Isotope Effects in Oxidation-Reduction Reaction

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Amalgam electrolysis was investigated as the most appropriate system for the research into the isotope effects in oxidation-reduction reactions. The elements of potassium, rubidium, magnesium and barium were selected and the isotope effects of these elements were experimentally studied at different temperatures. Attention was placed on the temperature effects of the isotopic distribution between two phases or the isotope separation coefficient.Two types of the isotope effects have been observed in the amalgam electrolytic processes of potassium and barium ; kinetic isotope effects and equilibrium isotope effects. In kinetic process, where there exists a net mass transfer between two phases, lighter isotope moves faster the other in the direction of the mass transfer. In equilibrium state, where there is no change in the concentrations, heavier isotope is likely fractionated in the amalgam phase in the experimental temperature region. The isotope effects lithium (reported) , rubidium and magnesium in the equilibrium state are different ; lighter isotope is fractionated in the amalgam phase, however, it is very interesting that the following equation is applicable to all amalgam isotope effects in equilibrium considered in the present work.epsilon=A/T+B/T^2