Impact of Cu(II) and Zn(II) on the Reductive Dissolution of Pb(IV) Oxide,Environmental Science & Technology Letters

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Impact of Cu(II) and Zn(II) on the Reductive Dissolution of Pb(IV) Oxide
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2019-11-14 , DOI: 10.1021/acs.estlett.9b00612
Weiyi Pan ₁ , Lia Schattner ₁ , Justin Guilak ₂ , Daniel Giammar ₁

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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.

中文翻译：

Cu（II）和Zn（II）对Pb（IV）氧化物还原溶解的影响

饮用水中溶解的铅（Pb）浓度主要受铅服务管线上腐蚀范围内的含铅矿物质控制。氧化铅（IV）（PbO ₂）固体可以将铅浓度控制在非常低的水平，但它们仅在存在游离氯残余物的情况下才稳定。当游离氯耗尽时，PbO ₂经历还原溶解。锌（Zn）和铜（Cu）可能通过吸附或沉淀过程以影响PbO ₂溶解速率和程度的方式积聚在含铅腐蚀垢中。铜（II）和上的PbO的还原溶解的Zn（II）的效果₂在间歇实验进行了探索用的PbO ₂固体和含水的Cu（II）和Zn（II）。通过研究不同的Cu（II）和Zn（II）负载量（0–4μM）和在不同的pH条件（5.5–9.5）下溶解的Pb（II）浓度，我们发现了Cu（II）和Zn的强大抑制作用（II）关于PbO ₂的还原溶解。Zn（II）表现出比Cu（II）更强的抑制作用。反应后PbO _2的表征与Cu（II）和Zn（II）的吸附一致，从而抑制了PbO _2的溶解。下所研究的所有条件下，α-PBO ₂溶解比β-PBO更快₂。

更新日期：2019-11-14

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