Cathodic Stripping Voltammetric Determination of Essential Element (Copper and Zinc) in Drinking Water

In this work, a selective and sensitive method to the determination of essential elements cu and zn in drinking water proposed by adsorptive stripping differential pulse cathodic voltammetry (adsdpcv) using alizarin (az) as a ligand. the complexes of metals-az were deposited onto a hanging mercury drop electrode (hmde) and the resulting current was analyzed. increase peak current of metals-az obtained optimization condition of ph 6, az concentration 0.04 mmol/l, supporting electrolyte concentration 0.5 mol/l, potential for adsorptive deposition (e_ads) -0.1 v, the time for adsorptive deposition (t_ads) 70 s, respectively, the instrumental parameters (drop size of mercury 8 and scan rate 800 ms/v). the linearity of metals were160 ng/l and 200 ng/l, the limit of detection 0.1 ng/l for cu and 0.05 ng/l for zn, respectively. relative standard deviation (rsd) 0.5% for cu and 0.7% for zn and recovery cu and zn in the range 98 to 101%, respectively. the applicability of adsdpcv methods is successfully for determination of metals in drinking water.