Abstract
In systematic studies of actinide chemistry in alkaline solution, it was found that Pu(IV) hydrous oxide can remove significant amounts of plutonium present in higher oxidation states from solution. By spectrophotometry it was found that the capture of Pu(VI) by Pu(IV) hydrous oxide is negligible whereas Pu(V) and Np(V) are highly adsorbed. Quantitative characterization of the process was investigated by a radiometric method based on 239Np-labeled neptunium. The influence of temperature, alkali concentration, and the Pu/Np molar ratio on the extent of capture of Np(V) by PuO 2 xH 2O was investigated.
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