CdTe Quantum Dots Modified Carbon Paste Electrode for Voltammetric Determination of Ascorbic Acid

A novel CdTe quantum dots is synthesized and used for modification of carbon paste electrode (QDMCPE). This modified electrode was used to study the electrooxidation of ascorbic acid using cyclic voltammetry (CV), square wave voltammetry (SWV) and chronoamperometry (CHA) as diagnostic techniques. SWV peak currents of ascorbic acid increased linearly with its concentrations in the range of 5.0×10-7-8.0×10-4 M with a detection limit of 3.0×10−7 M. The main objectives of QDMCPE for determination of ascorbic acid are: wide linear dynamic range, short time of the procedure and no use of electron transfer mediator.Finally this new sensor was used for determination of ascorbic acid in some real samples.