AbstractA novel covalent organic framework based magnetic adsorbent was developed for magnetic solid phase extraction (MSPE) of polycyclic aromatic hydrocarbons (PAHs). Covalent organic framework-LZU1 (= Lan Zhou University-1) was covalently immobilized onto polyethyleneimine-functionalized magnetic nanoparticles (COF-LZU1@PEI@Fe3O4), and the resulting material was characterized by transmission electron microscopy and Fourier transform infrared spectroscopy. The effects of the pH value of sample solution, percentage of acetonitrile, extraction time and sampling volume on MSPE of six PAHs were investigated. The COF-LZU1@PEI@Fe3O4 displays high extraction efficiency for the PAHs such as pyrene, benzo[a]pyrene, fluoranthene, benz[a]anthracene, benzo[a]fluorathene and dibenz[a,h]anthracene. Following desorption with acetonitrile, the PAHs were quantified by HPLC. The MSPE-HPLC method shows low limit of detection (0.2–20 pg mL−1), wide linear range and good reproducibility (relative standard deviations <4.4% for intra-day and inter-day precision). The method was successfully applied to determine PAHs in environmental samples. Good recoveries were obtained, ranging from 90.9 to 107.8% for water samples and 85.1 to 105.0% for soil samples. Graphical abstractSchematic of the preparation of magnetic nanoparticles modified with a covalent organic framework (COF-LZU1) for extraction of polycyclic aromatic hydrocarbons prior to quantitation by HPLC. PEI: Polyethyleneimine.

中文翻译：

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基于共价有机骨架的磁性吸附剂，用于多环芳烃的固相萃取，并与 HPLC 联用进行定量

摘要 开发了一种基于共价有机骨架的新型磁性吸附剂，用于多环芳烃（PAHs）的磁性固相萃取（MSPE）。共价有机骨架-LZU1（=兰州大学-1）共价固定在聚乙烯亚胺功能化磁性纳米粒子（COF-LZU1@PEI@Fe3O4）上，所得材料通过透射电子显微镜和傅里叶变换红外光谱进行表征。考察了样品溶液的 pH 值、乙腈的百分比、萃取时间和采样体积对六种多环芳烃 MSPE 的影响。COF-LZU1@PEI@Fe3O4对芘、苯并[a]芘、荧蒽、苯并[a]蒽、苯并[a]芴和二苯并[a,h]蒽等多环芳烃具有高提取效率。用乙腈解吸后，多环芳烃通过 HPLC 定量。MSPE-HPLC 方法显示出低检测限 (0.2–20 pg mL-1)、宽线性范围和良好的重现性（日内和日间精密度的相对标准偏差 <4.4%）。该方法已成功应用于环境样品中多环芳烃的测定。获得了良好的回收率，水样回收率为 90.9% 至 107.8%，土壤样品回收率为 85.1% 至 105.0%。用共价有机骨架 (COF-LZU1) 修饰的磁性纳米粒子的制备示意图，用于在 HPLC 定量之前提取多环芳烃。PEI：聚乙烯亚胺。该方法已成功应用于环境样品中多环芳烃的测定。获得了良好的回收率，水样回收率为 90.9% 至 107.8%，土壤样品回收率为 85.1% 至 105.0%。用共价有机骨架 (COF-LZU1) 修饰的磁性纳米粒子的制备示意图，用于在 HPLC 定量之前提取多环芳烃。PEI：聚乙烯亚胺。该方法已成功应用于环境样品中多环芳烃的测定。获得了良好的回收率，水样回收率为 90.9% 至 107.8%，土壤样品回收率为 85.1% 至 105.0%。用共价有机骨架 (COF-LZU1) 修饰的磁性纳米粒子的制备示意图，用于在 HPLC 定量之前提取多环芳烃。PEI：聚乙烯亚胺。