Development of New Copper(II) Ion-Selective Poly(vinyl chloride) Membrane Electrode Based on 2,6-Diacetylpyridine-(1R)-(-)-Fenchone Diazine Ligand

The construction and performance characteristics of polymeric membrane electrodes based on 2,6-diacetylpyridine-(1R)-(-)-fenchone diazine ligand (A) for quantification of copper ions, are described. Effect of various plasticizers and anion excluder, sodium tetraphenylborate (NaTPB) was studied and improved performance was observed at several instances. Best performance was obtained with the membrane having the following composition; A (7): PVC (50): TMDP (86): NaTPB (1). The membrane electrodes exhibits Nernstian response in the concentration range of 1.0×10−5 to 1.0×10−1 M with a detection limit of 2.5×10−6 M and wide pH range (4.0–8.0). The potentiometric selectivity coefficient values as determined by fixed interference method indicate excellent selectivity for copper ions over interfering cations. Each electrode possesses a fast response time of below 20s and a shelf life period of 3 months. The analytical utility of the proposed electrode was demonstrated by its application in the determination of copper in wastewater samples and the results were in agreement with those obtained with an atomic absorption spectroscopy (AAS) method.