Study of carbon paste electrode modified with takawt plant for determination of Cu (II) by differential pulse voltammetry

The aim of this study is to develop a sensor based on the carbon paste electrodes (cpes) modified with takawt plant for determination of cu(ii). the measurements were carried out by differential pulse voltammetry (dpv). the cu(ii) ions were chemically deposited onto the surface of takawt natural plant in an acidic medium. the modified electrode exhibited a significantly increased sensitivity and selectivity of cu2+ compared with a bare carbon paste electrode. copper was preconcentrated at open circuit on the modified electrode. factors affecting the accumulation,and stripping steps were investigated and the optimum conditions were employed to develop an analytical procedure. a linear range was obtained in the concentration range 0.5-10 nmol/l with a correlation coefficient of 0.9997. the detection limit was 0.237 nmol/l and relative standard deviation for 10 successive determinations of 1 nmol/l was 1.42%. a study of interfering substance was also performed,and the method was applied to the direct determination of copper in real samples like tap water and industrial waste water.