Heavy metal adsorption on the Le An River sediment —The adsorption model

In this study,the surface properties and adsorption properties of the Le An River sedi-ment were modelled via surface complexation approach.The model parameters were determinedbased on the data of our potentiometric titration experiments and the metal adsorption experimentswith the Le An River sediment samples.Consequently,the surface complexation models for thenatural sediment,in our case the Le An River sediments,which can interpret the experimental datavery well were successfully established.Three typical surface complexation models that is the con-stant capacitance model,the diffuse layer model and the triple layer model,were considered in thisresearch.This work indicated that the consistency and the interdependency among model parame-ters together with the selection of the surface adsorbed species should be emphasized.