Abstract
A platinum-lined, flowing autoclave facility is used to investigate the solubility/phase behavior of zinc(II) oxide in aqueous sodium phosphate solutions at temperatures between 17 and 287°C. ZnO solubilities are observed to increase continuously with temperature and phosphate concentration. At higher phosphate concentrations, a solid phase transformation to NaZnPO4 is observed. NaZnPO4 solubilities are retrograde with temperature. The measured solubility behavior is examined via a Zn(II) ion hydrolysis/complexing model and thermodynamic functions for the hydrolysis/complexing reaction equilibria are obtained from a least-squares analysis of the data. The existence of two new zinc(II) ion complexes, Zn(OH)2(HPO4)2− and Zn(OH)3(H2PO4)2−, is reported for the first time. A summary of thermochemical properties for species in the systems ZnO−H2O and ZnO−Na2O−P2O5−H2O is also provided.
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Ziemniak, S.E., Jones, M.E. & Combs, K.E.S. Zinc(II) oxide solubility and phase behavior in aqueous sodium phosphate solutions at elevated temperatures. J Solution Chem 21, 1153–1176 (1992). https://doi.org/10.1007/BF00651861
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DOI: https://doi.org/10.1007/BF00651861