Effects of pH and carbonate concentration on dissolution rates of the lead corrosion product PbO(2).
Effects of pH and carbonate concentration on dissolution rates of the lead corrosion product PbO(2).
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pH值和碳酸盐浓度对铅腐蚀产物PbO(2)溶解速率的影响。
DOI：
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发表时间：
2010
影响因子：
11.4
通讯作者：
D. Giammar
中科院分区：
文献类型：
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作者：
Yanjiao Xie;Yin Wang;Vidhi Singhal;D. Giammar
氧化铅（IV）是一种腐蚀产物，可以在铅管上形成，并影响饮用水中的铅浓度。使用连续搅拌的流通式反应器来量化在不同pH值和溶解的无机碳（DIC）浓度下的片钠石（β-PbO（2））的溶解速率。没有使用有机pH缓冲液，因为发现几种是PbO（2）的还原剂，加速了它的溶解。大多数片钠长石溶解速率在10（-10）mol/min·m（2）的量级。溶出速率随pH值降低和DIC增加而增加。DIC的效果是一致的还原溶解机制，涉及减少铅（IV），铅（II）在片钠石表面，然后形成可溶性铅（II）-碳酸盐络合物，加速铅（II）从表面释放。在实验条件下，溶解铅浓度控制的溶解速率的片钠石，而不是由其平衡溶解度。开发了溶解速率模型，并可用于预测作为pH和DIC的函数的钙钛矿的溶解速率。
Lead(IV) oxide is a corrosion product that can develop on lead pipes and affect lead concentrations in drinking water. Continuously stirred flow-though reactors were used to quantify the dissolution rates of plattnerite (beta-PbO(2)) at different pH values and dissolved inorganic carbon (DIC) concentrations. Organic pH buffers were not used, because several were found to be reductants for PbO(2) that accelerated its dissolution. Most plattnerite dissolution rates were on the order of 10(-10) mol/min-m(2). The rate of dissolution increased with decreasing pH and with increasing DIC. The effect of DIC is consistent with a reductive dissolution mechanism that involves the reduction of Pb(IV) to Pb(II) at the plattnerite surface followed by the formation of soluble Pb(II)-carbonate complexes that accelerate Pb(II) release from the surface. Under the experimental conditions, dissolved lead concentrations were controlled by the dissolution rate of plattnerite and not by its equilibrium solubility. A dissolution rate model was developed and can be used to predict dissolution rates of plattnerite as a function of pH and DIC.
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.