Glassy carbon electrode modified with functionalized carbon nanotubes within a poly(allylamine hydrochloride) film for the voltammetric determination of sulfite in foods

摘要

The 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 0.41V whereas at GCE/PAH and GCE, the peak potentials were 0.96 and 0.89V, 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 4.2μM. The electrode was successfully used to determinate sulfite in vinegar, pickle water, coconut water, and shredded coconut.