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高塩濃度下における4価テクネチウム溶解度

Solubility of technetium(IV) in NaNO$$_{3}$$ solutions

小林 大志*; 佐々木 隆之*; 北村 暁  

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

硝酸塩がテクネチウム($$^{99}$$Tc)の酸化還元挙動に及ぼす影響を明らかにするため、Eh緩衝剤を添加した硝酸ナトリウム(NaNO$$_{3}$$)水溶液に4価テクネチウム水酸化物固相を添加し、溶解反応を検討した。濃NaNO$$_{3}$$条件下では溶存Tc濃度が増加し、その傾向はEh緩衝剤により制御された酸化還元電位により概ね解釈できることが分かった。

Solubility of amorphous technetium(IV) hydroxide was investigated using redox buffers to control various redox potentials in NaNO$$_{3}$$ media. Aqueous technetium concentration increased with increasing NaNO$$_{3}$$ concentration. It was found that the obtained aqueous technetium concentration was well interpreted by thermodynamic calculations using the obtained redox potentials.

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