Application of Adsorptive Cathodic Stripping Voltammetry for Determination of Trace Amounts of Zinc Using Nalidixic Acid as a Chelating Agent

A sensitive method for determination of trace zinc based on adsorptive preconcentration of zinc-nalidixic acid (NAL) complex onto the surface of a hanging mercury drop electrode (HMDE) has been described Optimum conditions of determination were as Follows pH 8.7, 90 mu mol L-1 NAL, accumulation potential -800 mV, and accumulation time 120 s Under optimal conditions, a linear calibration graph in Zn range 15-2500 nmol L-1 and detection limit of 5 nmol L-1 were obtained. Relative standard deviation for 80 nmol L-1 concentration was 2.3% (n = 10) The effect of positively and negatively charged tons oil the peak height of Zn-NAL complex was evaluated The method was applied to the determination of zinc in spring water. tap water, seawater, dry tea, Tab. Sanatogen gold A-Z, and NIST certified reference material with satisfactory results