Coated-Wire Ion-Selective Electrodes Based on Chlorideand Cyanide Complexes of Zinc and their Application to Zinc Monitoring in the Electrogalvanizing Process

Abstract

An indirect potentiometric method based on the selective monitoring of chlorozincate (II) or cyanozincate (II) anions with a coated-wire electrode was studied. The electroactive membrane contains either the chlorozincate or the cyanozincate salt of the tricaprylylmethylammonium cation (Aliquat 336S). Both electrodes show a useful response over the concentration range from 10⁻⁵ to 10⁻¹M Zn (II) in chloride or cyanide containing solutions. Interferences arise only from a few transition metals such as Cu (II), Cd (II) and Hg (II). This method can be applied to the conditions used in the electrogalvanizing process and to industrial waste management from electroplating plants.

Key Words:

• zinc complexes
• zinc determination
• coated-wire electrode
• ion-selective electrode
• electrogalvanizing process