▎ 摘　　要

A gold nanoparticles-reduced graphene oxide composite (AuNPs-rGO) was synthesized by chemical co-reduction strategy using ethylene glycol (EG) as a reducing agent. The structure and composition of this AuNPs-rGO composite were characterized by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), as well as the transmission electron microscope (TEM) techniques. Moreover, a glassy carbon electrode (GCE) was modified with this AuNPs-rGO composite by dropping method. The electrochemical behavior and the electrocatalytic activity of this AuNPs-rGO/GCE electrode for the oxidation of sulfite were also investigated using electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The results showed that this AuNPs-rGO/GCE exhibited high electrochemical activity for the oxidation of sulfite under the synergistic action of AuNPs and rGO. In 0.10 mol L-1 H2SO4, the linear range for the determination of sulfite by amperometry at 0.40 V vs SCE was 2.0 x 10(-7) - 2.3 x 10(-3) mol L-1 (r(2) = 0.995 6) with a detection limit of 4.5 x 10(-8) mol L-1 (S/N = 3). The sensitivity for the determination of sulfite is 1026.5 mu A (mmol L-1)(-1) cm(-2). At last, the as-prepared modified electrode was successfully used for the determination of sulfite in red wines with satisfactory results.