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Journal Articles

Thermodynamic interpretation of uranium(IV/VI) solubility in the presence of -isosaccharinic acid

Kobayashi, Taishi*; Sasaki, Takayuki*; Kitamura, Akira

Journal of Chemical Thermodynamics, 138, p.151 - 158, 2019/11

https://doi.org/10.1016/j.jct.2019.06.006

Times Cited Count：3 Percentile：14.74(Thermodynamics)

The effect of -isosaccharinic acid (ISA) on the solubility and redox of tetravalent and hexavalent uranium (U(IV), U(VI)) was investigated in the hydrogen ion concentration (pH $_{c}$ ) range of 613 and at total ISA concentration ([ISA] $_{rm tot}$ ) = 10 $^{-4}$ 10 $^{-1.2}$ mol/dm $^{3}$ . The dependence of U(IV) solubility on pH $_{c}$ and [ISA] $_{rm tot}$ suggested the existence of U(OH) $_{4}$ (ISA) $_{2}$ $^{2-}$ as a dominant species within the investigated pH $_{c}$ range of 612. For the U(VI)-ISA system, UO $_{2}$ (OH) $_{3}$ (ISA) $_{2}$ $^{2-}$ was suggested as a dominant species at pH $_{c}$ 713. The formation constants of the U(IV)-ISA and U(VI)-ISA complexes were determined by least-squares fitting of the solubility data. The solubility of U(IV) and U(VI) in the presence of ISA and its effect on the redox behavior were thermodynamically interpreted based on the obtained constants.