A Valence Control Method Based on a Pt-Aided Hydrogen Peroxide Treatment for Yielding Tetravalent Neptunium and Plutonium in Nitrie Acid Solutions

摘要

There are several possible causes of the recovery decrease sometimes encountered in the chemical separation procedures for actinides. Although the interferences present in the samples could be related to the recovery decrease in the actinide separations, an incomplete valence control of the actinides in the sample solution conditioning step often causes problems of a significant loss of them in the subsequent sample loading step. Thus, control of the valence states of the actinides in the sample solutions is a basis for the separation methods such as anion exchange, extraction chromatography, solvent extraction and precipitation.