Abstract
ABSTRACT The extraction of thorium(IV) and uranium(VI) from nitric acid solutions into ligroine solutions of 2-ethylhexyl phenylphosphonic acid (HEHφP), micellar dinonyl naphthalene sulphonic acid (HDNNS) extractants and mixture of the two extractants is reported. A synergistic enhancement factor of 66.9 and 10.8 were observed for Th and U, respectively, when extracted from 1 M HNO3 Although HDNNS shows better separation of thorium and uranium, the mixed ligand system exhibits superior extractability for both metals ions. Slope analysis method was used to establish the extraction stoichiometry. The extraction stoichiometry varies as the concentration of the micellar HDNNS in the organic phase and the acidity of the aqueous phase changes.
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