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- W2333509726 abstract "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." @default.
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- W2333509726 date "2011-02-15" @default.
- W2333509726 modified "2023-10-01" @default.
- W2333509726 title "Determination of PbO<sub>2</sub> Formation Kinetics from the Chlorination of Pb(II) Carbonate Solids via Direct PbO<sub>2</sub> Measurement" @default.
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- W2333509726 doi "https://doi.org/10.1021/es1039826" @default.
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