Lead(IV) oxide is a corrosion product that develops on lead pipes used for drinking water supply, and its dissolution can control lead concentrations in drinking water. The dissolution rate of PbO2 was quantified as a function of pH and free chlorine concentrations, and the impact of Pb(II) adsorption on the rate was evaluated. Pb(II) adsorption was determined at a variety of pH and initial Pb(II) concentrations. The dissolution rate of PbO2 decreased with increasing pH. Free chlorine inhibited PbO2 dissolution. The extent of Pb(II) adsorption increased with increasing pH and concentrations of Pb(II) until approaching a plateau. The adsorption process was further investigated using lead isotope exchange measurements. A surface complexation model was developed to describe the Pb(II) adsorption using the diffuse double-layer model. The surface complexation model provided a bridge to directly correlate the dissolution of PbO2 with the concentrations of PbO2surface species.

Mechanisms of PbO<sub>2</sub> reductive dissolution: A surface complexation modeling approach

245th National Meeting (2013)

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Mechanisms of PbO2 reductive dissolution: A surface complexation modeling approach

Mechanisms of PbO₂ reductive dissolution: A surface complexation modeling approach