engleski

Components of the Net Current in Differential Pulse Polarography

As the modern (voltammetric) software packages offer “ resolution” of each individual net signal in differential pulse polarography (DPP) to its components, an attempt was made to test such a possibility on several model systems. Reversible and nonreversible reduction processes of simple metal ions (Cd2+, Eu3+) were included, together with some examples of the anion induced adsorption (Cd2+-I-and Pb2+-Br- systems) under conditions of partly or fully covered electrode surface. Taking into account that so called “ backward” current is in fact dc wave, it could be said that one technique is hidden within the other. Consequently, DPP measurements together with following of the “ backward” signals could give more information and save the time. “ Forward” component offers additional possibilities in data treatment, especially when its relationship to the “ backward” current (with respect to the potential and height) is taken into account. Such an approach seems promising, even when applied on a purely qualitative level, because some effects which cannot be observed if only the net signals are followed become obvious when their components are taken into consideration.

Differential pulse polarography; Forward current; Backward current; Cadmium; Lead; Europium; Anion induced adsorption

nije evidentirano