Identification of plural chemical species of Y, Eu and actinides in a synergistic extraction system of diamides and 2-thenoyltrifluoroacetone

Chemical species of Y, Eu and actinides were extracted synergically into an organic solvent with 2-thenoyltrifluoroacetone (Htta) and N,N'-dimethyl-N,N'-dihexyl-3-oxapentanediamide (DMDHOPDA) or with N,N'-dimethyl-N,N'-dihexyl-3-thiapentanediamide (DMDHTPDA) and then investigated by an analysis of the distribution ratio of metal ions. Upon certain concentrations of extractants (0.748 mM [DMDHOPDA] + 5 mM [Htta] in toluene for Y, Cm and Cf, and 2.8 mM [DMDHOPDA] + 0.5 mM [Htta] in toluene for U), it was found that log D had a curvilineal relationship with the pH. Using the results of the relations of log [Htta] vs, log D and log [DMDHOPDA] vs. log D, a slope analysis showed that more than two extraction species existed, i.e., M(DA)(2)(tta)(X)(2), M(DA)(tta)(2)(X), where M is Cm or Cf, DA is DMDT-TOPDA, and X- is ClO4-. Tn the extraction system of DMDHTPDA and Htta, it was confirmed that plural extraction species of Eu, Am, Th and U also existed in the organic solvent of nitrobenzene.