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JAEA Reports

Effects of ligands on the solubility of tin

Oda, Chie; *

JNC TN8400 98-001, 14 Pages, 1998/11

JNC-TN8400-98-001.pdf:0.38MB

Solubilities of amorphous stannic oxide, SnO $_{2}$ (am) in Na-ClO $_{4}$ -Cl-SO $_{4}$ aqueous systems were measured to quantitatively investigate the influences of the ligands OH $^{-}$ , Cl $^{-}$ and SO $_{4}^{2-}$ on solubilities. They were also measured in bentonite equilibrated solutions to discuss the behavior of tin under a repository condition of a high-revel radioactive waste. The solubility data in sodium perchlorate media in the range of pH from 6 to 11 showed pH dependency, and the hydrolysis constants of tin (IV) were determined (Amaya, et al., 1997). No significant changes in solubilities with the variation in Cl $^{-}$ , SO $_{4}^{2-}$ concentrations were observed in Na-ClO $_{4}$ -Cl-SO $_{4}$ aqueous systems, so this indicates that chloride and sulfate species were less effective than hydroxide complexes. On the other hand, solubilities in bentonite equilibrated solutions were higher than solubilities of other experiments in simple systems. These results suggest that (1) other complexes of tin except hydroxide, chloride or sulfate complexes of tin (IV) may dominantly exist in aqueous phase, (2)solid phase other than SnO $_{2}$ (am) may limit the solubility of tin under repository conditions.

Oral presentation

Reaction modeling of ion-pairing extraction of various meatal ions with NTAamide(C6) extractant from hydrochloric acid solution

Kinoshita, Ryoma; Sasaki, Yuji; Kaneko, Masashi; Matsumiya, Masahiko*; Shinoku, Kota*; Shiroishi, Hidenobu*

no journal, ,

Many metal ions are stable in hydrochloric acid solutions as anionic species; diamidic-extractants containing tertiary amino nitrogen atom, such as NTAamide (hexaalkyl-nitrilotriacetamide), are normally protonated in acidic solutions and become cationic extractants. In this study, the ion-pair extraction reactions of metal chloride anions with cationic NTAamide(C6) extractant were investigated. In addition, we attempted to predict the distribution ratio by combining the stability constants of metal chloride complexes and DFT calculations, and compared the results with experimental values.