Electrochemical Studies on Uranium in the Presence of Organic Acids
Electrochemical Studies on Uranium in the Presence of Organic Acids
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DOI：
10.1080/18811248.2007.9711366
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发表时间：
2007-09
影响因子：
1.2
通讯作者：
Yoshinori Suzuki;T. Nankawa;T. Ozaki;T. Ohnuki;A. Francis;Y. Enokida;I. Yamamoto
中科院分区：
文献类型：
--
作者：
Yoshinori Suzuki;T. Nankawa;T. Ozaki;T. Ohnuki;A. Francis;Y. Enokida;I. Yamamoto
我们研究了UO 2 2+在高氯酸盐和有机酸（草酸、丙二酸、丁二酸、己二酸、L-苹果酸和L-酒石酸）溶液中的电化学氧化还原反应，用循环伏安法揭示了与有机酸形成络合物对氧化还原行为的影响。在高氯酸和有机酸溶液中，观察到UO 2 2+/UO 2+的氧化还原反应和UO 2+还原生成的U（IV）的氧化反应。UO 2 2+还原峰电位与1：1 UO 2 2+-有机络合物的稳定常数呈良好的线性关系。在丙二酸存在下，UO 2 2+/UO 2+的氧化还原电位在pH 1-2和5-6范围内保持恒定，而在pH 2 ~ 5范围内随pH的升高而降低。此外，在0.1-0.5 M浓度下，它与丙二酸盐浓度无关，而在0.005 - 0.1 M浓度范围内，它随浓度增加而降低。根据实验结果和形态计算结果，我们确定了UO 2 2+-丙二酸盐配合物的氧化还原反应作为pH和丙二酸盐浓度的函数。用同样的方法测定了UO_2 ~（2+）-草酸盐配合物的氧化还原反应。
We examined electrochemical redox reactions of UO2 2+ in perchlorate and organic acid (oxalic, malonic, succinic, adipic, L-malic, and L-tartaric acids) solutions using cyclic voltammetry to reveal the effects of complex formation with organic acids on the redox behavior. In the perchlorate and organic acid solutions, a redox reaction of UO2 2+/UO2 + and an oxidation reaction of U(IV) produced by a disproportionation of UO2 + were observed. The peak potentials of the UO2 2+ reduction showed a good linear relationship with the stability constants of 1:1 UO2 2+-organic complexes. In the presence of malonic acid, the redox potential for UO2 2+/UO2 + was constant at pH 1-2 and 5-6 while it decreased with an increase in pH from 2 to 5. Additionally, it was independent of malonate concentration at 0.1–0.5 M while it decreased with an increase in the concentration from 0.005 to 0.1 M. Based on the experimental and the speciation calculation results, we determined the redox reactions of UO2 2+-malonate complexes as a function of pH and malonate concentration. We also determined the redox reactions of UO2 2+-oxalate complexes in the same way.