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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.

Oral presentation

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

no journal, , 

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.

Oral presentation

Solubility of palladium and tin in the presence of $$alpha$$-isosaccharinic acid

Kitamura, Akira; Sekioka, Yasushi*

no journal, , 

Solubility of palladium and tin has been experimentally investigated in the presence of $$alpha$$-isosaccharinic acid (ISA). The obtained solubility increased with increasing concentration of ISA, especially for palladium.

Oral presentation

Solubility of palladium in the presence of $$alpha$$-isosaccharinic acid

Miyabe, Shunsuke*; Maeno, Mamiko*; Matsubara, Kazuhito*; Tomiyasu, Kaoru*; Ogami, Chiari*; Kitamura, Akira; Kimuro, Shingo

no journal, , 

The effect of $$alpha$$-isosaccharinic acid (ISA) on solubility of palladium (Pd) was investigated under alkaline pH conditions. Increase in palladium solubility was observed with increasing ISA concentration at pH values around 8.5 and 10.0.

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