Fabrication of TiO2 Nanoparticles Carbon Paste Electrode Bulk-Modified with Novel Hydroquinone for Determination of Ascorbic Acid

A sensitive and selective electrochemical method for the determination ofascorbic acid (aa) was developed using a modified tio2 nanoparticles carbon pasteelectrode. cyclic voltammetry was used to investigate the redox properties of thismodified electrode at various solution ph values and at various scan rates. thismodified carbon paste electrode shows excellent electrocatalytic activity toward theoxidation of aa in a phosphate buffer solution (ph 8.0). the linear range of 0.3 to 20.0?m and a detection limit of 1.43 × 10-7 m were observed in ph 8.0 phosphate buffersolution. also, the modified electrode was employed for the determination of aa in thereal samples such as aa ampoule using standard addition method.