期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1214, 期 1-2, 页码 23-29出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2008.10.084
关键词
Ionic liquids; Aggregates; Solid-phase microextraction; Gas chromatography-mass spectrometry; Focused microwave-assisted extraction; Polycyclic aromatic hydrocarbons; Sediment samples
资金
- Servicio de Medioambiente de la Universidad de La Laguna (SEMALL)
- Spanish Ministry of Innovation and Science [CTQ2007-67084/BQU, CTQ2008-06253/BQU]
- National Science Foundation for a CAREER [CHE-0748612]
Three ionic liquid (IL)-based aggregates, 1-hexadecyl-3-methylimidazolium bromide (HDMIm-Br), 1-hexadecyl-3-butylimidazolium bromide (HDBIm-Br), and 1,3-didodecylimidazolium bromide (DDDDIm-Br) have been applied to the development of a quantitative solid-phase microextraction (SPME)-gas chromatography (GC)-mass spectrometry (MS) method. A sensitivity factor (SF) is defined and introduced for the first time to quantitatively compare the efficiency of the IL-based aggregates by SPME-GC-MS and to evaluate the partitioning strength of several polycyclic aromatic hydrocarbons (PAHs) to the three IL-aggregates. The Its HDBIm-Br and HDMIm-Br have been used successfully to extract seven PAHs from the certified reference sediment BCR-535 using focused microwave-assisted extraction followed by SPME-GC-MS. Average recoveries for six of the seven certified PAHs were 84.6% for HDMIm-Br and 101% for HDBIm-Br, with relative standard deviation values (RSDs) lower than 19%. The overall extraction method requires short extraction times (around 7 min for the microwave step) and avoids the use of organic solvents. (c) 2008 Elsevier B.V. All rights reserved.
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