The selectivity of a macroreticular styrene-divinylbenzene copolymer-based methylenephosphonic acid resin (RCSP) toward 17 kinds of metal ions was evaluated in nitric acid media by means of distribution ratio measurements; the order of decreasing affinity was found to be Fe(III) ∼ U(VI) ∼ Mo(VI) > Bi(III) > Al(III) > Gd(III) > La(III) ∼ V(V) > Pb(II) > Cd(II) > Cu(II) ∼ Ca(II) ∼ Ba(II) ∼ Zn(II) > Mg(II) ∼ Co(II) ∼ Ni(II). Among the tested metal ions, Fe(III), Mo(VI), and U(VI) were highly distributed into RCSP even from 6 M nitric acid as in the case of solvent extraction with organophosphorous acids and esters. However, RCSP did not exhibit as high an affinity with these metal ions in 6 M hydrochloric acid.
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Jyo et al. (1997) studied this question.
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