Facile and Simultaneous Stripping Determination of Zinc, Cadmium and Lead on Disposable Multiwalled Carbon Nanotubes Modified Screen-Printed Electrode

Screen-printed electrodes (SPEs) are cheap and disposable. But their application for heavy metal detection is limited due to the low sensitivity and poor selectivity. Here we report the ultrasensitive and simultaneous determination of Zn2+, Cd2+ and Pb2+ on a multiwalled carbon nanotubes and Nafion composite modified SPE with in situ plated bismuth film (MWCNTs/NA/Bi/SPE). The linear curves range from 0.5100 mu gL1 for Zn2+ and 0.580 mu gL1 for Cd2+. Uniquely, the linear curve for Pb2+ ranges from 0.05100 mu gL1 with a detection limit of 0.01 mu gL1. The practical application was verified in real samples with satisfactory results.