Zinc Isotope Fractionation on Benzo-15-crown-5 Resin by Liquid Chromatography

Abstract

Chromatographic fractionation of zinc isotopes was performed on the synthesized benzo-15-crown-5 resin as a column packing material at 323 K in the breakthrough manner for both a frontal and a rear bands. Zinc adsorption capacity was affected by anion chloride concentration and solvent dielectric constant. The heavier zinc isotopes were found enriched to the solution phase and the lighter zinc isotope was concentrated on the resin phase. The frontal maximum enrichment ratio for isotopic pair of 68 Zn/ 64 Zn was 1.0081. The isotope separation coefficients for isotopic pair of 68 Zn/ 64 Zn for frontal and rear band, were 5:3 Â 10 À4 , 4:5 Â 10 À4 , respectively.