聚二甲基硅氧烷/金属有机框架包覆纤维用于河流和湖泊水样中多环芳烃的固相微萃取

Polydimethylsiloxane/metal-organic frameworks coated fiber for solid-phase microextraction of polycyclic aromatic hydrocarbons in river and lake water samples.

作者信息

Zhang Guijiang, Zang Xiaohuan, Li Zhi, Wang Chun, Wang Zhi

机构信息

Department of Chemistry, College of Science, Agricultural University of Hebei, Baoding 071001, China.

Department of Chemistry, College of Science, Agricultural University of Hebei, Baoding 071001, China.

出版信息

Talanta. 2014 Nov;129:600-5. doi: 10.1016/j.talanta.2014.06.013. Epub 2014 Jun 17.

Abstract

In this study, polydimethylsiloxane/metal-organic frameworks (PDMS/MOFs), including PDMS/MIL-101 and PDMS/MOF-199, were immobilized onto a stainless steel wire through sol-gel technique as solid-phase microextraction (SPME) fiber coating. The prepared fibers were used for the extraction of some polycyclic aromatic hydrocarbons (PAHs) from water samples prior to gas chromatography-mass spectrometry (GC-MS) analysis. Under the optimized experiment conditions, the PDMS/MIL-101 coated fiber exhibited higher extraction efficiency towards PAHs than that of PDMS/MOF-199. Several parameters affecting the extraction of PAHs by SPME with PDMS/MIL-101 fiber, including the extraction temperature, extraction time, sample volume, salt addition and desorption conditions, were investigated. The limits of detection (LODs) were less than 4.0 ng L(-1) and the linearity was observed in the range from 0.01 to 2.0 µg L(-1) with the correlation coefficients (r) ranging from 0.9940 to 0.9986. The recoveries of the method for the PAHs from water samples at spiking levels of 0.05 and 0.2 µg L(-1) ranged from 78.2% to 110.3%. Single fiber repeatability and fiber-to-fiber reproducibility were less than 9.3% and 13.8%, respectively.

摘要

在本研究中,通过溶胶 - 凝胶技术将聚二甲基硅氧烷/金属有机框架(PDMS/MOFs),包括PDMS/MIL - 101和PDMS/MOF - 199,固定在不锈钢丝上作为固相微萃取(SPME)纤维涂层。制备的纤维用于在气相色谱 - 质谱(GC - MS)分析之前从水样中萃取一些多环芳烃(PAHs)。在优化的实验条件下,PDMS/MIL - 101涂层纤维对PAHs的萃取效率高于PDMS/MOF - 199。研究了影响用PDMS/MIL - 101纤维进行SPME萃取PAHs的几个参数,包括萃取温度、萃取时间、样品体积、加盐量和解吸条件。检测限(LODs)小于4.0 ng L⁻¹,在0.01至2.0 µg L⁻¹范围内观察到线性,相关系数(r)在0.9940至0.9986之间。该方法对加标水平为0.05和0.2 µg L⁻¹的水样中PAHs的回收率在78.2%至110.3%之间。单纤维重复性和纤维间重现性分别小于9.3%和13.8%。

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