PMID: 18186336Jan 12, 2008Paper

Equilibrium solubility and dissolution rate of the lead phosphate chloropyromorphite

Environmental Science & Technology
Liyun Xie, Daniel E Giammar

Abstract

Phosphate addition to lead-contaminated soils can immobilize lead in situ through the formation of lead phosphate minerals such as chloropyromorphite (Pb5(PO4)3Cl). The long-term stability of lead immobilized in lead phosphate precipitates depends on the equilibrium solubility and dissolution rates of the lead phosphate solids. The equilibrium solubility and dissolution kinetics of chloropyromorphite were quantified in a series of batch and flow-through reactors. Both equilibrium solubility and dissolution rates were strongly affected by pH. Synthetic chloropyromorphite was more soluble than was predicted using a widely cited solubility product for pure chloropyromorphite, an observation that is consistent with several other recent studies. A trace amount of a more soluble lead solid, such as lead hydroxide, in chloropyromorphite could significantly increase dissolved Pb at neutral pH. The pH-dependence of the dissolution rate was examined in flow-through experiments. A dissolution rate law with a single rate constant for synthetic chloropyromorphite and a constant reaction order of 0.65 with respect to [H+] has been determined. The slow dissolution rate of chloropyromorphite relative to other lead minerals and its low solubili...Continue Reading

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Citations

Jan 30, 2010·Archives of Environmental Contamination and Toxicology·Dane T LambRavi Naidu
Aug 21, 2012·Environmental Science & Technology·Roger B Arnold, Marc Edwards
Jul 23, 2013·Environmental Science and Pollution Research International·Justyna TopolskaJohn Rakovan
Apr 15, 2016·Environmental Science & Technology·Sheldon MastersMarc A Edwards
May 31, 2017·Environmental Science & Technology·Benjamin F TruemanGraham A Gagnon
Mar 22, 2019·Environmental Science. Processes & Impacts·Murray B McBrideLudmilla Aristilde
Oct 25, 2013·Journal of Toxicology and Environmental Health. Part B, Critical Reviews·Kirk G ScheckelSophia M Serda
May 6, 2020·Environmental Monitoring and Assessment·Daniel Ramos PontoniVerediana Fernanda Cherobim
Jan 6, 2021·Environmental Science. Processes & Impacts·Yuting ZhouMurray B McBride
Nov 11, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Shujuan ZhangXiaoguang Meng

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