Optical Absorption, Stability and Structure of NpO(2)+ Complexes with Dicarboxylic Acids.

Tian, G. ; Rao, L.

Technical Information Center Oak Ridge Tennessee

关键词: Absorption;    Dicarboxylic acids;    Cations;    Actinides;    Spent fuels;   

RP-ID  :  DE2006862345

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

The dioxoactinide(V) and (VI), or actinyl, cations of U, Np, Pu, and Am are of importance because of their unique properties and behavior in the reprocessing of nuclear spent fuel and in the migration of actinide elements. These actinyl cations are hard Lewis acids, like the tri- and tetravalent f-element ions, primarily tend to form ionic bonds, and prefer oxygen donor ligands to softer ligands containing nitrogen and sulfur donor atom. Especially, the pentavalent actinyl cations with the lowest charge density of the actinide ions have very low tendency to form strong complexes with ligands, even with hard bases. Consequently, the pentavalent actinyl cations are very different to be separated from high-level nuclear waste by using traditional extractants, and they are highly mobile in the subsurface, raising concern about the migration of these radionuclides in the environment.