477-480Thorium(IV) has been separated by reversed phase extraction chromatographic technique with n-capric acid (a high molecular weight carboxylic acid) as stationary phase on a column of silica gel with acetate buffer (pH 4.0-5.0) as the mobile phase. The exchangecapacity ofthe exchanger has been reported. Thorium(lV) has been separated from binary and multicomponent mixtures of severalions, e.g., Mg(ll), Cr(lll), Mn(II), Fe(III), Co(II), Ni(II), Zn(ll), Cd(II), Hg(II), Pb(II), Bi(III), La(III), Ce(lV), Pr(III), Nd(III), Sm(III), Zr(IV) and U(VI). The proposed method is simple, rapid and selective
