Differential pulse anodic stripping voltammetry determination of copper (II) at glassy carbon electrode in the presence of bis(benzylidene)ethylenediamine as a novel complexing agent

Abstract

This paper reports on the application of synthesized Schiff base bis(benzylidene)ethylenediamine (BBE) to increase the detection sensitivity of copper (II) at 0.01 V vs Ag/AgCl using glassy carbon electrode. Aliquot of 2.0×10 -3 M of BBE in DMF solution containing BR buffer pH 6 was introduced into the voltammetric cell followed by the addition of Cu(II) ions and then further proceeded to differential pulse anodic-stripping scan from -1.4 V to +0.3 V vs Ag/AgCl. The optimum parameters obtained were; scan rate; 25 mV/s, accumulation time; 200 sec and accumulation potential; -0.6 V. Under the optimal conditions, the detection limit of 0.4 µgL -1 and a linear response in the range of 1-10 µgL-1 were obtained. The effects of interfering ions such as Cd(II), Cr(III), Fe(II), Pb(II) and Zn(II) were also investigated. The practical applicability of this technique was illustrated by the determination of Cu(II) ions at 3µgL -1 concentration level in tap water with 94.43% of recovery.