Abstract
This work delineates a simple and sensitive mercury free electrode as an electrochemical sensor for simultaneous determination of Pb (II) and Cd (II) using multiwalled carbon nanotubes wrapped poly O-cresophthalein complexone film (MWCNTs-POCF) modified electrode by anodic stripping voltammetry. The surface morphology of MWCNTs-POCF modified electrode was characterized by scanning electron microscopy (SEM). MWCNTs-POCF electrode was also characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (ESI). Differential pulse anodic stripping voltammetry (DPASV) was employed for the determination of Pb (II) and Cd (II) ions. When compared with MWCNTs and POCF modified electrodes, MWCNTs-POCF modified electrode exhibited good analytical performance towards the determination of Pb (II) and Cd (II) ions in terms of sensitivity and simplicity. Certain electrochemical parameters to regulate and improve the performance of the sensor were examined. Under optimized experimental conditions the modified electrode exhibited a detection limit of 0.98 μg/L for Pb (II) and 1.9 μg/L for Cd (II). The analytical proficiency of the developed metal ion sensor was used for the determination of Pb (II) and Cd (II) in the real water sample and the results obtained were satisfactory with very good recovery.
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