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

Abstract

Abstract 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 Zn 2+ , Cd 2+ and Pb 2+ 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 0.5–100 µg L −1 for Zn 2+ and 0.5–80 µg L −1 for Cd 2+ . Uniquely, the linear curve for Pb 2+ ranges from 0.05–100 µg L −1 with a detection limit of 0.01 µg L −1 . The practical application was verified in real samples with satisfactory results.