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首页> 外文期刊>World Journal of Nuclear Science and Technology >Valence Stabilization of Polyvalent Uranium Ions in Presence of Some Organic Additives during Extended Gamma Irradiation of Their Aqueous Acidic Solutions
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Valence Stabilization of Polyvalent Uranium Ions in Presence of Some Organic Additives during Extended Gamma Irradiation of Their Aqueous Acidic Solutions

机译：在酸性水溶液的扩展γ辐照下，某些有机添加剂存在下多价铀离子的价稳定化

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In gamma irradiated aqueous acidic uranium solutions, tetravalent uranium ions are easily oxidized while U(VI) ions remain unchanged. In general, valence change of polyvalent metallic ions during chemical reprocessing of spent nuclear fuel solutions can lead to undesirable effects under the influence of the existing gamma radiations. Consequently, studies on valence stabilization of Uranium ions during chemical treatment in strong gamma irradiation fields seem to be highly interesting. It has been reported before that some organic compounds proved to be effective in stabilizing the valence of Fe(II) ions during extended gamma irradiation of their acidic solutions. In the present work, valence stabilization of Uranium ions in acidic solutions in presence of different classes of organic compounds has been studied. The results showed that in case of U(IV), methanol or formic acid are capable of providing about 80% protection while ethanol or acetaldehyde can provide about 70% protection. Propanol has the least protective effect i.e. about 54%. On using U(VI) instead of U(IV) in the irradiated solutions, the uranium ions were reduced and the formed U(IV) was protected as follows: formic acid or methanol can provide 69% or 63% protection respectively while ethanol, acetaldehyde or propanol can provide 50%, 35% and 24% respectively. In any case, protection exists as long as the organic additives were not completely consumed.
机译：在γ射线辐照的酸性铀水溶液中，四价铀离子很容易被氧化，而U（VI）离子保持不变。通常，在乏核燃料溶液的化学后处理过程中，多价金属离子的化合价变化会在现有伽马射线的影响下导致不良影响。因此，在强伽马辐照场中化学处理过程中铀离子的价态稳定化研究似乎非常有趣。以前已经报道过，某些有机化合物被证明可有效地在其酸性溶液的长时间γ射线照射期间稳定Fe（II）离子的化合价。在目前的工作中，已经研究了在存在不同种类的有机化合物的情况下，在酸性溶液中铀离子的价态稳定作用。结果表明，在U（IV）的情况下，甲醇或甲酸可以提供约80％的保护，而乙醇或乙醛可以提供约70％的保护。丙醇具有最小的保护作用，即约54％。在辐照溶液中使用U（VI）代替U（IV）时，铀离子被还原，形成的U（IV）受到如下保护：甲酸或甲醇分别提供69％或63％的保护，而乙醇，乙醛或丙醇可分别提供50％，35％和24％。在任何情况下，只要有机添加剂没有被完全消耗，就存在保护。

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