Differential potentiometric precipitation titration of zinc(II) and copper(II) using carbon composite electrode

J A Poluboyarinova,S V Shumar

doi:10.1088/1757-899x/597/1/012023

Abstract

The article presents the results of investigation of potentiometric titration of the working solution containing Zn(II) and Cu(II) by sodium diethyldithiocarbamate (NaDEDC) using carbon composite electrode as the indicator electrode. The proposed method for the separate determination of copper ions (II) and zinc (II) under the joint presence was tested on data from titration model of binary mixtures and the real object. The titration curves were processed by the linearization method based on the transformation of a titration curve into the multiphase linear regression, whose parameters determine the equivalence point with high accuracy.

Highlights

Zinc and copper are metals which are widely used in various areas of industry, science and technology
Potentiometric determination of copper and zinc is carried out using metal, ion-selective, carbon and other indicator electrodes [5,6,7,8,9]
An error of Zn(II) and Cu(II) potentiometric determination using composite electrode (CCE) is increased with the solution dilution, which may be attributed to the decrease of the jump in potential near the equivalence point

Summary

Introduction

Zinc and copper are metals which are widely used in various areas of industry, science and technology. Electrochemical methods of analysis are advantageous because of their polyfunctional performance, high accuracy, low cost and simplicity. The efficiency of an electrochemical method is determined by the use of appropriate detection system (i.e. indicating electrode or sensor). Potentiometric determination of copper and zinc is carried out using metal, ion-selective, carbon and other indicator electrodes [5,6,7,8,9]. A new electrochemical sensor, carbon composite electrode (CCE), was previously shown to use in potentiometric determination of some heavy metals [10]. The CCE has been proposed as a sensor for the potentiometric titration of Zn(II) and Cu(II).

Published under licence by IOP Publishing Ltd

Findings

Ratio of the components