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Polymeric ionic liquid bucky gels as sorbent coatings for solid-phase microextraction.

Cheng Zhang1, Jared L Anderson2

  • 1Department of Chemistry, The University of Toledo, Toledo, OH 43606, USA.

Journal of Chromatography. A
|April 29, 2014
PubMed
Summary
This summary is machine-generated.

Novel polymeric ionic liquid (PIL) bucky gels, combined with multi-walled carbon nanotubes (MWCNT), show enhanced extraction of polycyclic aromatic hydrocarbons (PAHs) using solid-phase microextraction (SPME). This new sorbent offers sensitive detection for environmental water analysis.

Keywords:
Gas chromatographyIonic liquidMulti-walled carbon nanotubesPolycyclic aromatic hydrocarbonsPolymeric ionic liquidsSolid-phase microextraction

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Environmental Science

Background:

  • Polymeric ionic liquids (PILs) are versatile materials with tunable properties.
  • Multi-walled carbon nanotubes (MWCNTs) offer high surface area and unique electronic properties.
  • Solid-phase microextraction (SPME) is a widely used technique for sample preparation.

Purpose of the Study:

  • To develop novel cross-linked PIL bucky gel sorbent coatings for SPME.
  • To investigate the extraction efficiency of these coatings for aromatic analytes, specifically polycyclic aromatic hydrocarbons (PAHs).
  • To evaluate the performance of the developed method for environmental water samples.

Main Methods:

  • Free-radical polymerization was used to synthesize cross-linked PIL bucky gels by combining polymerizable ionic liquids with MWCNTs.
  • The synthesized PIL bucky gels were employed as sorbent coatings for SPME.
  • Extraction efficiency, extraction mechanism, partition coefficients (logKfs), and limits of detection (LOD) were determined.
  • Recovery studies were conducted using river and tap water samples.

Main Results:

  • PIL bucky gel sorbent coatings demonstrated significantly enhanced π-π interactions with aromatic analytes compared to neat PIL coatings.
  • Higher extraction efficiency was observed for PAHs using PIL bucky gel sorbent coatings.
  • A partitioning extraction mechanism was confirmed, with MWCNTs not altering the fundamental mechanism.
  • Low limits of detection (1-2.5 ng L(-1)) were achieved for PAHs.
  • Good recovery rates were obtained in real water samples, validating the method's applicability.

Conclusions:

  • Cross-linked PIL bucky gels are effective sorbent materials for SPME of PAHs.
  • The incorporation of MWCNTs enhances the extraction performance of PIL-based sorbents.
  • The developed SPME method is sensitive and suitable for the analysis of PAHs in environmental water samples.