The residual current in orthophosphate medium

Abstract

The residual current in orthophosphate medium exhibits as many as three waves in addition to the normal mercury dissolution wave. The first of these waves is diffusion controlled while the others are adsorption controlled. At pH values below 4.2, the half-wave potential of the diffusion-controlled wave corresponds well with the potential for the mercury-mercurous phosphate half-cell. No simple potential relationship appears to hold for pH values greater than 4.7. Iodide ion at concentrations of 10-3M destroys the adsorption waves but has no effect on the diffusion wave. © 1962.