Voltammetric Determination of Ascorbic Acid using Cu Foil Electrode

The electro-oxidation of ascorbic acid has been investigated by cyclic voltammetry on the Cu foil electrode at room temperature. The results show that the electrode exhibits good analytical performance for the electrochemical detection of ascorbic acid (AA) in phosphate buffer solution. The intensities of the anodic cyclic voltammogram peaks increase linearly with the increase of the ascorbic acid concentration from 2.5 to 15 mM at a low applied potential of 0.0 mV vs.SCE and scan rate from 200 to 500 mVmin(-1). The peak current densities are proportional to the square root of the scan rate. This demonstrates that the oxidation reaction on the Cu electrode is a typical diffusion-controlled electrochemical process. These sensors exhibited linear response to change in concentration of AA, the sensitivity was 58.51 mu A/cm(2) mM. Cu electrode exhibits good reproducibility, stability, low detection limit of 0.1 mM, which is better than those at other modified electrodes.

Automated summary

The electro-oxidation of ascorbic acid on a copper foil electrode was studied using cyclic voltammetry, showing good analytical performance. The oxidation reaction on the copper electrode is diffusion-controlled, with linear response to changes in ascorbic acid concentration. The copper electrode demonstrates good reproducibility, stability, and a low detection limit compared to other modified electrodes.