ali akbari

Abstract- A sensitive and selective electrochemical method for the determination of ascorbic acid (AA) was developed using a modified TiO2 nanoparticles carbon paste electrode. Cyclic voltammetry was used to investigate the redox properties of this modified electrode at various solution pH values and at various scan rates. This modified carbon paste electrode shows excellent electrocatalytic activity toward the oxidation of AA in a phosphate buffer solution (pH 8.0). The linear range of 0.3 to 20.0 μM and a detection limit of 1.43 × 10-7 M were observed in pH 8.0 phosphate buffer solution. Also, the modified ectrode was employed for the determination of AA in the real samples such as AA ampoule using standard addition method.