Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1210, Issue 1, Pages 19-24Publisher
ELSEVIER
DOI: 10.1016/j.chroma.2008.09.040
Keywords
Microextraction; Environmental analysis; Rainwater and three-phase liquid-phase microextraction
Funding
- Agency for Science, Technology and Research of Singapore
- National University of Singapore [R-143-000-303-112]
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For the first time hollow fiber-protected ionic liquid supported three-phase (liquid-liquid-liquid) microextraction (HFM-LLLME) was developed for the gas chromatography-mass spectrometric (CC-MS) analysis of aromatic and aliphatic hydrocarbons. The hydrocarbons were extracted from 10m I of aqueous samples though small volumes of ionic liquid and organic solvent in the hollow fiber membrane HFM) wall and channel, respectively. The ionic liquid was immiscible with both the aqueous sample and the organic solvent (toluene). After extraction, the enriched solvent was directly injected into a GC-MS system for analysis without any further pretreatment. Ionic liquid supported HFM-LLLME shows better extraction performance than two-phase HFM-liquid-phase microextraction, in which only organic solvent is involved, and solid-phase microextraction. The ionic liquid and organic solvent combination found most suitable for HFM-LLLME was 1 -butyl-3-methylimidazolium hexafluorophosphate, and toluene, respectively. This new technique provided up to 210-fold enrichment of aliphatic and aromatic hydrocarbons in 40 min with good reproducibility (<11 %) and limits of detection (1-7 ng 1(-1)). (c) 2008 Elsevier B.V. All rights reserved.
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