Glassy Carbon Electrode Modified with Functionalized Carbon Nanotubes Within a Poly(allylamine hydrochloride) Film for the Voltammetric Determination of Sulfite in Foods

Abstract

AbstractThe performance of a glassy carbon electrode modified with functionalized multiwalled carbon nanotubes within a poly(allylamine hydrochloride) film (GCE/PAH/MWCNTs) for the voltammetric determination of sulfite in food samples is described. The anodic peak potential for sulfite oxidation at a GCE/PAH/MWCNTs was 0.41 V whereas at GCE/PAH and GCE, the peak potentials were 0.96 and 0.89 V, respectively. Using square‐wave voltammetric technique, the obtained analytical curve was linear in the sulfite concentration range from 1.1×10−5 to 3.9×10−4 M, with a detection limit of 4.2 µM. The electrode was successfully used to determinate sulfite in vinegar, pickle water, coconut water, and shredded coconut.