ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Electrochemical oscillations of the system Hg|HSO₄^-|BrO₃^-

A. Olexová and Ľ. Treindl

Department of Physical Chemistry, Faculty of Natural Sciences, Komenský University, CS-842 15 Bratislava

Abstract:  The electrochemical oscillations of the system Hg|HSO₄^-|BrO₃^-  which arise at a dropping mercury electrode in the solution of H₂SO₄ in the presence of sodium bromate in the interval of potentials ⟨+0.06 V, +0.02 V⟩  referred to the potential of the electrode Hg₂SO₄ (c = 2 mol dm^-3)|Hg are described in this paper. The nonlinear increase in anodic current and linear increase in surface tension of the dropping mercury electrode periodically vary with time in the course of a few hours. A probable mechanism giving rise to electrochemical oscillations which have not been described yet is discussed. The basis of this mechanism is simulta­neous electroreduction of bromates and electrooxidation of mercury bringing about the formation of surface film.

Full paper in Portable Document Format: 382a145.pdf

Chemical Papers 38 (2) 145–150 (1984)