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Impact of Orthophosphate on the Solubility and Properties of Lead Orthophosphate Nanoparticles

Formal, Casey
http://orcid.org/0000-0002-5483-2967
http://rave.ohiolink.edu/etdc/view?acc_num=ucin16497628079667

Abstract Details

2022, MS, University of Cincinnati, Engineering and Applied Science: Environmental Science.
Drinking water utilities often use orthophosphate (PO43-) as a corrosion control treatment when faced with high lead (Pb) levels. PO43- corrosion control reduces Pb solubility by forming relatively insoluble lead phosphate (Pb-PO4) minerals. In some cases, these Pb-PO4 minerals have been observed in the form of nanoparticles that have been able to pass through consumer taps. Little is understood about the properties of these Pb-PO4 nanoparticles. For that reason, Pb precipitation experiments were conducted to generate Pb-PO4 nanoparticles in bench scale studies so that they could be analysed. The objective of this work was to observe how pH, dissolved inorganic carbon (DIC) and PO43- impacted the properties and solubility of Pb-PO4 particles. Specifically, particle size, surface charge, mineralogy, and solubility were analysed. Hydrocerussite was precipitated when no PO43- was present in the system, hydroxypyromorphite (Pb5(PO4)3OH) nanoparticles (100 nm diameter) were precipitated when excess PO43- was present, and a mixture of the two minerals was precipitated when an insufficient amount of PO43- was present. Hydroxypyromorphite particles were less soluble than hydrocerussite by up to two orders of magnitude. Previously reported solubility constants for hydroxypyromorphite did not fit the solubility results in this study. A new solubility constant of Ksp= 10-67.96 was calculated based on experimental data. Hydroxypyromorphite particles would not settle in water which was likely due to their small size and high negative charge. The mobility and size of these particles indicates that there are potential implications for particulate lead to remain suspended in water and make it through drinking water taps.
Dionysios Dionysiou, Ph.D. (Committee Member)
George Sorial, Ph.D. (Committee Member)
Darren Lytle, Ph.D. (Committee Member)
53 p.
Water Resource Management
Drinking Water; Lead; Nanoparticles; Pyromorphite; corrosion control; Phosphate

Recommended Citations

Citations

  • Formal, C. (2022). Impact of Orthophosphate on the Solubility and Properties of Lead Orthophosphate Nanoparticles [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin16497628079667

    APA Style (7th edition)

  • Formal, Casey. Impact of Orthophosphate on the Solubility and Properties of Lead Orthophosphate Nanoparticles. 2022. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin16497628079667.

    MLA Style (8th edition)

  • Formal, Casey. "Impact of Orthophosphate on the Solubility and Properties of Lead Orthophosphate Nanoparticles." Master's thesis, University of Cincinnati, 2022. http://rave.ohiolink.edu/etdc/view?acc_num=ucin16497628079667

    Chicago Manual of Style (17th edition)

ucin16497628079667
55
© 2021, some rights reserved.Creative Commons License Impact of Orthophosphate on the Solubility and Properties of Lead Orthophosphate Nanoparticles by Casey Formal is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Cincinnati and OhioLINK.
Release 3.2.12