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

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

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.

Language	:	English
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Meeting title	:	ACTINIDES 2017
Held date	:	2017/07
Location (city)	:	Sendai
Location (country)	:	Japan
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Keywords	:	Solubility; uranium(IV); isosaccharinic acid; thermodynamic data; TRU waste disposal
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Article of JAEA R&D Review	:
Cooperating Institute	:	京都大学

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Registration No. : BB20162151
JAEA Abstracts No. :
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