Application of Zn(NCS)42- and Co(NCS)42--selective electrodes to the analysis of natural objects and foods

Abstract

Concentrations of zinc and cobalt in beer, mineral water, beets, cheese, potatoes, and soil are determined by potentiometry, using film Zn(NCS)₄^2- and Co(NCS)₄^2--selective electrodes based on higher quaternary ammonium salts. The developed electrodes enable the determination of zinc and cobalt in concentrations lower than their maximum permissible concentrations (MPCs). The procedures do not require complex or long sample preparation or expensive equipment. The results agree well with the data of atomic emission spectrometry and atomic absorption spectrometry.