title: Disposable ionic liquid coating for headspace solid-phase microextraction of benzene, toluene, ethylbenzene, and xylenes in paints followed by gas chromatography-flame ionization detection.
abstract: Solid-phase microextraction (SPME) with a disposable ionic liquid (IL) coating was developed for headspace extraction of benzene, toluene, ethylbenzene, and xylenes (BTEX) in paints. The SPME fiber was coated with IL prior to every extraction, then the analytes were extracted and desorbed on the injection port of gas chromatography, and finally the IL coating on the fiber was washed out with solvents. The coating and washing out of IL from the fiber can be finished in a few minutes. This disposable IL-coated fiber was applied to determine BTEX in water-soluble paints with results in good agreement with that obtained by using commercially available SPME fibers. For all the four studied paints samples, the benzene contents were under the detection limits, but relatively high contents of toluene, ethylbenzene and xylenes (56-271 microg g(-1)) were detected with spiked recoveries in the range of 70-114%. Compared to the widely used commercially available SPME fibers, this proposed disposable IL-coated fiber has much lower cost per determination, comparable reproducibility (RSD < 11%), and no carryover between each determination. Considering that IL possess good extractability for various organic compounds and metals ions, and that task-specific IL can be designed and synthesized for selective extraction of target analytes, this disposable IL coating SPME might has great potential in sample preparation.
authors.affiliation: Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China.
authors.forename: Jing-Fu
authors.initials: JF
authors.lastname: Liu
authors.forename: Ning
authors.initials: N
authors.lastname: Li
authors.forename: Gui-bin
authors.initials: GB
authors.lastname: Jiang
authors.forename: Jie-min
authors.initials: JM
authors.lastname: Liu
authors.forename: Jan Ake
authors.initials: JA
authors.lastname: Jönsson
authors.forename: Mei-juan
authors.initials: MJ
authors.lastname: Wen
mesh_terms: D001554:Benzene / Q000032:analysis*; D001555:Benzene Derivatives / Q000032:analysis*; D002849:Chromatography, Gas / Q000379:methods*; D007202:Indicators and Reagents; D016014:Linear Models; D010150:Paint / Q000032:analysis*; D012680:Sensitivity and Specificity; D012996:Solutions; D013696:Temperature; D013997:Time Factors; D014050:Toluene / Q000032:analysis*; D014992:Xylenes / Q000032:analysis*
chemical_list: D001555:Benzene Derivatives; D007202:Indicators and Reagents; D012996:Solutions; D014992:Xylenes; D014050:Toluene; D001554:Benzene; C004912:ethylbenzene