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首页> 外文期刊>Environmental Science & Technology >Role of Manganese in Accelerating the Oxidation of Pb(Ⅱ) Carbonate Solids to Pb(Ⅳ) Oxide at Drinking Water Conditions
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Role of Manganese in Accelerating the Oxidation of Pb(Ⅱ) Carbonate Solids to Pb(Ⅳ) Oxide at Drinking Water Conditions

机译：锰在饮用水条件下加速碳酸铅（Ⅱ）固体氧化为铅（Ⅳ）的作用

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摘要

Pb(II) carbonate solids are corrosion products that form on the inner surfaces of lead service lines (LSLs) and can be oxidized by free chlorine to form Pb(IV) oxide (PbO2). The formation of PbO2 can maintain low dissolved lead concentrations in drinking water, but PbO2 can dissolve if a free chlorine residual is not maintained. Experiments demonstrated that the oxidation of Pb(II) carbonate by free chlorine was faster with manganese (Mn). Without Mn(II), the oxidation of Pb(II) carbonate was an autocatalytic process. With Mn(II), the overall oxidation rate was 2 orders of magnitude faster than without Mn(II). X-ray diffraction and free chlorine consumption profiles indicated that delta-MnO2 was formed within several minutes of the reaction of Mn(II) with free chlorine, and delta-MnO2 catalyzed the oxidation of Pb(II) carbonate by free chlorine. Free chlorine consumption profiles for Pb(II) carbonate with and without Mn(II) were interpreted based on the kinetics and stoichiometry of the underlying chemical reactions. These findings highlight the importance of Mn in accelerating the formation of PbO2 in water with Pb(II) carbonate solids and free chlorine, and it may help explain why PbO2 is observed on LSLs of some but not all water systems that use free chlorine.
机译：碳酸铅（II）固体是在铅服务管线（LSL）的内表面上形成的腐蚀产物，可被游离氯氧化形成氧化铅（IV）（PbO2）。 PbO2的形成可以使饮用水中的铅含量保持较低水平，但是如果不保持游离氯残留，PbO2可以溶解。实验表明，锰（Mn）可使氯气中游离氯氧化碳酸铅（II）的速度更快。没有Mn（II），碳酸Pb（II）的氧化是一种自动催化过程。使用Mn（II）时，总氧化速率比不使用Mn（II）时快2个数量级。 X射线衍射和游离氯消耗曲线表明，在Mn（II）与游离氯反应的几分钟内形成δ-MnO2，δ-MnO2催化游离氯氧化碳酸铅（II）。含或不含Mn（II）的碳酸Pb（II）的游离氯消耗曲线均根据基本化学反应的动力学和化学计量进行了解释。这些发现凸显了Mn在加速碳酸盐和Pb（II）固体与游离氯在水中形成PbO2的重要性，这可能有助于解释为什么在某些但不是全部使用游离氯的水系统的LSL中观察到PbO2的原因。

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  • 来源
    《Environmental Science & Technology》 |2019年第12期|6699-6707|共9页
  • 作者

    Pan Weiyi; Pan Chao; Bae Yeunook; Giammar Daniel;

  • 作者单位

    Washington Univ, Dept Energy Environm & Chem Engn, St Louis, MO 63130 USA;

    Washington Univ, Dept Energy Environm & Chem Engn, St Louis, MO 63130 USA|Lawrence Livermore Natl Lab, Phys & Life Sci, 7000 East Ave, Livermore, CA 94550 USA;

    Washington Univ, Dept Energy Environm & Chem Engn, St Louis, MO 63130 USA;

    Washington Univ, Dept Energy Environm & Chem Engn, St Louis, MO 63130 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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