A method for obtaining the redox state of an aqueous solution as the hydrogen electrode potential, a method for obtaining the effective hydrogen partial pressure of an aqueous solution, and an apparatus for obtaining the redox state of an aqueous solution as the hydrogen electrode potential.

Abstract

[Problem] This invention provides a method and apparatus for obtaining the redox state of an aqueous solution as the hydrogen electrode potential. [Solution] This invention defines the hydrogen electrode potential of an aqueous solution using the Nernst equation. It includes the steps of: measuring the partial pressure of hydrogen in the gas phase at equilibrium with the aqueous solution, temperature, and pH of the aqueous solution; and the step of analyzing the hydrogen electrode potential based on the inverse logarithm of the measured partial pressure of hydrogen (pH²) and temperature or pH. For example, at room temperature (25°C, T = 298.15 K) and pH = 7.0, the hydrogen electrode potential can be calculated using [formula missing]. At a constant pH, the change in the hydrogen electrode potential of the aqueous solution can be calculated using [formula missing]. none

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