An Electrochemical Sensor Based on Bimetallic PtPd Nanoparticles for the Determination of Bisphenol A

Abstract

As a chemical compound with low toxicity, bisphenol A (BPA) mimics oestrogen activity, which can induce precocious puberty. Herein, a sensitive electrochemical sensor is constructed for BPA detection based on flower-like bimetallic PtPd nanoparticles, which are synthesized by a microwave-assisted hydrothermal method. After characterization by transmission electron microscopy (TEM), the electrochemical behaviour of BPA on a PtPd nanoparticle-modified glassy carbon electrode (PtPd/GCE) is studied by electrochemical tests, including cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV). Under optimal conditions, the electrochemical response of BPA on PtPd/GCE is linear, with BPA concentrations ranging from 0.75 μM to 600 μM and a detection limit of 132 nM. Due to the high sensitivity and stability of this sensor, it is used to detect BPA in both food and beverage containers with satisfactory recoveries and acceptable relative standard deviations.