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Amperometric Determination of L-Ascorbic Acid Using Copper Hexacyanoferrate Nanoparticles Modified Electrode

A new approach was attempted to prepare a chemically modified electrode using copper hexacyanoferrate (CuHCF) nanoparticles as the redox mediator and to study its stability and electrocatalytic activity for ascorbic acid (AA) oxidation. The CuHCF modified electrode was prepared and characterized using cyclic voltammetry. The effect of scan rate, supporting electrolyte and pH of the medium on the performance of the modified electrode was investigated. The CuHCF modified electrode exhibited good electrocatalytic activity towards the oxidation of ascorbic acid and gavea linear response4×106 M to 4.9×10-4M with a correlation coefficient of 0.995). Hydrodynamic voltammetry and chronoamperometry studies for the oxidation of ascorbic acid were also carried out. The electrode was highly stable and exhibited good reproducibility. This modified electrode was also applied for the determination of ascorbic acid in commercial samples.