ESTIMATING ACTIVITY AND OSMOTIC COEFFICIENTS IN UO2(NO3)2- HNO3- NaNO3MIXTURES
- 1 January 1988
- journal article
- research article
- Published by Informa UK Limited in Solvent Extraction and Ion Exchange
- Vol. 6 (4), 675-697
- https://doi.org/10.1080/07366298808917960
Abstract
The Pitzer treatment is employed to estimate activity and osmotic coefficients for these aqueous mixtures from literature data. A convenient formalism is presented for the inclusion of electrically neutral species such as undissociated HNO3 in the treatment. The water vapor pressure and the solubility of uranyl nitrate hexahydrate in HNO3 could be fitted reasonably well with parameters derived from solutions of the separate components. Isopiestic data for NaNO3 - UO2 (NO3) 2 mixtures required one mixture parameter. Stoichiometric activity coefficients and water activities are generated for UO2 (NO3)2 - HNO3 mixtures from the derived parameters.Keywords
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