Considerable progress has been made concerning the interpretation of the combined effect of electric and magnetic fields in electrolyte solution [l-4]. It was shown on the basis of the Boltzmann equation that the ionic mobility and the thermal and mass-diffusion coefficients are magnetic field-dependent tensorial quantities. In recent years, interest has been directed increasingly to magnetoelec- trolysis, i.e. the effect of a magnetic field in electrochemistry, either for academic purposes or in view of practical applications [5-141. A comprehensive review including an extensive bibliography has been published recently [15]. In particular, the effect of a magnetic field on the mass transport phenomena involved in a reaction mechanism occurring at an electrode/electrolyte interface has been investigated. According to the works published, a magnetic field coupled with an electric field can generate solution streams, thereby reducing the boundary layer thickness and consequently improving the mass transport rate. Previous authors have observed a variation of the limiting current proportional to B113 or B”* when the magnetic field density B is changed, following the geometry and the experimen- tal conditions [6]. They have also noticed an influence of the orientation of the magnetic field. The enhancement of the limiting current by an imposed magnetic field is generally interpreted as the consequence of a magnetohydrodynamic (MHD) effect.