| Abstract: | Displacement chromatographies of Gd adsorption band in cation exchange resin were performed to observe the isotope effects in the Gd ion exchange processes involving complex forming reagents. The heavy isotope of 160Gd was found to be enriched at the front boundary of Gd adsorption band and the lighter isotopes of 1MGd, 156Gd and 157Gd were enriched at the rear boundary in both cases of 20.1m elution with EDTA and 14 m elution with malic acid, as predicted in the theoretical relations. Observed separation coefficients are 4.9×10?5, 4.0×10?5 and 2.5×10?5for isotopie pairs of 156 160Gd, 158Gd and 160Gd, respectively, in the case of EDTA elution. In the case of malic acid elution, smaller separation coefficients were observed as 1.8×10?5, 1.6 5O?5 and 0.92×10?5 for isotopie pairs of 156 160Gd, 157Gd and158 160 respectively. |
