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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：14.19(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.

Journal Articles

Extraction-spectrophotometric determination of uranium(III) with chlorophosphonazo-III

Analytica Chimica Acta, 65(2), p.329 - 334, 1973/02

https://doi.org/10.1016/S0003-2670(01)82499-5

Times Cited Count：19

no abstracts in English

Oral presentation

Thermodynamic study on the complexation of U(IV) with isosaccharinic acid

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

no journal, ,

The solubility of U(OH) $_{4}$ (am) was investigated in the presence of isosaccharinic acid (ISA) as a function of hydrogen ion concentration (pHc) and ISA concentration. The solubility in neutral pH region was independent of pHc, while those in alkaline pH region slightly increased with increasing pHc. The solubility was investigated as a function of ISA concentration and found to increase with a slope of approximately 2 with increasing ISA concentration. It was therefore suggested that U(OH) $_{4}$ (ISA) $_{2}$ $^{2-}$ and U(OH) $_{5}$ (ISA) $_{2}$ $^{3-}$ were the dominant U(IV)-ISA complexes, which were similar to those observed in Zr(IV)-ISA system. Complex formation constants were determined by the least square fitting analysis of the solubility data and the calculated solubility curve well reproduced the experimental data.