Thermodynamic studies on the solubility of actinides in the presence of organic acids related to geological disposal

Kobayashi, Taishi*; Teshima, Takeshi*; Wang, P.*; Sasaki, Takayuki*; Kitamura, Akira

We focused on the complexation of U(IV) and U(VI) with isosaccharinic acid (ISA) and measured U(IV) and U(VI) solubility in the presence of ISA. The solubility dependences on hydrogen ion concentration (pHc) and ISA concentration revealed the dominant U(IV) and U(VI) ISA complexes and determined their formation constants. Furthermore, the solubility of Zr(IV), as an analogous of An(IV), in the presence of organic acids with different number of hydroxyl groups were investigated to elucidate the strong complexation ability of ISA.

Language	:	English
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Meeting title	:	17th International Conference on the Chemistry and Migration Behavior of Actinides and Fission Products in the Geosphere (Migration 2019)
Held date	:	2019/09
Location (city)	:	Uji
Location (country)	:	Japan
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Keywords	:	Solubility; Uranium; Zirconium; Isosaccharinic Acid; Complexation; Geological Disposal
Research Facility	:	ENTRY(地層処分基盤研究施設)
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Article of JAEA R&D Review	:
Cooperating Institute	:	京都大学

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Registration No. : BB20181905
JAEA Abstracts No. :
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