Collect. Czech. Chem. Commun. 1989, 54, 42-52

Electrochemical behaviour of 2,5-dihydroxyanisole on a mercury electrode in aqueous media

Dimitra Sazou and Ioannis Poulios

Laboratory of Physical Chemistry, Department of Chemistry, University of Thessaloniki, 54006 Thessaloniki, Greece


Electrochemical investigation of 2,5-dihydroxyanisole (2,5-DHA) has been carried out in aqueous solutions in pH range 2-11 on hanging mercury drop electrode (HMDE). The oxidation process in pH range 2-6 is a quasi-reversible electrode reaction which involves the transfer of two electrons and two protons. By use of semi-integration a dependence of the heterogeneous rate constant on the potential has been appreciated. Thus, the variation of peak current with pH changes can be explained. In more basic solutions the electrooxidation is complicated by subsequent chemical reactions as indicated from the calculated voltammetric and chronoamperometric parameters.