Simultaneous Determination of Trace Zinc(II) and Cadmium(II) by Differential Pulse Anodic Stripping Voltammetry Using a MWCNTs-NaDBS Modified Stannum Film Electrode

A multiwalled carbon nanotubes-sodium dodecyl benzene sulfonate (MWCNTs-NaDBS) modified stannum film electrode was employed for the determination of cadmium(II) and zinc(II). The Sn/MWCNTs-NaDBS film electrode was prepared by applying MWCNTs-NaDBS suspension to the surface of the GCE, while the Sn film was plated in situ simultaneously with the target metal ions. Under optimal conditions, linear calibration curves were obtained in a ranae of 5.0 - 100.0 mu g L-1 with detection limits of 0.9 mu g L-1 for zinc(II) and 0.8 mu g L-1 for cadmium(II), respectively. This film electrode was successfully applied to the determination of Zn(II) and Cd(II) in tap water sample.