Zinc Isotope Effects Observed by Liquid Chromatography with Benzo-15-Crown-5 Resin

Abstract

The chromatographic fractionation in Zn isotopes was performed on the synthesized benzo-15-crown-5 resin at 313 and 343 K. The lighter isotopes were found enriched in the resin phase. The isotope fractionation coefficients (") were 3. Zn isotopic pairs at 313 and 343 K, respectively. They reflected mass-dependence among the Zn isotopes at each operated temperature but did not show 1=T 2 -temperature proportionality. The temperature effects of the composition of Zn species both in the solution phase and in the resin phase may account in part for the latter observation. The magnitudes of "'s in this study were comparable to the ones obtained by ion exchange chromatography, but much smaller than those observed in the solvent extraction systems with a crown ether in the organic phase.

Strontium Isotope Effects Observed in Liquid Chromatography with Crown Ether Resins

“…23) Some properties of the silica beads and the resin are summarized in Table 1. We previously observed zinc isotope effects with the B15C5 resin, 24,25) and we expected that it would also be effective for observing strontium isotope effects. The dicyclohexano-18-crown-6 ether (DC18C6) resin (Eichrom Technologies Co. Ltd. Sr resin) was also used as column packing material.…”

Zinc Isotope Effects in Benzo Crown Resin by Displacement Chromatography

“…14) As regard to zinc isotope separation, cation ion exchange chromatography utilizing complex formation with EDTA had yielded a small equilibrium separation factor. 15,16) The liquid-liquid extraction method with a crown ether exhibited a larger separation factor. 11) The single-stage liquid-liquid extraction was a simple method, and for the practical enrichment of isotopes, a multistage system was necessary.…”

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

“…22) The value of this work agreed with the value by the same type crown ether which was obtained in 1.0 mol.dm À3 hydrochloric acid solution by Oi and his group. 15,16)…”

“…Recently, a number of papers on the benzo-15-crown-5 resin for application to the zinc isotope separation by chromatography have been published. [14][15][16][17][18] In the present work, chromatography was performed on the synthesized benzo crown resin. This is the first report on zinc isotope chromatographic fractionation for both frontal and rear bands, and the emphasis was placed on the separation coefficient observed at both frontal and rear bands during the separation process.…”