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Updated: Jun 29, 2026

Microdialysis of Ethanol During Operant Ethanol Self-administration and Ethanol Determination by Gas Chromatography

Microdialysis of Ethanol During Operant Ethanol Self-administration and Ethanol Determination by Gas Chromatography

Published on: September 5, 2012

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

Fei Zhao¹, Thehazhnan K Ponnaiyan, Christa M Graham

¹Department of Chemistry, The University of Toledo, 2801 W. Bancroft Street, Toledo, OH 43606, USA.

Analytical and Bioanalytical Chemistry

|October 8, 2008

Summary

This study presents a fast method using headspace solid-phase microextraction and gas chromatography to measure residual ethanol in ionic liquids (ILs). The technique is effective even with varying water content in the ILs.

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Published on: July 14, 2017

Area of Science:

Green chemistry and sustainable solvents
Analytical chemistry techniques
Biomass processing and cellulose regeneration

Background:

Ionic liquids (ILs) are increasingly used as non-derivatizing solvents for cellulose pretreatment and regeneration.
Accurate determination of residual solvents like ethanol in ILs is crucial for process efficiency and safety.
Hydrophilic ILs, such as 1-butyl-3-methylimidazolium chloride and 1-ethyl-3-methylimidazolium acetate, are common in these applications.

Purpose of the Study:

To develop a rapid and simple analytical method for quantifying residual ethanol in specific hydrophilic ionic liquids.
To investigate the influence of water content within the ionic liquids on the efficiency of ethanol extraction.
To validate the developed method's accuracy and reliability using real-world samples.

Main Methods:

Utilized headspace solid-phase microextraction (HS-SPME) coupled with gas chromatography (GC).
Employed elevated extraction temperatures to achieve rapid equilibration times for ethanol volatilization.
Investigated the impact of varying water content in ionic liquids on ethanol recovery.

Main Results:

Achieved rapid equilibration times due to elevated extraction temperatures.
Demonstrated the method's effectiveness across a range of ionic liquid water content.
Real-sample recovery experiments yielded high accuracy, ranging from 96.8% to 98.2%.

Conclusions:

The developed HS-SPME-GC method provides a fast, simple, and accurate means for determining residual ethanol in hydrophilic ionic liquids.
The method is robust and reliable for quality control in processes involving cellulose pretreatment and regeneration using these ILs.
This analytical approach supports the broader application of ionic liquids in sustainable chemical processes.