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Impact of Cu(II) and Zn(II) on the Reductive Dissolution of Pb(IV) Oxide
Environmental Science & Technology Letters ( IF 7.678 ) Pub Date : 2019-11-14 , DOI: 10.1021/acs.estlett.9b00612
Weiyi Pan, Lia Schattner, Justin Guilak, Daniel Giammar

Dissolved lead (Pb) concentrations in drinking water are mainly controlled by Pb-containing minerals in corrosion scales on lead service lines. Lead(IV) oxide (PbO2) solids can control lead concentrations at very low values, but they are stable only in the presence of a free chlorine residual. When free chlorine is depleted, PbO2 undergoes reductive dissolution. Zinc (Zn) and copper (Cu) may accumulate on lead-containing corrosion scales through adsorption or precipitation processes in ways that affect the rate and extent of PbO2 dissolution. The effects of Cu(II) and Zn(II) on the reductive dissolution of PbO2 were explored in batch experiments with PbO2 solids and aqueous Cu(II) and Zn(II). By investigating dissolved Pb(II) concentrations with different Cu(II) and Zn(II) loadings (0–4 μM) and under different pH conditions (5.5–9.5), we found a robust inhibitory effect of Cu(II) and Zn(II) on the reductive dissolution of PbO2. Zn(II) exhibited inhibition that was stronger than that of Cu(II). Characterization of the PbO2 after reactions was consistent with adsorption of Cu(II) and Zn(II), leading to inhibition of PbO2 dissolution. Under all conditions studied, α-PbO2 dissolved faster than β-PbO2.
更新日期:2019-11-14

 

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