A sulfite sensor based on electrocatalytic oxidation at a phenothiazine drop-coated screen-printed carbon electrode

This paper describes an easy-to-prepare and disposable sulfite sensor using a phenothiazine drop-coated screen printed carbon electrode (PhSPCE) in couple with flow injection analysis. It was found that the PhSPCE possesses electrocatalytic activity toward the oxidation of sulfite with relatively high sensitivity, selectivity, good stability and reproducibility. The linear working range for the determination of sulfite was 0.6 ppm to 200 ppm with a detection limit of 0.28 ppm. The proposed method was successfully applied to the determination of sulfite in real samples.