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

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...

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Bibliographic Details
Published in:Journal of solution chemistry 2023, Vol.52 (1), p.3-18
Main Author: Plyasunov, Andrey V.
Format: Article
Language:English
Subjects:
Activity coefficients
Chemistry
Chemistry and Materials Science
Chlorides
Complex formation
Condensed Matter Physics
Electrolytes
Geochemistry
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Mathematical models
Oceanography
Parameters
Physical Chemistry
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Summary: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: ϵ UO 2 2+ , CI - = (0.32 ± 0.03); ϵ UO 2 Cl + , Cl - = (0.32 ± 0.02); ϵ UO 2 2+ , NO 3 - = (0.28 ± 0.02); ϵ UO 2 NO 3 + , NO 3 - = (0.34 ± 0.02).
ISSN:0095-9782
1572-8927
DOI:10.1007/s10953-022-01213-8