Article Chromatographic Zinc Isotope Separation by Chelating Exchange Resin
you can separate isotopes, but with a "generic chromatography" it would be expectable that the effect is negligible. The best verification for isotope dietributions is properly resolving mass spectrometry.
The zirconium isotope of geological samples can be fractionated during the chemical separation process, and this fractionation can be corrected using the double spike method. The choice of analytical technique and the quality of the separation process can significantly impact the accuracy of the Zr isotope analysis.