Maxima in pulse polarography

Abstract

Maxima may occur in pulse polarography under certain circumstances. They have been found in solutions of Zn2+ and Cd2+ ions with very dilute supporting electrolytes. The possibility of adsorption phenomena, which may cause another kind of maxima, has been excluded. Due to the fact that maxima have not yet been systematically studied with the present technique, it is premature to assign them to any particular kind, although they somewhat resemble to classical d.c. polarographic maxima of the first kind. It is shown that larger peak maxima are obtained at short pulse widths and, mainly, at short decay times and that they disappear by increasing either the decay time or the measuring time, or both; by shortening the delay time or by turning to the differential pulse polarographic technique. Some considerations are made on the influence of the double layer and or surface phenomena on the dropping mercury electrode.