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Related Experiment Videos

Time-weighted average passive sampling with a solid-phase microextraction device.

Yong Chen1, Janusz Pawliszyn

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

Analytical Chemistry
|May 2, 2003
PubMed
Summary
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A modified Solid-Phase Microextraction (SPME) device effectively measures time-weighted average (TWA) concentrations of volatile organic compounds (VOCs) as a passive sampler. The 75-microm Carboxen/poly(dimethylsiloxane) fiber shows excellent performance and stability for VOC air monitoring.

Area of Science:

  • Analytical Chemistry
  • Environmental Science
  • Occupational Health

Background:

  • Conventional air sampling methods can be cumbersome.
  • Solid-Phase Microextraction (SPME) offers a promising alternative for air analysis.
  • Passive sampling devices are needed for long-term exposure monitoring.

Purpose of the Study:

  • To evaluate a modified Solid-Phase Microextraction (SPME) device as a passive sampler for determining time-weighted average (TWA) concentrations of volatile organic compounds (VOCs).
  • To assess the performance of different SPME fiber coatings under various sampling conditions.
  • To compare field results with established air sampling methods.

Main Methods:

  • A modified SPME device with retracted fiber was used for passive sampling.

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  • Molecular diffusion and sorption onto coated fibers were the collection mechanisms.
  • Fick's first law of diffusion was applied to quantify accumulated analytes.
  • Tested fibers included poly(dimethylsiloxane) and Carboxen/poly(dimethylsiloxane) coatings.
  • Evaluated "zero sink", face velocity, and response time characteristics.

    • Main Results:

    • The 75-microm Carboxen/poly(dimethylsiloxane) fiber demonstrated excellent performance as a passive sampler for VOCs.
    • TWA passive sampling with the modified SPME device was largely independent of face velocity.
    • The sampler showed tolerance to wide ranges of analyte concentrations and sampling times.
    • Environmental factors like temperature, humidity, and ozone had minimal impact on sampling.
    • The chosen fiber could retain VOCs for up to two weeks without significant loss.
    • Field testing showed good agreement with National Institute of Occupational Health and Safety (NIOSH) method 1501.

    Conclusions:

    • The modified SPME device, particularly with the 75-microm Carboxen/poly(dimethylsiloxane) fiber, is a robust and reliable passive sampler for TWA VOC concentration measurement.
    • This method offers advantages in terms of operational simplicity, tolerance to varying conditions, and stability.
    • The SPME passive sampler provides a viable alternative to conventional methods for occupational and environmental air monitoring.