An Electrochemical Sensor For Determination Of Sulfite (So32-) In Water Based On Molybdenum Disulfide Flakes/Nafion Modified Electrode

The assay for monitoring the content of sulfite ions (SO32-) is essentially important because sulfite has some seriously toxic effects on both environment and human health. For this, a SO32- electrochemical 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 SO32-. After the conditions, such as the acidity of supporting electrolyte, scan rates, and other factors, for the electrochemical response of SO32- were optimized, the proposed sensor showed a wide dynamic linear range from 5.0 x 10(-3) to 0.5 mM (r = 0.997, n = 15) for determination of SO32- with the limit of detection (LOD) of 3.3 x 10(-3) mM, which can be applied for detecting the content of SO32- in water with the advantages of good reproducibility, anti -interference, long-term stability and satisfactory recovery.