Square wave anodic stripping voltammetry method to distinguish dissolved and colloidal lead in presence of hematite colloid was studied. Hematite colloid was found to have no effect on the electrochemical determination of the lead ion. The variations in peak current with shake time

pH and added lead concetration of presence of colloid were consistent with adsorptive dynamic curve

pH curve and isotherm by separating solid and liquid phases method. The peak current variation reflected the change of lead ion in solution. The titration curve of hematite colloid suspension with lead ion is similar to that of dissolved ligand. So we can determine the adsorptive capacity of colloid suspension by eletroanalytical mehtod.