Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1344, Issue -, Pages 15-22Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2014.04.013
Keywords
Ionic liquid; Polymeric ionic liquids; Multi-walled carbon nanotubes; Solid-phase microextraction; Polycyclic aromatic hydrocarbons; Gas chromatography
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Novel cross-linked polymeric ionic liquid (PIL) bucky gels were formed by free-radical polymerization of polymerizable ionic liquids gelled with multi-walled carbon nanotubes (MWCNT) and used as sorbent coatings for solid-phase microextraction (SPME). The combination of PIL with MWCNTs significantly enhanced the pi-pi interaction between the sorbent coatings and the aromatic analytes. Compared to the neat PIL-based sorbent coating, the PIL bucky gel sorbent coatings demonstrated higher extraction efficiency for the extraction of polycyclic aromatic hydrocarbons (PAHs). A partitioning extraction mechanism was observed for the PIL/MWCNT-based sorbent coatings indicating that the addition of MWCNTs did not seem to affect the extraction mechanism of the sorbent coating. The analyte-to-coating partition coefficients (log K-fs) were estimated and the limits of detection (LOD) for selected PIL bucky gel sorbent coating were determined to be in the range of 1-2.5 ng L-1. Recovery studies were also performed for PAHs in river and tap water to validate the applicability of the developed method. (C) 2014 Elsevier B.V. All rights reserved.
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