Electrochemical Sensor for Sulfite Determination based on a Nanostructured Fe3O4 Modified Electrode

Fe3O4 nanoparticles were synthesized by solvothermal strategy using ethylene glycol (EG). Moreover, a graphite screen printed (SPE) was modified with this Fe3O4 nanoparticles by dropping method. The electrochemical behavior and the electrocatalytic activity of this Fe3O4/SPE electrode for the oxidation of sulfite were also investigated using cyclic voltammetry, chronoamperometry and differential pulse voltammetry. The results showed that this Fe3O4/SPE exhibited high electrochemical activity for the oxidation of sulfite under the synergistic action of Fe3O4 nanoparticles. In the differential pulse voltammetry analysis, under optimized experimental conditions, the oxidation peak increased with an increasing concentration of sulfite in the range of 0.5 to 100.0 μM. The calculated LOD value for sulfite was 0.1 μM. At last, the as-prepared modified electrode was successfully used for the determination of sulfite in real samples.