電極表面連続研磨器具付き白金電極を用いる水溶液酸化還元電位の安定測定

抄録

A performance test for a redox potential measurement of a solution was conducted using continuously polished and untreated platinum working electrodes under an inert condition. The redox potential, measured by a polished electrode, immediately showed steady value which approximately coincided with the equilibrium value of redox reaction between HS⁻ and S₄²⁻. Thus, the redox potentials could be controlled by the equilibrium of the redox reaction. On the other hand, the redox potential measured by an untreated electrode was +0.2 V higher than that measured by a continuously polished electrode. The measured redox potential implies that SO₄²⁻ was the dominant species in the solution. A disagreement of the redox potentials measured by polished and untreated electrodes may have been caused by deactivation of the platinum electrode by the adsorption of sulfuric acid anions.