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Related Experiment Videos

Field sampling with a polydimethylsiloxane thin-film.

Leslie Bragg1, Zhipei Qin, Mehran Alaee

  • 1Department of Chemistry, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada.

Journal of Chromatographic Science
|August 4, 2006
PubMed
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New field samplers using polydimethylsiloxane (PDMS) thin-film offer higher sensitivity for detecting low-level environmental pollutants. This advancement in solid-phase microextraction (SPME) technology enables more accurate analysis of contaminants like polycyclic aromatic hydrocarbons.

Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Material Science

Background:

  • Solid-phase microextraction (SPME) is a widely used technique for analyzing contaminants.
  • Existing SPME methods can have limitations in sensitivity and mass uptake for certain analytes.
  • Development of novel extraction phases is crucial for enhancing analytical capabilities.

Purpose of the Study:

  • To develop and evaluate novel field samplers utilizing polydimethylsiloxane (PDMS) thin-film for environmental analysis.
  • To improve upon existing solid-phase microextraction (SPME) techniques by increasing sensitivity and mass uptake.
  • To accurately quantify low-level concentrations of polycyclic aromatic hydrocarbons (PAHs) in environmental samples.

Main Methods:

  • Fabrication of PDMS thin-film field samplers mounted on stainless steel handles.

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  • Protection of samplers using copper cages to prevent biofouling during deployment.
  • Application of kinetic or equilibrium calibration with isotopically labeled internal standards for on-site calibration.
  • Quantification of analytes using gas chromatography-mass spectrometry (GC-MS).

    • Main Results:

    • Successful deployment and operation of PDMS thin-film samplers in the Meuse River and Hamilton Harbour.
    • Identification of polycyclic aromatic hydrocarbons (PAHs), with quantification of fluoranthene and pyrene in the low ng/L range.
    • Demonstrated higher sensitivity and mass uptake compared to traditional SPME due to the high surface-to-volume ratio of the PDMS thin-film.

    Conclusions:

    • The developed PDMS thin-film field samplers provide a highly sensitive method for detecting environmental contaminants.
    • This technique allows for the detection of analytes at levels often unachievable by other methods.
    • The PDMS samplers represent a significant advancement in environmental monitoring for pollutants like PAHs.