Supported Ionic Liquids Solid-Phase Extraction Coupled to Electrochemical Detection for Determination of Trace Bisphenol A

A simple and green method for the determination of trace bisphenol A (BPA) was established by coupling supported ionic liquid solid-phase extraction to β -cyclodextrin modified ionic liquids carbon paste electrode-based electrochemical detection (SILs-SPE-ED). The synthesized imidazolium ionic liquids modified styrene type macroporous resin was used as adsorbent for SPE of BPA. The experimental parameters that affected the extraction efficiency were investigated and optimized. Dynamic adsorption test showed that the maximum adsorption capacity of BPA on the SILs-SPE cartridge was 10.1 mg g −1 , and the enrichment factor was 40. The calibration curve showed a good linearity between the anodic current and the BPA concentration in the range of 1.0 × 10 −8 −1.0 × 10 −6 M. The detection limit was 4.16 nM (equal to 0.95 μg L −1 ). The SILs-SPE-ED method, with the advantages including high sensitivity and good practicability, was applied to the analysis of real water and plastic samples, and the results agreed well with HPLC method.