Abstract
The irreversible, diffusion controlled behavior of gallic acid (GA) on a Bi2O3/Gr modified glassy carbon electrode (Bi2O3/Gr/GCE) was established by Square Wave Voltammetry (SWV). The fabrication of the electrode was done by the drop-casting method and characterized by various techniques viz scanning electron microscopy-Energy dispersive X-ray (SEM-EDX), X-ray diffraction (XRD) and Electrochemical impedance spectroscopy (EIS). Using the anodic oxidation peak presented by GA on the Bi2O3/Gr/GCE, a Square Wave Voltammetry (SWV) method was developed for the quantitative determination of GA. The linear range was 0.5-4.5 nM GA and the detection and quantification limits were 0.08 nM and 0.24 nM GA, respectively. The applicability of the developed method was tested on black tea leaves, which was found to be 7.26 μg/mL gallic acid equivalent/g dry tea, respectively. The developed method is a sensitive and cheap tool for the rapid and precise evaluation of GA of tea samples.
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