Solubility equilibrium constant of α-hopeite |
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| Authors: | Jerome O Nriagu |
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| Affiliation: | Department of the Environment, Canada Centre for Inland Waters, Burlington, Ontario, Canada |
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| Abstract: | The saturation curve for synthetic α-hopeite, Zn3(PO4)2·4H2O in dilute phosphoric acid solutions has been determined at 25°C as a function of pH. Interpretation of the data in terms of a model which assumes the formation of the ion-pairs ZnHPO40 and ZnH2PO4+ in these solutions resulted in the solubility product constant for α-hopeite of 10?35.3±0.1. The data show that the formation of hopeite may influence both the availability of zinc in soils and the zinc levels in natural water systems. |
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