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The solubility of CaMoO4(c) and an aqueous thermodynamic model for Ca2+-MoO 24 -ion-interactions

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Abstract

The solubility of powellite [CaMoO4(c)] was studied in aqueous Na2MoO4, CaCl2 and Ca(NO3)2 solutions ranging in concentrations from 1×10−4M to 1.0M and over equilibration times extending to 36 days. Our experimental data were interpreted using the aqueous ion-interaction model of Pitzer and coworkers. The Ca2+−MoO 2−4 ion-interactions were found to be analogous to Ca2+−SO 2−4 . The use of Ca2+−MoO 2−4 ion-interactions parameters (β(0)=0.2, β(1) = 3.1973 and β(2)) and a logK sp of −7.93 gave excellent predictions of all of the experimental data. Commonion ternary interaction parameters such as MoO 2−4 −Cl− or MoO 2−4 −NO −3 were not required.

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Authors and Affiliations

  1. Battelle, Pacific Northwest Laboratories, 99352, Richland, WA

    Andrew R. Felmy, Dhanpat Rai & Marvin J. Mason

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  1. Andrew R. Felmy
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  2. Dhanpat Rai
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  3. Marvin J. Mason
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Felmy, A.R., Rai, D. & Mason, M.J. The solubility of CaMoO4(c) and an aqueous thermodynamic model for Ca2+-MoO 24 -ion-interactions. J Solution Chem 21, 525–532 (1992). https://doi.org/10.1007/BF00649561

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  • DOI: https://doi.org/10.1007/BF00649561

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