title: Anodic voltammetric study of ascorbic Acid at platinum and gold rotating disc electrodes.
abstract: Anodic Voltammetry of ascorbic acid at platinum and gold rotating disc electrodes has been examined in acidic and alkaline media. Ascorbic acid is oxidised by a single two electron wave at platinum and one electron two step at gold electrode. The best medium for electroanalysis is 0.1 mol 1(-1) sulphuric acid in which it shows obedience to the Levich relationship at both electrodes. The limiting current is linearly proportional to ascorbic acid concentration with Zero intercept and shows excellent rapid voltammetric determination. Electrode Kinetic parameters for mass and charge transfer have been determined. Voltammetric method has been used to determine the number of electrons involved in the reaction and the reaction mechanism has been elucidated.
authors.affiliation: Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Karachi, Karachi-75270, Pakistan.
authors.forename: W
authors.initials: W
authors.lastname: Hussain
authors.forename: D
authors.initials: D
authors.lastname: Waqar
authors.forename: M
authors.initials: M
authors.lastname: Alam
mesh_terms: D000143:Acids; D001205:Ascorbic Acid; D004563:Electrochemistry; D004566:Electrodes; D006046:Gold; D010984:Platinum
chemical_list: D000143:Acids; D010984:Platinum; D006046:Gold; D001205:Ascorbic Acid