A novel and sensitive electrochemical sensor for bisphenol A determination based on carbon black supporting ferroferric oxide nanoparticles

A novel and sensitive electrochemical sensor for bisphenol A (BPA) determination based on carbon black supporting ferroferric oxide nanoparticles (Fe3O4NPs-CB) was developed. The Fe3O4NPs-CB nanocomposite fabricated on the glassy carbon electrode (GCE) demonstrated a high electrocatalytic activity towards the oxidation of BPA. The oxidation overpotentials of BPA decreased significantly and the peak current increased greatly compared with those of Fe3O4NPs- or CB-modified or bare GCE. Differential pulse voltammetry (DPV) was used as a sensitive analytical method for the determination of BPA, and a much wider linear dynamic range of BPA determination was found between 0.1 nM and 50 μM. The limit of detection (LOD) for BPA was found down to 0.031 nM based on S/N = 3. Fabricated Fe3O4NPs-CB nanocomposite on GCE displayed several outstanding properties such as good stability, high sensitivity and remarkable repeatability. The described sensor has been used for the determination of BPA in water samples with good recovery, ranging from 93.2% to 104.1%. Additionally, the migration of BPA from PC drinking bottles was evaluated by using water to simulate migration into aqueous and acidic foods.