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Graphene Enclosure of Chemically Fixed Mammalian Cells for Liquid-Phase Electron Microscopy
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Monolithic graphene fibers for solid-phase microextraction.

Jing Fan1, Zelin Dong, Meiling Qi

  • 1Key Laboratory of Cluster Science, Ministry of Education of China, and School of Chemistry, Beijing Institute of Technology, Beijing 100081, PR China.

Journal of Chromatography. A
|November 12, 2013
PubMed
Summary
This summary is machine-generated.

Monolithic graphene fibers were developed using a novel hydrothermal method for solid-phase microextraction (SPME). These durable fibers efficiently extract polycyclic aromatic hydrocarbons (PAHs) from water samples using gas chromatography.

Keywords:
Capillary gas chromatographyMonolithic graphene fiberPolycyclic aromatic hydrocarbonsSolid-phase microextraction

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Environmental Science

Background:

  • Solid-phase microextraction (SPME) is a crucial technique for sample preparation in analytical chemistry.
  • Conventional SPME fibers often face limitations in terms of fabrication scalability and reusability.
  • Graphene's unique properties offer potential for developing advanced extraction materials.

Purpose of the Study:

  • To develop and evaluate monolithic graphene fibers for solid-phase microextraction (SPME).
  • To investigate the extraction performance of these fibers for aromatic compounds, particularly polycyclic aromatic hydrocarbons (PAHs).
  • To establish an optimized method for PAH analysis in aqueous samples.

Main Methods:

  • Fabrication of monolithic graphene fibers using a dimensionally confined hydrothermal strategy with a glass pipeline reactor.
  • Direct-immersion (DI) mode SPME coupled with capillary gas chromatography (GC).
  • Optimization of extraction conditions including temperature, time, and salt concentration.

Main Results:

  • The novel hydrothermal strategy enabled the fabrication of uniform graphene fibers several meters in length.
  • Graphene fibers exhibited higher extraction efficiencies for PAHs compared to n-alkanes due to π-π stacking and hydrophobic interactions.
  • The fibers demonstrated excellent durability, with over 160 repetitive uses without significant performance loss.
  • The optimized DI-SPME-GC method achieved a linear range of 0.05-200 μg/L, LODs of 4.0-50 ng/L, and recoveries of 78.9-115.9% for PAHs.

Conclusions:

  • Monolithic graphene fibers fabricated via a confined hydrothermal method are effective for SPME.
  • The developed DI-SPME-GC method provides a sensitive and robust approach for analyzing PAHs in environmental water samples.
  • This technique offers advantages in terms of fiber scalability, durability, and extraction efficiency for target analytes.