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Formation of lead(IV) Oxides From lead(II) Compounds

Formation of lead(IV) Oxides From lead(II) Compounds

Yin Wang, Yanjiao Xie, Wenlu Li, Zimeng Wang, Daniel E Giammar

Environ Sci Technol. 2010 Dec 1;44(23):8950-6.

PMID: 21047060

Abstract:

Lead(IV) oxide (PbO(2)) is a corrosion product that can develop on lead pipes used for drinking water supply, and its stability can control lead concentrations in tap water. A set of batch experiments were performed to determine the extent of PbO(2) formation as a function of time, pH, the presence of dissolved inorganic carbon (DIC), and free chlorine concentration. Experiments were conducted with four lead(II) compounds that are precursors of PbO(2) formation: dissolved lead(II) chloride, massicot (β-PbO), cerussite (PbCO(3)), and hydrocerussite (Pb(3)(OH)(2)(CO(3))(2)). While PbO(2) formed in the presence and absence of DIC, the presence of DIC accelerated PbO(2) formation and affected the identity of the PbO(2) (scrutinyite vs plattnerite) product. For some conditions, intermediate solids formed that affected the identity of the PbO(2) produced. When no intermediate solids formed, hydrocerussite led to the formation of pure scrutinyite, and lead(II) chloride and massicot led to mixtures of scrutinyite and plattnerite. Based on the experimental results, a conceptual model of lead(IV) oxide formation pathways was proposed.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP7758954	Lead(II) chloride		7758-95-4	Price

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