Add time:08/10/2019         Source:sciencedirect.com

A carbon paste electrode (CPE) modified with a nanocomposite consisting on functionalized multiwalled carbon nanotubes, polypyrrole film (PPy) and bismuth particles is described for simultaneous determination of Pb(II) and Cd(II). The structural and surface properties of the functionalized multiwalled carbon nanotubes and the nanocomposite were investigated by Fourier transform infrared spectroscopy and field-emission gun scanning electron microscopy. The electrical properties were studied by cyclic voltammetry and electrochemical impedance spectroscopy. The modified CPE was applied to the determination of Pb(II) and Cd(II) using square wave anodic stripping voltammetry. Under optimized conditions, the calibration plot is linear in the range from 0.11 to 120 μg L−1 for Pb(II) and 0.16 to 120 μg L−1 for Cd(II), the detection limits are 99 and 157 ng L−1, respectively. The sensor was applied to analysis of Pb(II) and Cd(II) in spiked real samples of tap water and gave satisfactory results.

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