Abstract
Calcium has been electrochemically inserted from a 1:2(v/v) mixed solution of ethylene carbonate and methylethyl carbonate containing 0.5mol dm−3 Ca(ClO4)2 into graphite, and the calcium isotope fractionation accompanying the insertion was observed. The lighter isotope, 40Ca, was preferentially fractionated into graphite. The single-stage separation coefficient for the 48Ca/40Ca isotopic pair ranged from 1.0×10−3 to 7.2×10−3 at 50°C. These experimental results were qualitatively consistent with the estimation of the equilibrium constant of the calcium isotope exchange reaction between the calcium ion in the electrolyte solution and the calcium atom in graphite based on molecular orbital calculations of the reduced partition function ratios of the calcium species involved in the equilibrium.
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