Analytical and Bioanalytical Chemistry

, Volume 392, Issue 7–8, pp 1271–1275 | Cite as

Determination of ethanol in ionic liquids using headspace solid-phase microextraction–gas chromatography

  • Fei Zhao
  • Thehazhnan K. Ponnaiyan
  • Christa M. Graham
  • Constance A. Schall
  • Sasidhar Varanasi
  • Jared L. Anderson
Short Communication

Abstract

The application of ionic liquids (ILs) as nonderivatizing solvents for the pretreatment and regeneration of cellulose is a growing area of research. Here we report the development of a rapid and simple method for the determination of residual ethanol content in two hydrophilic ILs, 1-butyl-3-methylimidazolium chloride and 1-ethyl-3-methylimidazolium acetate. The method utilizes headspace solid-phase microextraction coupled with gas chromatography at elevated extraction temperatures, resulting in rapid equilibration times. The effect of IL water content on the ethanol extraction efficiency is presented. Recovery experiments carried out in real samples gave recoveries ranging from 96.8 to 98.2%.

Figure

Ionic liquids are becoming widely used as solvents for the regeneration of lignocellulosic biomass. In this communcation, a method based on headspace solid-phase microextraction coupled to gas chromatography is described to determine the ethanol content in two widely used ionic liquid matrices

Keywords

Ionic liquid Room temperature ionic liquid Ethanol Gas chromatography Solid-phase microextraction Headspace extraction 

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Fei Zhao
    • 1
  • Thehazhnan K. Ponnaiyan
    • 2
  • Christa M. Graham
    • 1
  • Constance A. Schall
    • 2
  • Sasidhar Varanasi
    • 2
  • Jared L. Anderson
    • 1
  1. 1.Department of ChemistryThe University of ToledoToledoUSA
  2. 2.Department of Chemical and Environmental EngineeringThe University of ToledoToledoUSA

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