NpO2＋与UO22＋阳阳离子络合对Np（Ⅵ）/Np（Ⅴ）表观电位及可逆性的影响

通过分光光度法考察了阳阳离子络合物的形成,并研究了不同酸度和不同U（Ⅵ）浓度对Np（Ⅵ）/Np（Ⅴ）表观电位及其可逆性的影响.结果表明：溶液中U（Ⅵ）的存在会影响Np（Ⅵ）/Np（Ⅴ）的表观电位;随着U浓度的不断升高,Np（Ⅵ）/Np（Ⅴ）表观电位不断升高,同时该氧化还原反应的可逆性逐渐变差;随着溶液中酸度的提高,Np（Ⅵ）/Np（Ⅴ）表观电位不断降低....

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Published in核化学与放射化学 Vol. 36; no. 1; pp. 34 - 38
Main Author 李晓东 鲜亮 郑卫芳 晏太红 谢书宝
Format Journal Article
LanguageChinese
Published 2014
Subjects
可逆性
表观电位
镎
阳阳离子络合
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Summary:通过分光光度法考察了阳阳离子络合物的形成,并研究了不同酸度和不同U（Ⅵ）浓度对Np（Ⅵ）/Np（Ⅴ）表观电位及其可逆性的影响.结果表明：溶液中U（Ⅵ）的存在会影响Np（Ⅵ）/Np（Ⅴ）的表观电位;随着U浓度的不断升高,Np（Ⅵ）/Np（Ⅴ）表观电位不断升高,同时该氧化还原反应的可逆性逐渐变差;随着溶液中酸度的提高,Np（Ⅵ）/Np（Ⅴ）表观电位不断降低.
Bibliography:LI Xiao-dong, XIAN Liang , ZHENG Wei-fang, YAN Tai-hong, XIE Shu-bao China Institute of Atomic Energy, P. O. Box 275（26）, Beijing 102413, China
The formation of cation-cation complex between Np（ V ） and U（VI） in the aqueous solution of nitric acid has been studied by spectrophotornetry. The influence of U （VI） concentration on the redox potential of Np（VI）/Np（ V ） couple in nitric acid media has been also researched. The results show that the presence of U（VI） influences the redox potential of Np（VI ）/Np（ V ） couple. With an increase in the U（ VI ） concentration, the redox potential of Np（VI）/Np（ V ） is increased and the redox reaction becomes irreversible. It is also found that the redox potential can be reduced by increasing the HN03 concentration.
cation-cation complex; redox potential; neptunium; reversibility
11-2045/TL
ISSN:0253-9950