Determination of Ascorbic Acid by Electrochemical Sensor Based on Graphene
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Abstract:
A graphene modified electrode was prepared to establish an electrochemical method for the determination of ascorbic acid. The graphene modified electrode (ERGO/GCE) was prepared by one-step electrodeposition using electrochemical reduction technique. Electrochemical behavior of ascorbic acid (ascorbic acid, AA) on the modified electrode was investigated by cyclic voltammetry (cyclic voltammetry, CV). The results showed that the as-prepared graphene modified electrode had obvious electrocatalytic effect against ascorbic acid. In the phosphate buffer solution with ph=6.5, AA has an irreversible oxidation peak in the range of -0.4~0.8 V scanning potential. Under the optimized experimental conditions, the concentration of AA is linearly related to its oxidation peak current in the range of 1.1×10-3 mol/L~2×10-5 mol/L, the correlation coefficient was 0.991, and the lowest detection limit was 9×10-6 mol/L (S/N 3). The stability and anti-interference of the modified electrode were investigated. The results showed that the electrode had good stability and strong anti-interference ability. The content of AA in fruit orange beverage was detected by modified electrode, and the recovery rate was between 97.95%~98.68%. Electrochemical method established in this paper can be used for the determination of AA in orange juice, and the results are satisfactory.
