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The SIT Model Parameters for Interactions of Uranyl Ion with Chloride and Nitrate Ions

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Abstract

The SIT model for activity coefficients of aqueous ions is popular among radiochemists. So far, this model has no parameters for interactions between uranyl ion and the chloride and nitrate anions, as their evaluation from activity coefficients of uranyl chloride and nitrate could not be recommended due to partial association of these electrolytes. This study discusses the relations of the thermodynamics of associated electrolytes that allows correction of the activity coefficients for effects of complex formation and thus determine the “true” values of the SIT interaction coefficients. At 298 K the following values are obtained: \(\epsilon \left(\text{UO}_{\text{2}}^{\text{2+}},\text{CI}^{{-}}\right)\) = (0.32 ± 0.03); \(\epsilon \left(\text{UO}_{2}\text{C}{\text{l}}^{+},\text{Cl}^{{-}}\right)\) = (0.32 ± 0.02); \(\epsilon \left(\text{UO}_{\text{2}}^{\text{2+}},\text{NO}_{3}^{-}\right)\) = (0.28 ± 0.02); \(\epsilon \left(\text{UO}_{2}\text{N}{\text{O}}_{3}^{+},\text{NO}_{3}^{-}\right)\) = (0.34 ± 0.02).

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Acknowledgements

The author wishes to dedicate this work to the memory of the late Prof. Ingmar Grenthe (KTH, Stockholm, Sweden), with whom the author collaborated in 1992–1995 and in 2015–2020 years. This work was performed in the frame of the Thermochemical Database Project (TDB) of the OECD Nuclear Energy Agency (NEA), with additional support provided by the Ministry of Science and Higher Education of the Russian Federation, project No. FMUF-2022-0003, registration No. 1021051201959-6-1.5.6;1.5.4;1.5.2.

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  1. Institute of Experimental Mineralogy, Russian Academy of Sciences, 142432, Chernogolovka, Russia

    Andrey V. Plyasunov

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Plyasunov, A.V. The SIT Model Parameters for Interactions of Uranyl Ion with Chloride and Nitrate Ions. J Solution Chem 52, 3–18 (2023). https://doi.org/10.1007/s10953-022-01213-8

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