Resumen:
n the present work, we report an electrochemical sensor for the selective and sensitive quantification of Pb(II) based the use of glassy carbon electrodes (GCEs) modified with double-walled carbon nanotubes (DWCNTs) noncovalently functionalized with Allium sativum extract (garlic extract, Gar), (GCE/DWCNTs-Gar). FTIR, UV?vis spectroscopy, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry were used to characterize the DWCNTs-Gar dispersion. Pb(II) was accumulated at GCE/DWCNTs-Gar at open circuit potential for 20.0 min via complex formation with the organosulfur compounds residues present in the Gar extract, followed by thereduction at − 0.900 V, and final reoxidation by voltammetric stripping. The sensitivity was (72 ± 8) × 10− 3 μA μg− 1 L, the reproducibility was 11.1% using five different dispersions, and the detection limit was 1.5 μg L− 1 . The quantification of Pb(II) was highly selective even in the presence of other cati