Abstract
Electrolytic fractionation of calcium isotopes was studied using a streaming mercury cathode in relation to the cell potential. Isotopic ratios, 48Ca/42Ca, were measured by a solid-source massspectrometer MS-5 manufactured by A.E.I., England. From the observed increasing tendency of the sepration factor, a42-48;, with decreasing the cell potential, the upper limit ofαwas estimated by extrapolation as 1.0135, which was expected to be obtained at the isotopic exchange equilibrium. This value is in fact close to the equilibrium data appeared in literatures. Possible mechanisms of the fractionation were discussed.
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