[en] The separation of Cd(II), Co(II), Mn(II), Ni(II), Pb(II), Rb(I), Cr(III), Zn(II), Mg(II), Ca(II), Sr(II), Ba(II) and Fe(III) from an uranium matrix is achieved by means of adsorption on the strongly acidic cation exchanger Dowex 50 X8 from a mixture of 80 volume % hexon, 10 volume % acetone and 10 volume % 12M nitric acid. Following elution of the adsorbed elements by means of 2M nitric acid, these elements are determined by atomic absorption-spectrophotometric methods. The procedure was used for the determination of the above-named elements in sodium-diuranate samples (Yellow Cake specimens) whereby concentrations in the range of 0.5ppm (Cd and Rb) up to over 1 mg/g (Ca and Fe) were determined