Zhejiang Provincial Key Laboratory of Watershed Science and Health, College of Public Health and Management, Center for Health Assessment, Wenzhou Medical University, Wenzhou 325035, China.
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
Ecotoxicol Environ Saf. 2021 Oct 1;222:112482. doi: 10.1016/j.ecoenv.2021.112482. Epub 2021 Jul 2.
Herein, a kind of novel multi-layer core-shell nanocomposites (NSPN) was prepared by employing SiO and polyvinylpyrrolidone (PVP) polymers as modifiers and amino-functionalized metal-organic frameworks (NH-MIL101(Fe)) as coating. It was referred to as the NSPN and ILs-based effervescence-assisted dispersive solid-phase microextraction, hereafter abbreviated as NIE-DSM. In terms of extraction efficiency, SiO and PVP as modifiers and NH-MIL(Fe) as coating onto the surface of NiFeO cores played a synergistically enhancing effect on adsorption/extraction. Effervescent tablets were prepared by integrating the NSPN magnetic nanoparticles as adsorbents with imidazolium-based ionic liquids (ILs) as extractants as well as acidic and alkaline sources. Under vigorous dispersion of CO bubbles, the NIE-DSM method realized the goal of rapidly diffusing and separating the adsorbent/extractant (~3 min) without needing conventional vortexing or centrifugation step. Consequently, the NIE-DSM approach combined dispersion and adsorption/extractant in a synchronous way. Under optimized conditions, the NIE-DSM/HPLC-FLD method gave low limits of detection (0.008-0.034 μg kg) and satisfactory extraction recoveries (74.1-101.6%) for five polycyclic aromatic hydrocarbons (PAHs; fluorene, anthracene, pyrene, chrysene and benzo(a)pyrene) in milk samples. The intra-day and inter-day precision, expressed as relative standard deviations, was < 5.9% and 6.5%, respectively, demonstrating a high precision. Owing to no requirement for electrical power, this method shows great potential for outdoor monitoring of trace-level PAHs in food matrices.
本文制备了一种新型的多层核壳纳米复合材料（NSPN），采用 SiO 和聚乙烯吡咯烷酮（PVP）聚合物作为修饰剂，氨基功能化金属有机骨架（NH-MIL101(Fe)）作为涂层。它被称为基于 NSPN 和离子液体（ILs）的冒泡辅助分散固相微萃取，简称 NIE-DSM。就萃取效率而言，SiO 和 PVP 作为修饰剂，NH-MIL(Fe) 作为 NiFeO 核表面的涂层，对吸附/萃取起到协同增强作用。泡腾片是通过将 NSPN 磁性纳米粒子作为吸附剂与咪唑基离子液体（ILs）作为萃取剂以及酸性和碱性源整合而成。在 CO 气泡的剧烈分散下，NIE-DSM 方法实现了快速扩散和分离吸附剂/萃取剂的目标（~3 分钟），无需传统的涡旋或离心步骤。因此，NIE-DSM 方法以同步的方式结合了分散和吸附/萃取。在优化条件下，NIE-DSM/HPLC-FLD 方法对牛奶样品中的五种多环芳烃（PAHs；芴、蒽、芘、䓛和苯并(a)芘）给出了低检测限（0.008-0.034μgkg）和令人满意的萃取回收率（74.1-101.6%）。日内和日间精密度分别表示为相对标准偏差，<5.9%和 6.5%，表明精密度高。由于不需要电力，该方法在食品基质中痕量 PAHs 的户外监测方面具有很大的潜力。
