Nanostructured Base Electrochemical Sensor for Determination of Sulfite

作者：Moghaddam Hadi Mahmoudi^*; Malakootian Mohammad; Beitollah Hadis; Biparva Pourya

来源：International Journal of Electrochemical Science, 2014, 9(1): 327-341.

DOI：10.1016/s1452-3981(23)07720-9

• Sulfite Determination
• Carbon Nanotubes
• Modified electrode
• Voltammetry

A novel carbon paste electrode modified with carbon nanotube and benzoylferrocene (BF) was fabricated. The electrochemical study of the modified electrode, as well as its efficiency for electrocatalytic oxidation of sulfite is described. Cyclic voltammetry was used to investigate the redox properties of this modified electrode. The electrode was also employed to study the electrocatalytic oxidation of sulfite, using cyclic voltammetry, chronoamperometry and square wave voltammetry as diagnostic techniques. It has been found that the oxidation of sulfite at the surface of modified electrode occurs at a potential of about 240 mV less positive than that of an unmodified CPE. The diffusion coefficient, electron transfer coefficient, and heterogeneous rate constant, for oxidation of sulfite at the modified electrode surface were also determined. Square wave voltammetry exhibits a linear dynamic range from 1.0x10(-7) to 4.0x10(-4) M and a detection limit of 90.0 nM for sulfite. Finally this modified electrode was used for determination of sulfite in real samples.

• 出版日期2014-1