Abstract:

In this work, a 1-cyanoethyl-3-methylimidazolium hexafluorophosphate (CMIMPF6) modified ionic liquid
carbon paste electrode (ILCPE) was fabricated. The electrochemical behavior of bisphenol A (BPA) at the ILCPE electrode
was studied in detail. In 0.1 mol/L B-R buffer solution (pH 10.0), a well-defined anodic peak was produced at 0.415 V.
The ILCPE electrode showed good catalytic activity and sensitizing effect on the oxidation of BPA in the B-R solution.
The investigation of the electrode process indicated that the electrochemical oxidation of BPA was an irreversible
process with a controlled adsorption, and that protons participated in the electrode reaction process. The corresponding
electrochemical rate constant (ks) was 0.32/s. The limit of detection and the linear range of BPA concentration against
oxidation peek current were 5.0×10-8 mol/L (RSN = 3) and 3.0×10-7 –6.0×10-5 mol/L, respectively. Differential
pulse voltammetry has been applied to the determination of microamounts of BPA in feeding bottle samples with
satisfactory results.

Key words: ionic liquid, chemically modified electrode, bisphenol A, food detection