Abstract
Liquid chromatography using highly porous silica beads in which the pores were embedded with a benzo-15-crown-5 ether resin or using dicyclohexano-18-crown-6 ether resin as column packing material was employed to study strontium isotope fractionation. While no appreciable isotope effects of strontium were observed for the dicyclohexano-18-crown-6 ether resin, the enrichment of heavier isotopes of strontium was observed in the frontal parts of the strontium chromatograms for the benzo-15-crown-5 ether resin with the isotope effects on the order of 10−4. The observed strontium isotope effects were massdependent, indicating that they mostly come from isotope effects based on molecular vibration. Molecular orbital calculations supported the present experimental results in a qualitative fashion.
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