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Related Experiment Videos

Diffusive uptake in passive and active adsorbent sampling using thermal desorption tubes.

Stuart Batterman1, Tricia Metts, Pentti Kalliokoski

  • 1The University of Michigan, 109 Observatory Drive, Ann Arbor, MI 48109-2029, USA. StuartB@umich.edu

Journal of Environmental Monitoring : JEM
|January 2, 2003
PubMed
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Low flow active sampling requires controlling diffusive uptake. Orifice-equipped samplers minimize diffusive flux, improving measurement accuracy for vapors and gases.

Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Air Quality Monitoring

Background:

  • Low flow active sampling offers advantages like long integration times and miniaturization.
  • Diffusive uptake can bias measurements in conventional sorbent tubes at low flow rates (< 4 ml min⁻¹).

Purpose of the Study:

  • To analyze diffusive and advective uptake in tube-type samplers.
  • To experimentally validate methods for reducing diffusive uptake in low flow sampling.
  • To develop a model for predicting adsorbent saturation effects.

Main Methods:

  • Theoretical analysis of sampling geometries.
  • Laboratory and field experiments with conventional and orifice-equipped samplers.
  • Estimation of glass wool packing tortuosity and porosity.

Related Experiment Videos

  • Development of a model for saturated adsorbent layers.

    • Main Results:

    • Diffusive uptake significantly impacts low flow sampling (< 4 ml min⁻¹).
    • Orifice-equipped samplers effectively reduce diffusive uptake, improving precision (8% vs. 13% for conventional tubes).
    • Glass wool packing has low resistance to diffusion; packing variations can affect precision.

    Conclusions:

    • Orifices serve as effective diffusion barriers, crucial for accurate low flow active sampling.
    • Maintaining flow rates > 1-4 ml min⁻¹ is recommended for conventional tubes to limit errors.
    • A model for saturated adsorbent layers explains observed declines in passive sampling uptake rates.