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金属有机框架MIL-101(Cr)涂层固相微萃取纤维的制备与表征

Preparation and characterization of metal-organic framework MIL-101(Cr)-coated solid-phase microextraction fiber.

作者信息

Xie Lijun, Liu Shuqin, Han Zhubing, Jiang Ruifen, Liu Hong, Zhu Fang, Zeng Feng, Su Chengyong, Ouyang Gangfeng

机构信息

MOE Key Laboratory of Aquatic Product Safety/KLGHEI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China.

MOE Key Laboratory of Aquatic Product Safety/KLGHEI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China.

出版信息

Anal Chim Acta. 2015 Jan 1;853:303-310. doi: 10.1016/j.aca.2014.09.048. Epub 2014 Oct 8.

Abstract

Metal-organic frameworks (MOFs) have received great attention as novel sorbents due to their fascinating structures and intriguing potential applications in various fields. In this work, a MIL-101(Cr)-coated solid-phase microextraction (SPME) fiber was fabricated by a simple direct coating method and applied to the determination of volatile compounds (BTEX, benzene, toluene, ethylbenzene, m-xylene and o-xylene) and semi-volatile compounds (PAHs, polycyclic aromatic hydrocarbons) from water samples. The extraction and desorption conditions of headspace SPME (HS-SPME) were optimized. Under the optimized conditions, the established methods exhibited excellent extraction performance. Good precision (<7.7%) and low detection limits (0.32-1.7 ng L(-1) and 0.12-2.1 ng L(-1) for BTEX and PAHs, respectively) were achieved. In addition, the MIL-101(Cr)-coated fiber possessed good thermal stability, and the fiber can be reused over 150 times. The fiber was successfully applied to the analysis of BTEX and PAHs in river water by coupling with gas chromatography-mass spectrometry (GC-MS). The analytes at low concentrations (1.7 and 10 ng L(-1)) were detected, and the recoveries obtained with the spiked river water samples were in the range of 80.0-113% and 84.8-106% for BTEX and PAHs, respectively, which demonstrated the applicability of the self-made fiber.

摘要

金属有机框架材料(MOFs)因其迷人的结构以及在各个领域的潜在应用而备受关注,成为新型吸附剂。在本研究中,采用简单的直接涂覆法制备了MIL-101(Cr)涂层的固相微萃取(SPME)纤维,并将其应用于测定水样中的挥发性化合物(BTEX,即苯、甲苯、乙苯、间二甲苯和邻二甲苯)和半挥发性化合物(PAHs,即多环芳烃)。对顶空固相微萃取(HS-SPME)的萃取和解吸条件进行了优化。在优化条件下,所建立的方法表现出优异的萃取性能。实现了良好的精密度(<7.7%)和低检测限(BTEX和PAHs的检测限分别为0.32 - 1.7 ng L⁻¹和0.12 - 2.1 ng L⁻¹)。此外,MIL-101(Cr)涂层纤维具有良好的热稳定性,可重复使用150次以上。通过与气相色谱 - 质谱联用(GC-MS),该纤维成功应用于河水样品中BTEX和PAHs的分析。检测到了低浓度(1.7和10 ng L⁻¹)的分析物,加标河水样品中BTEX和PAHs的回收率分别在80.0 - 113%和84.8 - 106%范围内,这证明了自制纤维的适用性。

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