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首页> 外文期刊>Environmental Science & Technology >Reduction of Lead Oxide (PbO_2) by Iodide and Formation of lodoform in the PbO_2/I~-/NOM System
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Reduction of Lead Oxide (PbO_2) by Iodide and Formation of lodoform in the PbO_2/I~-/NOM System

机译：在PbO_2 / I〜-/ NOM体系中碘化物还原氧化铅（PbO_2）和形成碘仿

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摘要

Lead oxide (PbO_2) can be an important form of lead mineral scale occurring in some water distribution systems. It is believed to be formed by the oxidation of lead-containing plumbing materials by free chlorine. Its reactivity in water, however, has not been well studied. Iodide is also found in source drinking waters, albeit at low concentrations. Consideration of thermodynamics suggests that iodide can be oxidized by PbO_2. In this investigation, iodide ion was used as a probe compound to study the reduction of PbO_2 and the formation of iodoform, which has been predicted to be a carcinogen, in the presence of natural organic matter (NOM). The reduction of PbO_2 by iodide can be expressed as PbO_2 + 31~- + 4H~+ → Pb~(2+) + l_3~- + 2H_2O, and the reaction kinetics has been determined in this study. In the presence of NOM, I3" reacts with NOM to form iodoform and its concentration is proportional to the NOM concentration. Our results indicate that PbO_2 is a very powerful oxidant and can possibly serve as an oxidant reservoir for the formation of iodinated disinfection byproduct through a novel reaction pathway.
机译：氧化铅（PbO_2）是某些水分配系统中铅矿物质垢的重要形式。据信这是由游离氯将含铅管道材料氧化而形成的。然而，其在水中的反应性尚未得到很好的研究。碘化物也存在于饮用水中，尽管浓度很低。热力学的考虑表明碘化物可被PbO_2氧化。在这项研究中，使用碘离子作为探针化合物来研究在天然有机物（NOM）存在下PbO_2的还原和碘仿的形成（据预测是致癌物）。碘化物还原PbO_2可以表示为PbO_2 + 31〜-+ 4H〜+→Pb〜（2+）+ l_3〜-+ 2H_2O，并确定了反应动力学。在NOM存在下，I3“与NOM反应形成碘仿，其浓度与NOM浓度成正比。我们的结果表明，PbO_2是一种非常强大的氧化剂，并可能通过形成碘化消毒副产物而成为氧化剂。一种新颖的反应途径。

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