Kinetics of the reductive dissolution of lead(IV) oxide by iodide.
Kinetics of the reductive dissolution of lead(IV) oxide by iodide.
复制标题
碘化物还原溶解氧化铅 (IV) 的动力学。
DOI：
10.1021/es2038905
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发表时间：
2012
影响因子：
11.4
通讯作者：
D. Giammar
中科院分区：
文献类型：
--
作者：
Yin Wang;Jiewei Wu;D. Giammar
氧化铅 (IV) (PbO(2)) 是一种腐蚀产物，存在于用于输送饮用水的铅服务管线中。还原剂的存在可以加速 PbO(2) 溶解并增强铅向饮用水中的释放。 PbO(2) 的溶解速率而不是平衡溶解度可以控制通过含有 PbO(2) 的管道分配的水中溶解的铅浓度。碘化物是一种已知的 PbO(2) 还原剂，被选为模型还原剂，用于研究 PbO(2) 还原溶解的动力学和机制。使用连续搅拌釜反应器测定了铂矿（β-PbO(2)）的溶解速率作为pH、碘化物浓度和溶解无机碳（DIC）浓度的函数。铂矿的溶解速率随着pH值的降低和碘化物浓度的增加而增加。 10 mg C/L DIC 的存在加速了铂矿的溶解，但 DIC 浓度的进一步增加并不影响溶解速率。 PbO(2) 的还原溶解可以解释为一个耦合过程，涉及在 PbO(2) 表面将 Pb(IV) 化学还原为 Pb(II)，然后将 Pb(II) 分离到溶液中。数据表明，化学还原是碘化物存在下 PbO(2) 溶解的限速步骤。
Lead(IV) oxide (PbO(2)) is a corrosion product found in lead service lines used to convey drinking water. The presence of reductants can accelerate PbO(2) dissolution and enhance lead release to drinking water. The dissolution rate rather than the equilibrium solubility of PbO(2) can control the dissolved lead concentrations in water distributed through pipes containing PbO(2). Iodide, a known reductant for PbO(2), was selected as a model reductant for investigating the kinetics and mechanisms of the reductive dissolution of PbO(2). The dissolution rate of plattnerite (β-PbO(2)) was determined as a function of pH, iodide concentration, and dissolved inorganic carbon (DIC) concentration using continuously stirred tank reactors. The dissolution rate of plattnerite increased with decreasing pH and increasing iodide concentrations. The presence of 10 mg C/L DIC accelerated plattnerite dissolution, but further increases in DIC concentration did not affect the dissolution rate. The reductive dissolution of PbO(2) can be interpreted as a coupled process involving chemical reduction of Pb(IV) to Pb(II) at the PbO(2) surface followed by detachment of Pb(II) to solution. The data suggest that chemical reduction is the rate-limiting step for PbO(2) dissolution in the presence of iodide.
影响因子：
11.4
作者：
Ulrich, Kai-Uwe;Singh, Abhas;Schofield, Eleanor J.;Bargar, John R.;Veeramani, Harish;Sharp, Jonathan O.;Bernier-Latmani, Rizlan;Giammar, Daniel E.
通讯作者：
Giammar, Daniel E.