Covalent anchoring of cobalt hexacyanoferrate particles on graphitic carbon: A simple and renewable robust pellet electrode as an electrochemical interface for amperometric quantification of sulfite

- Covalent anchoring of CoHCF particles on graphitic carbon.
- Using p-phenylenediamine as a linker molecule.
- Binderless robust pellet electrode of CoHCF modified carbon.
- Quantification of sulfite from various food sample matrices.

A simple strategy has been proposed for the covalent anchoring of cobalt hexacyanoferrate (CoHCF) particles on graphitic carbon substrate using p-phenylenediamine as a linker molecule. The covalent anchoring was confirmed by X-ray diffraction, Fourier transform infrared spectroscopy and electrochemical studies. A robust pellet electrode was fabricated using CoHCF particles modified graphitic carbon and it has been applied in the electrocatalytic oxidation of sulfite. The proposed sensor showed a linearity in the concentration range 4-128 μM of sulfite with a limit of detection (LOD) 1.7 μM and limit of quantification (LOQ) 5.8 μM. Proposed sensor has been successfully applied to measure sulfite levels from a variety of food sample matrices. The results obtained by the proposed electrochemical sensor have been compared with the iodimetric method.

Binderless pellet electrode constructed using chemically derivatized graphitic carbon with CoHCF used as a renewable electrode for sensing sulfite.69