Simultaneous anodic stripping voltammetric determination of Pb(II) and Cd(II) using poly methyl thymol blue film-modified electrode

A poly methyl thymol blue (PMTB) film-modified electrode for sensitive and simultaneous determination of lead (II) and cadmium (II) ions using anodic stripping voltammetric techniques were presented. The modified PMTB film has been prepared on paraffin-impegrenated electrode (PIGE) using electrochemical polymerization method by applying potential between - 0.4 and 0.8 V at a scan rate of 50 mV s(-1) for 30 segments in 0.1 M phosphate buffer, pH 7.0 containing 5 x 10(-4) M of methyl thymol blue monomer. The PMTB film electrode has been characterized by FESEM, ATR-IR spectroscopy, and other electroanalytical techniques. In DPV, observed linear range for Pb(II) is 0.54 mu g/L to 77.7 mu g/L and for Cd(II) is 1.05 mu g/L to 75.3 mu g/L with a detection limit of 0.18 mu g/L and 0.35 mu g/L for Pb(II) and Cd(II) respectively. The modified electrode has been successfully tested for real samples analysis and the obtained results are compared with AAS techniques results.