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meltNagai, Takayuki; Okamoto, Yoshihiro; Inose, Takehiko*; Akiyama, Daisuke*; Sato, Nobuaki*
no journal, ,
A supplied high level liquid waste into the glass melter is formed to the mixed nitrate salt after the dehydration. In this study, NaNO which is a main ingredient in the waste was selected by the solvent, and NaNO sample including Ru was prepared, and the redox behavior of Ru in NaNO melt was measured by the Cyclic Voltammetry. And valence of Ru included in solidified salt was estimated by the synchrotron XAFS measurement.
Ouchi, Kazuki; Kitatsuji, Yoshihiro; Otobe, Haruyoshi; Kihara, Sorin*
no journal, ,
In this study, we investigated the change of the deposition amount on standing to obtain knowledge of the chemical state change of electrodeposited U(IV). After electrolysis was stopped, the U deposits on the electrode surface decreased regardless of the presence or absence of U(VI) ion. When the oxidation potential (+0.2 V) was applied, the decrease of the deposits was faster than that of stopping electrolysis. On the other hand, when the reduction potential (-0.35 V) was applied, the decrease of the deposits was not observed. The decrease rate of deposits applied oxidation potential was very fast soon after the start of electrolysis and turned to be slow subsequently. This suggests that U deposition species transform into U oxide having more stable state electrochemically.