Properties of the ion-selective electrode with a chelating pseudo-liquid membrane phase for zinc determination

Abstract

An optimal composition for pseudo-liquid membrane chelating potential phase of a zinc function pseudoliquid electrode was established. Its basic analytical parameters, such as the slope of characteristics (29 mV pa_Zn⁻¹), the detection limit (5.6 × 10⁻⁶ mol dm⁻³), lifetime (40 d), response time (10 s), selectivity against nickel, cobalt, cadmium, calcium, magnesium and sodium ions, as well as the dependence of the electrode potential on pH, were established. The electrode was used to determine the presence of zinc ions in vitamin preparations. The results obtained were compared with the determination made by use of a voltammetric method.