Copper(II) oxide solubility behavior in aqueous sodium phosphate solutions at elevated temperatures
A platinum-lined, flowing autoclave facility is used to investigate the solubility behavior of copper(II) oxide (CuO) in aqueous sodium phosphate solutions at temperatures between 292 and 535 K. Copper solubilities are observed to increase continuously with temperature and phosphate concentration. The measured solubility is examined via a Cu(II) ion hydrolysis/complexing model and thermodynamic functions for the hydrolysis/complexing reactions are obtained from a least- squares analysis of the data. Altogether, thermochemical properties are established for five anionic complexes: Cu(OH){sub 3}{sup {minus}}, Cu(OH){sub 4}{sup =}, Cu(OH){sub 2}(HPO{sub 4}){sup =}, Cu(OH){sub 3}(H{sub 2}PO{sub 4}){sup =}, and Cu(OH){sub 2}(PO{sub 4}){sup {identical to}}. Precise thermochemical parameters are also derived for the Cu(OH){sup +} hydroxocomplex based on CuO solubility behavior previously observed in pure water (*) at elevated temperatures. The relative ease of Cu(II) ion hydrolysis is such that Cu(OH){sub 3}{sup {minus}} species become the preferred hydroxocomplex for pH {ge} 9.4. 20 refs., 8 figs., 6 tabs.
- Research Organization:
- Knolls Atomic Power Lab., Schenectady, NY (USA)
- Sponsoring Organization:
- DOE/NE
- DOE Contract Number:
- AC12-76SN00052
- OSTI ID:
- 6815531
- Report Number(s):
- KAPL-4715; ON: DE90011785
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360105 -- Metals & Alloys-- Corrosion & Erosion
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
CHALCOGENIDES
COMPLEXES
COPPER COMPOUNDS
COPPER OXIDES
DISPERSIONS
DISSOCIATION
DISSOLUTION
HYDROGEN COMPOUNDS
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
SODIUM COMPOUNDS
SODIUM PHOSPHATES
SOLUBILITY
SOLUTIONS
THERMODYNAMICS
TRANSITION ELEMENT COMPOUNDS
WATER