POTENTIOMETRIC FLOW-INJECTION DETECTION OF COPPER(II) WITH A GRAPHITECARBON ELECTRODE

A graphite carbon electrode has been evaluated in a potentiometric now injection system for the detection of Cu2+. The electrode response ch aracteristics were investigated by both cyclic voltammetry and potenti ometry, and it is suggested that the electrode potential change result s in the adsorption of CU2+ at the electrode surface. The carbon elect rode was used for the now injection potentiometric detection of CU2+ i n 0.05 mol/L NaAc-0.2 mol/L NaCl at pH of 6.0 carrier solution. A line ar response in concentration range of 1x10(-5) - 1x10(-2) mol/L was ob tained with a detection limit of 5x10(-5) mol/L. The electrode describ ed in this paper is simple and low cost.