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

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

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.

Language	:	English
Journal	:	Journal of Chemical Thermodynamics
Volume	:	138
Number	:
Pages	:	p.151 - 158
Publication Year/Month	:	2019/11
Meeting title	:
Held date	:
Location (city)	:
Location (country)	:
Patent information	:
PDF	:
Paper URL	:	https://doi.org/10.1016/j.jct.2019.06.006
DOI for research data	:
Keywords	:	uranium(IV); uranium(VI); solubility; isosaccharinate; complex formation
Research Facility	:	ENTRY(地層処分基盤研究施設)
Press Release	:
Article of JAEA R&D Review	:
Cooperating Institute	:	京都大学

Accesses	:	- Accesses
Web of Science® Times Cited Count	:	Times Cited Count： If you would like to get the latest times cited, please access the Web of Science®. http://www.webofknowledge.com/wos
InCites™	:	Percentile:14.74 Category:Thermodynamics
Altmetrics	:

Registration No. : AA20190092
JAEA Abstracts No. : 47001399
Paper Submission No. : 22024

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.