Voltammetric determination of bisphenol a using an acetylene black-dihexadecyl hydrogen phosphate composite film-modified electrode

Herein, acetylene black (AB) was easily dispersed into water in the presence of dihexadecyl hydrogen phosphate (DHP), resulting in a stable and homogeneous AB-DHP suspension. Then, an AB-DHP composite film coated glassy carbon electrode (GCE) was constructed after evaporation of water. The electrochemical behavior of bisphenol A was investigated using cyclic voltammetry (CV), linear sweep voltammetry (LSV), and differential pulse voltammetry (DPV). Compared with the unmodified GCE, the AB-DHP film-modified GCE not only significantly enhances the oxidation peak current of bisphenol A but also lowers the oxidation overpotential, suggesting that AB-DHP film-modified GCE has great potential in sensitive determination of bisphenol A. Based on this, a sensitive and simple electrochemical method was developed after optimization of the experimental parameters such as supporting electrolyte, the amount of AB-DHP, scan rate, and accumulation time. The linearity is over the range form 2.0 x 10(-8) to 5.0 x 10(-6) mol l(-1), and the detection limit is 6.0 x 10(-9) mol l(-1). Finally, this method was successfully employed to determine bisphenol A in waste water samples.