NpO_2^+与UO_2^(2+)阳阳离子络合对Np(Ⅵ)/Np(Ⅴ)表观电位及可逆性的影响  

Influence of Cation-Cation Complexation Between NpO_2^+and UO_2^(2+) on Redox Potential of Np(Ⅵ)/Np(Ⅴ)

作　　者：李晓东[1] 鲜亮[1] 郑卫芳[1] 晏太红[1] 谢书宝[1] 

机构地区：[1]中国原子能科学研究院,北京102413

出　　处：《核化学与放射化学》2014年第1期34-38,共5页Journal of Nuclear and Radiochemistry

摘　　要：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。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.

关 键 词：阳阳离子络合 表观电位 镎 可逆性 

分 类 号：TL241[核科学技术—核燃料循环与材料] O646.54[理学—物理化学]