the solid surface.