Analytical Sciences

Abstract − Analytical Sciences, 19(2), 223 (2003).

Novel PVC-Based Copper(II) Membrane Sensor Based on 2-(1'-(4'-(1''-Hydroxy-2''-naphthyl)methyleneamino)butyl iminomethyl)-1-naphthol
Mohammad Reza GANJALI,*  Mahmood GOLMOHAMMADI,* Mohammad YOUSEFI,* Parviz NOROUZI,* Masoud SALAVATI-NIASARI,** and Mehran JAVANBAKHT***
*Department of Chemistry, Tehran University, Tehran, Iran
**Department of Chemistry, Kashan University, Kashan, Iran
***Department of Chemistry, Tarbiatmodarres University, Tehran, Iran
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 29 mV 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.