Abstract
ABSTRACT Using cation-and anion-exchange resins, ion-exchange displacement chromatography of copper has been carried out to study the copper isotope effects in the ligand exchange system (LXS) and the electron exchange system (EXS), respectively. In the LXS, where malate was chosen as the ligand for Cu2+ ions, the heavier isotope 65Cu has been enriched at the front part of the copper chromatogram, which means that the heavier isotope 65Cu is preferentially fractionated into the malate complex in the solution phase. In the EXS, where the Cu(I)/Cu(II) exchange reaction takes place in the HCl-anion exchanger resin system, the lighter isotope 63Cu has been observed to be enriched at the Cu(I) chloride anion complex side. The result shows that the lighter isotope is preferentially fractionated into the anion exchange resin phase. The values of the single-stage separation coefficients (e = S — 1) of the 63Cu65Cu isotopic pair have been calculated for LXS as 2.8 X 10∼4 at 40°C and for EXS as 3.8 X 10∼4 at 60°C.
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