In this work, electro-enhanced solid-phase microextraction (EE-SPME) and covalent organic framework (COF) were adopted to improve the extraction efficiency. A conductive COF synthesized of 2,6-diaminoanthraquinone (DQ) and 1,3,5-triformylphloroglucinol (TP) was in situ bonded to the stainless steel wire via facile solution-phase approach and used as the EE-SPME fiber coating to preconcentrate a typical endocrine disruptor bisphenol A (BPA). Compared with conventional SPME, the DQTP bonded fiber coupled with EE-SPME device exhibited higher extraction efficiency and achieved extraction equilibrium within 10 min. The proposed approach based on EE-SPME and gas chromatography coupled with flame ionization detector gave a linear range of 0.05-10 μg mL-1 and detection limit of 3 μg L-1 (S/N = 3) with good precision (<6.7%) and reproducibility (<7.1%) spiked with 0.1, 0.5, 1.0 μg mL-1 BPA. Quantitative determination of BPA in extracts of food packagings (mineral water bottles, milk boxes and milk tea cups) was achieved with recoveries from 88.6 to 118.0%.

中文翻译：

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共价有机骨架改性不锈钢纤维电增强固相微萃取高效吸附双酚A

在这项工作中，采用电增强固相微萃取（EE-SPME）和共价有机骨架（COF）来提高萃取效率。由 2,6-二氨基蒽醌 (DQ) 和 1,3,5-三甲酰基间苯三酚 (TP) 合成的导电 COF 通过简便的液相方法原位键合到不锈钢丝上，并用作 EE-SPME 纤维涂层以进行预浓缩典型的内分泌干扰物双酚 A (BPA)。与传统的 SPME 相比，DQTP 粘合纤维与 EE-SPME 装置结合具有更高的提取效率，并在 10 分钟内达到提取平衡。所提出的基于 EE-SPME 和气相色谱结合火焰离子化检测器的方法提供了 0.05-10 μg mL-1 的线性范围和 3 μg L-1 (S/N = 3) 的检测限，具有良好的精度 (<6.7 %) 和重现性 (<7. 1%) 加入 0.1、0.5、1.0 μg mL-1 BPA。实现了食品包装（矿泉水瓶、牛奶盒和奶茶杯）提取物中 BPA 的定量测定，回收率为 88.6% 至 118.0%。