High interfacial performance of MWCNTs with chitosan on glassy carbon electrode for voltammetric trace analysis of Cd(II) and toxic metal ions

Abstract

Glassy carbon electrode was nanostructured and assembled with a scaffold of multiwalled carbon nanotubes and chitosan biopolymer for Cadmiun (II) ion detection in aqueous solutions. Using cyclic voltammetry (CV) and electrochemical impedance spectroscopy, the arrangement was characterized. The optimization of different parameters for the electrochemical detection ion Cadmiun ions were properly done using square wave voltammetry (SWV). A buffer of acetates and pH of 5 was used. Results showed a limit of detection of 0.09 μg L-1. Selectivity in detection was demonstrated was ensured using SWV as well with this modified electrode for Cd(II) detection in presence of another toxic heavy metal ions: Pb(II), Co(II) 30 μg L-1 and Hg(II) 100 μg L-1. This arrangement coupled with square wave voltammetry constitutes a different perspective for further investigations in the simultaneous detection of this species as well in a very low limit of detection.