Adsorptivity of silica-supported monoamide resins to U(IV) in nitric acid media

For the selective extraction of radionuclides from nitrate media, the extraction properties of organopolyphosphine polyoxides were examined in the form of impregnated adsorbents. It was found that the extraction property of 1,1,3,5,5-pentaphenyl-1,3,5-triphosphapentane trioxide (PPTPT) for U(VI) is quite unusual with very high values of the distribution ratio in nitric acid solutions of both low and high concentration ranges, which is not observed for other types of extractants. From the extraction properties for other metal ions, this type of extracant may be promising for the selective extraction of U(VI) from HNO₃ of very low and high concentrations.