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

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.