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首页> 外文期刊>Environmental Science & Technology >Role of Pb(Ⅱ) Defects in the Mechanism of Dissolution of Plattnerite (β-PbO_2) in Water under Depleting Chlorine Conditions
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Role of Pb(Ⅱ) Defects in the Mechanism of Dissolution of Plattnerite (β-PbO_2) in Water under Depleting Chlorine Conditions

机译：贫氯条件下Pb（Ⅱ）缺陷在辉石（β-PbO_2）溶解机理中的作用

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摘要

Destabilization of lead corrosion scales present in plumbing materials used in water distribution systems results in elevated lead concentrations in drinking water. Soluble lead release caused by changes in water chemistry has been linked to dissolution of lead carbonate and/or lead oxide solid phases. Although prior studies have examined the effects of varying water chemistry on the dissolution of plattnerite (β-PbO_2), β-PbO_2 dissolution under depleting chlorine conditions is poorly understood. This paper reports results obtained for long-term batch dissolution experiments for solid phase β-PbO_2 under depleting chlorine conditions. Results indicate that the initial availability of free chlorine effectively depresses dissolved lead concentrations released from β-PbO_2. However, the dissolved lead levels remained low (～4 μg/L) even after free chlorine was depleted. Detailed spectroscopic characterization of solid samples collected during the β-PbO_2 experiments indicates that changes in the electronic structure of PbO_2 occurred during the dissolution. This further points out that Pb~(2+) defects present in crystalline β-PbO_2 play a dominant role in the dissolution of this solid phase.
机译：水分配系统中使用的管道材料中存在的铅腐蚀垢的不稳定导致饮用水中铅的浓度升高。由水化学变化引起的可溶性铅释放与碳酸铅和/或氧化铅固相的溶解有关。尽管先前的研究已经检查了水化学变化对白铁矿（β-PbO_2）溶解的影响，但对于贫氯条件下β-PbO_2的溶解了解却很少。本文报道了在贫氯条件下固相β-PbO_2的长期批量溶解实验获得的结果。结果表明，游离氯的初始可用性有效地抑制了由β-PbO_2释放的溶解的铅浓度。然而，即使游离氯被消耗掉了，溶解的铅水平仍然很低（〜4μg/ L）。在β-PbO_2实验期间收集的固体样品的详细光谱表征表明，PbO_2的电子结构发生了变化。这进一步指出存在于晶体β-PbO_2中的Pb〜（2+）缺陷在固相溶解中起主要作用。

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  • 来源
    《Environmental Science & Technology》 |2014年第21期|12525-12532|共8页
  • 作者

    Daoping Guo; Clare Robinson; Jose E. Herrera;

  • 作者单位

    Department of Civil and Environmental Engineering, Western University, London, Ontario, Canada N6A 5B9;

    Department of Civil and Environmental Engineering, Western University, London, Ontario, Canada N6A 5B9;

    Department of Civil and Environmental Engineering, Western University, London, Ontario, Canada N6A 5B9;

  • 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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