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Electropolymerization characterization of paraphenylenediamine using exfoliated graphite doped carbon paste electrode

Abdelaziz Aitsidimou*, Aicha Ouarzane, Khalid Lafdi, Mama El Rhazi

A sensor based on conducting polymer paraphenylenediamine was developed for the voltammetric determination of Pb(II) and Cd(II). The electropolymerization of the incorporated phenylendiamine was carried out in acidic medium by cyclic voltammetry between -0.40 V and 0.90 V and under constant potential. The conducting polymerfor exfoliated graphite doped cpeexhibited a significantly increased sensitivity and selectivity towards Pb(II) and Cd(II)compared with carbon paste electrode. Cadmium and lead were preconcentrated at – 1.1 V on the modified electrode. The measurements were carried out using a square wave voltammetry in an acidicmedium. Under the optimumconditions, a linear range was obtained in the concentration range 0.6-15nmol/L with a correlation coefficient of 0.998. The detection limit were 0.5 and 0.52nmol/L and relative standard deviation for 9 successive determinations of 10.5nmol/L were 2.5% and 2.78%for Pb(II) and Cd(II) respectively. Interference frommetal ions was also studied, and the method was applied to the direct determination of lead and cadmiumin tap water.