Development of an electrochemical sensor utilizing MWCNs-poly (2-aminothiophenol) @AgNPs nanocomposite for the simultaneous determination of Pb2+and Cd2+in food samples

This study focuses on the synthesis and characterization of the Multiwall Carbon Nanotubes-Poly(2aminothiophenol) @silver nanoparticles nanocomposite (MWCNTs-PATP@AgNPs) using different analytical methods. The synthesized MWCNTs-PATP@AgNPs served as an electrocatalytic modifier, enabling the highly selective and sensitive detection of Pb2+ and Cd2+ ions at nanomolar levels using square wave anodic stripping voltammetry. The concentration of MWCNTs- PATP @AgNPs, the type and concentration of the electrolyte, the solution's pH, and the preconcentration conditions, were systematically optimized. A linear response was observed for Pb2+ and Cd2+ within the ranges of 0.5-60.0 nmolL- 1 and 8.0-50.0 nmol L- 1, respectively, with detection limits of 0.125 nmol L- 1 for Pb2+ and 1.47 nmol L- 1 for Cd2+. Furthermore, the MWCNTsPATP@AgNPs sensor demonstrated the capability to selectively detect these target metals in the presence of various common interfering species. The sensor was effectively utilized for the detection of Pb2+ and Cd2+ ions across various real samples.