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Solubility and Volatility of MoO3 in High-Temperature Aqueous Solutions

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Advances in Experimental and Genetic Mineralogy

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Abstract

The thermodynamic properties of the neutral molybdic acid H2MoO4 are evaluated at 273–623 K and the saturated water vapor pressure from our own solubility data at 563–623 K and literature results at lower temperatures. Combining the Gibbs energies of H2MoO4 in the state of the aqueous solution with those in the ideal gas state, we calculated Henry’s constants and the vapor–liquid distribution constants of H2MoO4 at 273–623 K, and with the use of the relevant asymptotic relations, extrapolated values of Henry’s constants, \(k_{\text{H}}\), and vapor–liquid distribution constants, \(K_{\text{D}}\), toward the critical point of pure water. Our results show that over the whole temperature range of the existence of the vapor–liquid equilibrium of water, the neutral molybdic acid H2MoO4 is somewhat less volatile compared with Si(OH)4, and the difference in volatility of these species decreases with the temperature.

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Acknowledgements

This research was partially supported by the Russian Foundation for Basic Research (Grant # 15-05-2255). The authors thank A. N. Nekrasov and T. N. Dokina (IEM RAS) for SEM and XRD measurements and Dr. V. K. Karandashev (IPTM RAS) for ICP-MS analyses.

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Authors and Affiliations

  1. D.S. Korzhinskii Institute of Experimental Mineralogy, Russian Academy of Sciences, Academician Osipyan Street 4, Chernogolovka, Moscow Region, Russia, 142432

    A. V. Plyasunov, T. P. Dadze, G. A. Kashirtseva & M. P. Novikov

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  1. A. V. Plyasunov
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  2. T. P. Dadze
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  3. G. A. Kashirtseva
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  4. M. P. Novikov
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Correspondence to A. V. Plyasunov .

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Editors and Affiliations

  1. Mantle Laboratory, DS Korzhinskii Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, Moscow Oblast, Russia

    Yuriy Litvin

  2. Metamorphism Laboratory, DS Korzhinskii Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, Moscow Oblast, Russia

    Oleg Safonov

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Plyasunov, A.V., Dadze, T.P., Kashirtseva, G.A., Novikov, M.P. (2020). Solubility and Volatility of MoO3 in High-Temperature Aqueous Solutions. In: Litvin, Y., Safonov, O. (eds) Advances in Experimental and Genetic Mineralogy. Springer Mineralogy. Springer, Cham. https://doi.org/10.1007/978-3-030-42859-4_6

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