REINTERPRETATION OF REDUCTION POTENTIAL MEASUREMENTS DONE BY LINEAR SWEEP VOLTAMMETRY IN SILICATE MELTS

We have determined experimentally the equilibrium concentrations of Ni between silicate melt and Pt as a function of oxygen fugacity. The results demonstrate that metallic species derived in linear sweep voltammetry experiments in silicate melts are diffusing into Pt electrodes and not into the melt, as was concluded by previous studies. This requires reinterpretation of previous linear sweep voltammetry results and recalculation and correction of reported reduction potentials. In this paper, we report these corrected reduction potentials. We also report activity coefficients for Ni in synthetic basalt and diopsidic melts and for Co in diopsidic melt.