固定化离子液体固相萃取-电化学联用测定痕量双酚A

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

以咪唑改性的苯乙烯型大孔树脂填料制备固相萃取小柱,进行固定化离子液体固相萃取,结合β-环糊精修饰离子液体碳糊电极,发展痕量双酚A的电化学联用快速检测技术。实验优化影响萃取效率的因素,获得最佳萃取条件（萃取填料用量0.4 g,样品体积200 m L,上样液p H 7.0,5 m L甲醇为洗脱溶剂,萃取流速4.5 m L/min）。测得固定化离子液体树脂对双酚A的最大吸附容量为10.1 mg/g,富集倍数为40倍。双酚A的浓度线性范围在2.3-228μg/L,检出限为0.95μg/L。联用方法灵敏、实用性强,用于实际样品中双酚A分析,结果与HPLC方法一致。

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 liquid carbon paste electrode-based electrochemical detection（ SILs-SPE-ED）. The synthesized imidazolium ionic liquid modified styrene type macroporous resin was used as adsorbent for SPE of BPA. The critical parameters that affect the extraction efficiency were optimized,including 0. 4 g of packing material quantity,200 m L of sample solution at p H 7. 0,5 m L of methanol as an eluent solvent,and 4. 5 m L / min of the SPE flow rate. Dynamic adsorption test showed that the maximum adsorption capacity of BPA on the SILs-SPE cartridge was 10. 1 mg / g,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^-6mol / L（ i. e. 2. 3-228 μg / L）. The detection limit was4. 16 ×10^-9mol / L（ equal to 0. 95 μg / L）. The SILs-SPE-ED method was applied to the analysis of water and plastic samples and the results agreed well with HPLC method.