Pulse polarography: influence of amalgam formation on the current-potential curves in normal pulse polarography, reverse pulse polarography, differential normal pulse polarography and differential pulse polarography for a slow charge-transfer step

Abstract

Equations for a slow charge transfer reaction in normal pulse polarography (NPP), reverse pulse polarography (RPP), differential normal pulse polarography (DNPP) and differential pulse polarography (DPP), which take into account the cases where the reduction product dissolves both in the electrolyte solution and in the electrode, have been derived in a rigorous way. These equations have been obtained by adopting the expanding sphere electrode model for the DME because amalgam formation is associated with the sphericity of the electrode. Characteristics of the current-potential curves with and without amalgam formation are shown.