Novel PVC-Based Copper(II) Membrane Sensor Based on 2-(1′-(4′-(1″-Hydroxy-2″-naphthyl)methyleneamino)butyl iminomethyl)-1-naphthol

Abstract

A copper(II) ion-selective PVC membrane sensor based on 2-(1′-(4′-(1″-hydroxy-2″-naphthyl)methyleneamino)butyl iminomethyl)-1-naphthol (BHNB) as a novel Schiff base containing a sensing material has been successfully developed. The sensor exhibits a good linear response of 29mV per decade within the concentration range of 10^-1-10^-6 M of Cu²⁺. The sensor shows good selectivity for copper(II) ion in comparison with alkali, alkaline earth, transition and heavy metal ions. The BHNB-based sensor is suitable for use with aqueous solutions of pH 3.5-7.0 and displays minimal interference by Sr(II), Cd(II), Hg(II), Zn(II) and Pb(II), which are known to interfere with other previously suggested electrodes. The proposed membrane electrode was used as a sensor for determining the Cu(II) content in black tea samples. It was also applied as an indicator electrode in the potentiometric titration of Cu²⁺ ions with EDTA.