A silica-based network was used to immobilize ionic liquid-based ionogels and applied as a fiber coating forsolid-phase microextraction (SPME). The ionogels were prepared by a sol–gel process, using two ionic liquids,triethylsulfonium bis(trifluoromethylsulfonyl)imide ([Set3][TFSI]) and 1-butyl-1-methylpiperidinium bis(tri-fluoromethylsulfonyl)imide ([C4C1Pip][TFSI]), as well as their equimolar mixture. Methyltrimethoxysilane wasused as the sol–gel precursor, and trifluoroacetic acid as a reaction catalyst.The fabricated ionogel fibers were evaluated as sorbent coating in headspace SPME combined with gaschromatography with barrier ionization discharge detection for volatile organic compounds (VOCs). The fibersshowed a high affinity to aromatic VOCs, yielding good sensitivity and precision. Then, the developed methodwas applied to the analysis of aqueous samples.During the study, the main extraction parameters, i.e., salt concentration, extraction time, and temperature,were optimized for maximum fiber sorption and to maximize the enrichment factors. The average limits ofdetection were found to be 0.15 μg L−1, 0.40 μg L−1, and 0.07 μg L−1, and the enrichment factors were in the25700–61000, 33200–84700, and 29100–96500 ranges for [Set3], [C4C1Pip] and [Set3/C4C1Pip], respectively.The single fiber and fiber-to-fiber reproducibilities were below 11.2% and 30.6%, respectively. The results of thiswork suggest the possibility of fabricating selected extractants based on the physicochemical properties of theionic liquids and target analytes.
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Additional information
- DOI
- Digital Object Identifier link open in new tab 10.1016/j.seppur.2020.116988
- Category
- Publikacja w czasopiśmie
- Type
- artykuły w czasopismach
- Language
- angielski
- Publication year
- 2020
