Electrooxidation of Se on nanodispersed films of titanium dioxide modified with ZnO and Au

Selenium electrooxidation process on TiO2 and TiO2/ZnO electrodes, modified by gold nanoparticles, was investigated in solutions of sulfuric, chloric and citric acids. It is shown that TiO2/ZnO/Au electrodes can be used as indicator electrodes at the determination of selenium by anodic stripping voltammetry method. Optimum conditions of selenium (IV) determination are: supporting solution 0,001М H2SO4, electroconcentrating potential -(1,3¸1,5) V; time of electrolysis 120 s, scanning speed of potential 20 mV/s