title: Insight into the extraction mechanism of polymeric ionic liquid sorbent coatings in solid-phase microextraction.
abstract: An investigation into the mechanism of extraction for polymeric ionic liquid (PIL)-based solid phase microextraction sorbent coatings is described. Four PIL-based coatings, namely, a poly(1-4-vinylbenzyl)-3-hexadecylimidazolium bis[(trifluoromethyl)sulfonyl] imide (poly([VBHDIM][NTf2])) PIL produced through 2,2'-azo-bis(isobutyronitrile) (AIBN) initiated free-radical polymerization, a UV-initiated poly(1-vinyl-3-hexylimidazolium) chloride (poly([VHIM][Cl])) PIL, and two crosslinked PILs containing the same IL monomers copolymerized with dicationic IL crosslinkers, were investigated. Calibration curves of 1-octanol were plotted in the presence of naphthalene, a model interfering compound, to observe changes in the linear range, sensitivity, and amount of analytes extracted. Results were compared with a polydimethylsiloxane/divinylbenzene (PDMS/DVB) coating and a polyacrylate (PA) coating which are known to extract analytes primarily through adsorption and partitioning mechanisms, respectively. All PIL-based coatings extracted analytes via a non-competitive partitioning mechanism regardless of the extent of crosslinking.
authors.affiliation: Department of Chemistry, The University of Toledo, Toledo, OH 43606, USA.
authors.forename: Tien D
authors.initials: TD
authors.lastname: Ho
authors.forename: William T S
authors.initials: WT
authors.lastname: Cole
authors.forename: Fabio
authors.initials: F
authors.lastname: Augusto
authors.forename: Jared L
authors.initials: JL
authors.lastname: Anderson
mesh_terms: D000327:Adsorption; D052578:Ionic Liquids / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D052617:Solid Phase Microextraction / Q000379:methods*
chemical_list: D052578:Ionic Liquids; D011108:Polymers