Effects of ligands on the solubility of tin

Oda, Chie ; not registered

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.

Language	:	English
Report No.	:	JNC TN8400 98-001
Pages	:	14 Pages
Publication Year/Month	:	1998/11
Patent information	:
PDF	:	JNC-TN8400-98-001.pdf:0.38MB
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Keywords	:	126Sn; Cl‐; Na‐ClO4‐Cl‐SO4水溶液系; Na‐ClO4系; OH‐; pH; pH依存性; Sn(IV); SnO2(am); SnO2・xH2O; SO4(2‐); すず; すず化合物; すず酸; すず酸化物(IV); ベントナイト; ベントナイト平衡液; 塩化物錯体; 加水分解; 加水分解定数; 高レベル廃棄物; 高レベル放射性廃棄物; 錯体; 水溶液; 性能評価; 地下空洞; 地層研究; 地中処分; 熱力学データ; 熱力学的性質; 濃度; 濃度変化; 配位子; 配位子濃度; 非晶質; 放射性廃棄物; 埋設; 溶解度; 溶解度評価; 硫酸塩錯体
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Registration No. : GJ0819980090
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