Voltammetric determination of bisphenol A using modified carbon paste electrode

ABSTRACT

Designing effective and accurate methods to determine bisphenol A (BPA) residues is crucial for safeguarding food safety and preserving the environment. The main objective of the present work is to develop a simple and sensitive electrochemical sensor to detect BPA based on a modified carbon paste electrode (CPE). For this, CeO₂ nanoparticles (CeO₂ NPs) and ionic liquid (IL) were used to modify CPE. Cyclic voltammetry (CV) was utilised as the technique to investigate the electrochemical behaviour of BPA at the surface of various electrodes (unmodified CPE, CeO₂ NPs/CPE, ILCPE, and CeO₂ NPs/ILCPE). The obtained result showed that the CeO₂ NPs/ILCPE exhibited better electrocatalytic performance to BPA oxidation than that observed at other CPEs. For quantification of BPA, differential pulse voltammetry (DPV) was utilised. Under the optimum detection conditions, the CeO₂ NPs/ILCPE sensor showed good linearity in the detection of BPA within range 0.02–460.0 µM with a limit of detection (LOD) of 0.01 µM. Finally, the enhanced electrochemical response from CeO₂ NPs/IL-modified CPE towards BPA has been used to evaluate the practical application of this sensor. The obtained results (recovery and relative standard deviation (RSD) values) confirmed the applicability of the modified CPE to detect BPA in real samples. Based on the findings, the CeO₂ NPs/ILCPE sensor appears to be a suitable platform for BPA determination.

KEYWORDS:

• Bisphenol A
• electrochemical sensor
• carbon paste electrode
• CeO₂ nanoparticles
• ionic liquid

Disclosure statement

No potential conflict of interest was reported by the author(s).