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The assay for monitoring the content of sulfite ions (SO3 ) is essentially important because sulfite has some seriously toxic effects on both environment and human health. For this, a SO3 2electrochemical sensor was fabricated utilizing molybdenum disulfide (MoS2) and Nafion. The cyclic voltammetry (CV) and differential pulse voltammetry (DPV) showed that MoS2 had excellently catalytical activity for the redox of SO3 . After the conditions, such as the acidity of supporting electrolyte, scan rates, and other factors,for the electrochemical response of SO3 were optimized, the proposed sensor showed a wide dynamic linear range from 5.0  10 to 0.5 mM (r = 0.997, n = 15) for determination of SO3 2with the limit of detection (LOD) of 3.3  10 mM, which can be applied for detecting the content of SO3 2in water with the advantages of good reproducibility, anti-interference, long-term stability and satisfactory recovery.

An Electrochemical Sensor for Determination of Sulfite (SO32-) in Water Based on Molybdenum Disulfide Flakes/Nafion Modified Electrode