A water resistant solid-phase microextraction fiber with high selectivity prepared by a metal organic framework with perfluorinated pores

作者：Niu, Jiajia; Li, Zhongyue^*; Yang, Huijuan; Ye, Changwen; Chen, Chen; Li, Dong; Xu, Jun; Fan, Li^*

来源：Journal of Chromatography A, 2016, 1441: 16-23.

DOI：10.1016/j.chroma.2016.02.076

• Solid-phase microextraction
• Metal organic framework
• Selective extraction
• Fluorine-lined
• Hydrophobic

A novel solid-phase microextraction (SPME) fiber was fabricated by the construction of fluorous metal organic frameworks (FMOF) and a polyimide (PI) composite strategy. As an auxiliary material, PI was expected to help FMOF particles form well-knit film on the surface of stainless steel wire and reinforce the coating, and FMOF was expected to afford a special structure to absorb, extract and enrich. Furthermore, it was explored for the headspace SPME (HS-SPME) of six volatile aromatic compounds (VACs) from water samples followed by gas chromatographic (GC) separation with flame ionization detection. Under the optimized conditions, the fiber afforded wide linear ranges (1-1000 mu g L-1), low detection limits (0.15-0.9 mu gL(-1)) and acceptable repeatability (<4.6%) and reproducibility (<7.3%). The FMOF@PI coated fiber not only offered large enhancement factors for benzene (1227) but also exhibited high extraction selectivity for benzene to other benzene homologues, hydrocarbons and phenols; for example, the extraction ratio of benzene to toluene, n-hexane and phenol could be as high as 10.2, 64.1 and 32.3, respectively. Moreover, the FMOF@PI-coated fiber afforded good thermal, water and organic solvent stabilities, and a long lifetime (over 200 times). The developed method was successfully applied to the determination of VACs in wastewater samples.

• 出版日期2016-4-8
• 单位河南理工大学; 中国烟草总公司郑州烟草研究院