In this study, a durable hydrophobicity hydrazone covalent organic framework (BTCH-PTA-COF) has been developed as fiber coating, which was applied to solid-phase microextraction (SPME) of polycyclic aromatic hydrocarbons (PAHs). The hydrophobic and π-π packing interactions between BTCH-PTA-COF and PAHs were confirmed by contact angle experiments and Van der Waals surface electrostatic potential analysis. Further, large specific surface area, good chemical and thermal stability have positive promoting effect on extraction. The method of wide linearity (0.25–300 µg·L−1), low detection limits (0.03–0.05 µg·L−1) and high enrichment factors (767–1411) for the detection of PAHs is explored, coupling BTCH-PTA-COF based SPME with gas chromatography with hydrogen flame detector (GC-FID). The relative standard deviations (RSDs) for inter-day and intra-day extractions of PAHs are ranging from 4.1 % to 9.6 % and 2.9 % to 6.4 %, respectively. The method successfully detected and quantified trace PAHs in tea beverages and river water samples with recoveries from 88.5 % to 104.8 %. The BTCH-PTA-COF coated fiber is ultra-stable in recycled extraction and reused at least 120 times, which could surpass published and commercial SPME fiber.

中文翻译：

---

一种持久疏水性腙共价有机骨架涂层，用于食品和环境样品中多环芳烃的固相微萃取


在这项研究中，开发了一种持久疏水性腙共价有机骨架（BTCH-PTA-COF）作为纤维涂层，应用于多环芳烃（PAH）的固相微萃取（SPME）。通过接触角实验和范德华表面静电势分析证实了BTCH-PTA-COF与PAHs之间的疏水性和π-π堆积相互作用。另外，较大的比表面积、良好的化学和热稳定性对萃取有积极的促进作用。探索了耦合BTCH-PTA的宽线性（0.25–300 µg·L−1）、低检测限（0.03–0.05 µg·L−1）和高富集因子（767–1411）的PAH检测方法-基于 COF 的固相微萃取，采用带氢火焰检测器的气相色谱法 (GC-FID)。 PAH 日间和日内提取的相对标准偏差 (RSD) 范围分别为 4.1% 至 9.6% 和 2.9% 至 6.4%。该方法成功检测并定量了茶饮料和河水样品中的痕量多环芳烃，回收率为88.5%至104.8%。 BTCH-PTA-COF 涂层纤维在回收提取中超稳定，可重复使用至少 120 次，这可能超过已发布和商用的 SPME 纤维。