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首页> 外文期刊>Environmental Science & Technology >Determination of PbO_2 Formation Kinetics from the Chlorination of Pb(ll) Carbonate Solids via Direct PbO_2 Measurement
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Determination of PbO_2 Formation Kinetics from the Chlorination of Pb(ll) Carbonate Solids via Direct PbO_2 Measurement

机译：通过直接测量PbO_2由碳酸铅（II）固体氯化确定PbO_2形成动力学

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摘要

Lead dioxide (PbO_2), a new form of lead corrosion product discovered in the distribution system, is formed via the chlorination of Pb(II) solids and plays an important role in regulating lead concentration in drinking water. The kinetics of its formation, however, has not been quantitatively determined primarily because of the difficulties in accurately measuring PbO_2 concentration. In this study, we apply an iodometric method for direct PbO_2 measurement to determine its formation kinetics from the chlorination of cerussite (PbCO_3) and hydrocerussite (Pb_3(CO_3)_2(OH)_2). The obtained rate equations suggest that for both Pb(II) carbonate solids, the formation of PbO_2 is first-order with respect to the available Pb(II) solid surface area, free chlorine concentration, and OH~- concentration. Dissolved inorganic carbon concentration (DIC) was found to inhibit PbO_2 formation because of the formation of carbonate-lead surface complexes that protect the surface Pb(II) sites from oxidation. The rate of PbO_2 formation from the chlorination of hydrocerussite was faster than that of cerussite under the same Pb(II) solid loading. However, after normalization of the surface area, the rate constants obtained for both Pb(II) solids are similar. The kinetics of PbO_2 formation is elucidated for the first time in this study.
机译：二氧化铅（PbO_2）是配电系统中发现的一种新型形式的铅腐蚀产物，它是通过对Pb（II）固体进行氯化而形成的，在调节饮用水中的铅浓度中起着重要作用。然而，其形成的动力学主要由于准确测量PbO_2的浓度困难而尚未定量。在这项研究中，我们采用碘量法直接测量PbO_2，以确定其由铜矿（PbCO_3）和水铜矿（Pb_3（CO_3）_2（OH）_2）的氯化反应形成的动力学。所获得的速率方程表明，对于两种碳酸铅（II）固体，相对于可用的铅（II）固体表面积，游离氯浓度和OH〜-浓度，PbO_2的形成都是一级的。发现溶解的无机碳浓度（DIC）抑制了PbO_2的形成，因为形成了保护表面Pb（II）部位免受氧化的碳酸盐-铅表面复合物。在相同的Pb（II）固体载量下，水铁矿氯化生成PbO_2的速率比铜铁矿快。但是，在将表面积归一化之后，两种Pb（II）固体的速率常数都相似。在本研究中首次阐明了PbO_2形成的动力学。

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  • 来源
    《Environmental Science & Technology》 |2011年第6期|p.2338-2344|共7页
  • 作者

    Yuanyuan Zhang; Yi-Pin Lin;

  • 作者单位

    Department of Civil and Environmental Engineering, Faculty of Engineering Singapore-Peking-Oxford Research Enterprise (SPORE), National University of Singapore, Singapore 119077;

    rnDepartment of Civil and Environmental Engineering, Faculty of Engineering Singapore-Peking-Oxford Research Enterprise (SPORE), National University of Singapore, Singapore 119077;

  • 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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