Simultaneous Adsorptive Stripping Differential Pulse Voltammetric Measurements of Trace Lead, Cadmium and Nickel in the Presence of 2-aminobenzoic Acid

Document Type: Research Paper

Authors

1 1Department of Basic Sciences, Farhangian University, Tehran, Iran

2 Department of Chemistry, Faculty of Science, Semnan University, Semnan 35195-363, Iran

3 2Department of Chemistry, Faculty of Science, Semnan University, Semnan 35195-363, Iran

Abstract

In this study, 2-aminobenzoic acid (ABA) has been used as complexing ligand for simultaneous
determination of metal ions by adsorptive cathodic stripping voltammetry (AdCSV), for the first
time. Thus, a selective and sensitive procedure was presented for simultaneous determination of
lead, cadmium and nickel using ABA and differential pulse-adsorptive cathodic stripping
voltammetry (DP-AdCSV). The method was based on adsorptive accumulation of the complexes of
Pb(II), Cd(II) and Ni(II) ions with ABA onto hanging mercury drop electrode (HMDE), followed
by reduction of adsorbed species by differential pulse cathodic stripping voltammetry. The effect of
experimental parameters such as pH, ABA concentration, accumulation time and potentialand scan
rate on the electrode response was examined. Under the optimized conditions, linear calibration
curves were established for the concentration of Pb(II), Cd(II) and Ni(II) in the ranges of 5-150, 5-
120 and 5-150 ng mL-1, respectively. Detection limits of 1.78, 2.26 and 1.78 ng mL-1 were obtained
for Pb(II), Cd(II) and Ni(II), respectively. An application of the proposed method was reported for
determination of these elements in tap water and industrial waste water of as real samples.

Keywords