Solubility of litharge (α-PbO) in alkaline media at elevated temperatures

S. E. Ziemniak; D. A. Palmer; P. Bénézeth; L. M. Anovitz

doi:10.1007/s10953-005-8515-x

Solubility of litharge (α-PbO) in alkaline media at elevated temperatures

S. E. Ziemniak, D. A. Palmer, P. Bénézeth, L. M. Anovitz

Geochemistry & Interfacial Science

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

An inert, flowing autoclave facility was used to investigate the solubility behavior of α-PbO (litharge, tetragonal) in aqueous solutions of morpholine, ammonia and sodium hydroxide between 38 and 260°C. Lead solubilities increased from about 0.4 mmol-kg^-1 at 38°C to about 4.5 mmol-kg^-1 at 260°C and were relatively insensitive to the concentration and identity of the reagent used to control the pH. The measured lead solubilities were interpreted using a Pb(II) ion hydroxocomplexing model and thermodynamic functions for these equilibria were obtained from a least-squares analysis of the data. A consistent set of thermodynamic properties for the species Pb(OH)⁺, Pb(OH)₂(aq) and Pb(OH) ₃^- was obtained that will permit accurate lead oxide solubility calculations to be made over broad ranges of temperature and alkalinity.

Original language	English
Pages (from-to)	1407-1428
Number of pages	22
Journal	Journal of Solution Chemistry
Volume	34
Issue number	12
DOIs	https://doi.org/10.1007/s10953-005-8515-x
State	Published - Dec 2005

Keywords

Equilibrium constant
Hydrothermal solutions
Lead(II) hydrolysis
Lead(II) oxide
Litharge, aqueous solutions
Pressurized water

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10.1007/s10953-005-8515-x

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title = "Solubility of litharge (α-PbO) in alkaline media at elevated temperatures",

abstract = "An inert, flowing autoclave facility was used to investigate the solubility behavior of α-PbO (litharge, tetragonal) in aqueous solutions of morpholine, ammonia and sodium hydroxide between 38 and 260°C. Lead solubilities increased from about 0.4 mmol-kg-1 at 38°C to about 4.5 mmol-kg-1 at 260°C and were relatively insensitive to the concentration and identity of the reagent used to control the pH. The measured lead solubilities were interpreted using a Pb(II) ion hydroxocomplexing model and thermodynamic functions for these equilibria were obtained from a least-squares analysis of the data. A consistent set of thermodynamic properties for the species Pb(OH)+, Pb(OH)2(aq) and Pb(OH) 3- was obtained that will permit accurate lead oxide solubility calculations to be made over broad ranges of temperature and alkalinity.",

keywords = "Equilibrium constant, Hydrothermal solutions, Lead(II) hydrolysis, Lead(II) oxide, Litharge, aqueous solutions, Pressurized water",

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AU - Ziemniak, S. E.

AU - Palmer, D. A.

AU - Bénézeth, P.

AU - Anovitz, L. M.

PY - 2005/12

Y1 - 2005/12

N2 - An inert, flowing autoclave facility was used to investigate the solubility behavior of α-PbO (litharge, tetragonal) in aqueous solutions of morpholine, ammonia and sodium hydroxide between 38 and 260°C. Lead solubilities increased from about 0.4 mmol-kg-1 at 38°C to about 4.5 mmol-kg-1 at 260°C and were relatively insensitive to the concentration and identity of the reagent used to control the pH. The measured lead solubilities were interpreted using a Pb(II) ion hydroxocomplexing model and thermodynamic functions for these equilibria were obtained from a least-squares analysis of the data. A consistent set of thermodynamic properties for the species Pb(OH)+, Pb(OH)2(aq) and Pb(OH) 3- was obtained that will permit accurate lead oxide solubility calculations to be made over broad ranges of temperature and alkalinity.

AB - An inert, flowing autoclave facility was used to investigate the solubility behavior of α-PbO (litharge, tetragonal) in aqueous solutions of morpholine, ammonia and sodium hydroxide between 38 and 260°C. Lead solubilities increased from about 0.4 mmol-kg-1 at 38°C to about 4.5 mmol-kg-1 at 260°C and were relatively insensitive to the concentration and identity of the reagent used to control the pH. The measured lead solubilities were interpreted using a Pb(II) ion hydroxocomplexing model and thermodynamic functions for these equilibria were obtained from a least-squares analysis of the data. A consistent set of thermodynamic properties for the species Pb(OH)+, Pb(OH)2(aq) and Pb(OH) 3- was obtained that will permit accurate lead oxide solubility calculations to be made over broad ranges of temperature and alkalinity.

KW - Equilibrium constant

KW - Hydrothermal solutions

KW - Lead(II) hydrolysis

KW - Lead(II) oxide

KW - Litharge, aqueous solutions

KW - Pressurized water

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EP - 1428

JO - Journal of Solution Chemistry

JF - Journal of Solution Chemistry

IS - 12

ER -

Solubility of litharge (α-PbO) in alkaline media at elevated temperatures

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Keywords

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