Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1623, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.chroma.2020.461197
Keywords
Covalent organic framework; Solid-phase microextraction; Per-and polyfluorinated alkyl substances; Fluorine affinity; Room temperature
Funding
- National Natural Science Foundation of China [31972145]
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Trifluoromethyl covalent organic framework (CF3-COF) is facilely synthesized at room temperature using for solid-phase microextraction (SPME). The CF3-COF coating displays an improved extraction performance for per- and polyfluorinated alkyl substances (PFASs) comparing to amorphous polymer coating, non-contained fluorine covalent organic framework coating and commercially available SPME coating. The fluorine affinity of trifluoromethyl in CF3-COF for PFASs is demonstrated using the density functional theory calculation. Following the microextraction with CF3-COF-coated fiber, the targeted PFASs are eluted with 1 mL acetonitrile and quantified by ultrahigh performance liquid chromatography tandem mass spectrometry. The low limits of detection are 0.1-0.7 pg g(-1) for milk and 0.2-0.8 pg g(-1) for milk powder, suggesting the outstanding sensitivity. The precision for the method ranges between 2.9 and 9.9%. The fiber-to-fiber repeatability is in the range of 4.2-9.5%. Under the optimum conditions, the relative recoveries are 91.0-110% with RSDs <= 10% for milk and 89.8-111% with RSDs <= 10% for milk powder. (C) 2020 Elsevier B.V. All rights reserved.
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