Electrocatalytic Oxidation of Sulfite and its Highly Sensitive Determination on Graphite Screen Printed Electrode Modified with New Schiff base Compound

An electrochemical method for determination of sulfite has been developed using Schiff base modified graphite screen printed electrodes as a disposable chemosensor. The modified graphite screen printed electrode was characterized with voltammetry. Differential pulse voltammogram of modified SPE in the presence of sulfite showed a characteristic peak current at 350 mV. A linear response of the sensor was observed in the concentration range of 0.5-300.0 µM of the analyte. The limit of detection (LOD) was found to be 0.3 μM for sulfite. The method has been used for the determination of sulfite in the natural water samples. These analytical figures of merit evidence the outstanding performance of the modified electrode, which was also successfully applied to the determination of sulfite in environmental and biological samples.