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Radiochimica Acta

International Journal for chemical aspects of nuclear science and technology

Ed. by Qaim, Syed M.

12 Issues per year

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Volume 102, Issue 8 (Aug 2014)


Thermodynamic model for the solubility of Ba(SeO4, SO4) precipitates

Dhanpat Rai / Andrew R. Felmy / Dean A. Moore / Akira Kitamura / Hideki Yoshikawa / Reisuke Doi / Yasushi Yoshida
Published Online: 2014-04-14 | DOI: https://doi.org/10.1515/ract-2013-2207


The solubility of Ba(SeO4, SO4) precipitates was determined as a function of the BaSeO4 mole fractions, ranging from 0.0015 to 0.3830, and time with an equilibration period extending to as long as 302 days. Equilibrium/steady state conditions in this system are reached in ≤ 65 days. Pitzer's ion interaction model was used to calculate solid and aqueous phase activity coefficients. Thermodynamic analyses showed that the data do not satisfy Gibbs-Duhem equation, thereby demonstrating that a single-solid solution phase does not control both the selenate and sulfate concentrations. Our extensive data with log 10 [Ba] ranging from − 3.6 to −5.9 mol kg1, log 10 [SeO4] ranging from − 3.6 to −5.2 mol kg1, and log 10 [SO4] ranging from − 4.0 to −5.3 mol kg1 can be explained with the formation of an ideal BaSeO4 solid solution phase that controls the selenium concentrations and a slightly disordered/less-crystalline BaSO4(s) (log 10 Ksp =− 9.5 instead of − 10.05 for barite) that controls the sulfate concentrations. In these experiments the BaSO4 component of the solid solution phase never reaches thermodynamic equilibrium with the aqueous phase. Thermodynamic interpretations of the data show that both the ideal BaSeO4 solid solution phase and less-crystalline BaSO4(s) phase are in equilibrium with each other in the entire range of BaSeO4 mole fractions investigated in this study.

Keywords: Solubility; Solid solution; Selenium; Barium; Sulfate; Solubility product

About the article

Accepted: 2014-02-19

Received: 2013-10-22

Published Online: 2014-04-14

Published in Print: 2014-08-28

Citation Information: Radiochimica Acta, ISSN (Online) 2193-3405, ISSN (Print) 0033-8230, DOI: https://doi.org/10.1515/ract-2013-2207.

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©2014 Walter de Gruyter Berlin/Boston. Copyright Clearance Center

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