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Kobayashi, Taishi*; Sasaki, Takayuki*; Kitamura, Akira
Journal of Chemical Thermodynamics, 138, p.151 - 158, 2019/11
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) range of 613 and at total ISA concentration ([ISA]) = 1010 mol/dm. The dependence of U(IV) solubility on pH and [ISA] suggested the existence of U(OH)(ISA) as a dominant species within the investigated pH range of 612. For the U(VI)-ISA system, UO(OH)(ISA) was suggested as a dominant species at pH 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.
Kitamura, Akira
JAEA-Data/Code 2018-018, 103 Pages, 2019/03
The latest available thermodynamic data were critically reviewed and the selected values were included into the JAEA-TDB for performance assessment of geological disposal of high-level radioactive and TRU wastes. This critical review specifically addressed thermodynamic data for (1) a zirconium-hydroxide system through comparison of thermodynamic data selected by the Nuclear Energy Agency within the Organisation for Economic Co-operation and Development (OECD/NEA), (2) complexation of metal ions with isosaccharinic acid based on the latest review papers. Furthermore, the author performed (3) tentative selection of thermodynamic data on ternary complexes among alkaline-earth metal, uranyl and carbonate ions, and (4) integration with the latest version of JAEA's thermodynamic database for geochemical calculations. The internal consistency of the selected data was checked by the author. Text files of the updated and integrated thermodynamic database have been prepared for geochemical calculation programs of PHREEQC and Geochemist's Workbench.
G.Meinrath*; ; Kimura, Takaumi; Yoshida, Zenko
Radiochimica Acta, 75(3), p.159 - 167, 1996/00
no abstracts in English
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Journal of Nuclear Science and Technology, 15(9), p.685 - 689, 1978/09
no abstracts in English
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Journal of Nuclear Science and Technology, 15(2), p.141 - 144, 1978/02
Times Cited Count:3no abstracts in English
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Radiochem.Radioanal.Lett., 29(6), p.331 - 340, 1977/06
no abstracts in English
; ; ;
Journal of Nuclear Science and Technology, 4(9), p.482 - 487, 1967/00
Times Cited Count:0no abstracts in English
Suzuki, Shinichi; Kobayashi, Toru; Shiwaku, Hideaki; Yaita, Tsuyoshi
no journal, ,