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Electrostatic effects in asbestos sampling. I: Experimental measurements.

P A Baron1, G J Deye

  • 1Division of Physical Sciences and Engineering, National Institute for Occupational Safety and Health, Cincinnati, OH 45226.

American Industrial Hygiene Association Journal
|February 1, 1990
PubMed
Summary
This summary is machine-generated.

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Electrostatic charge significantly impacts airborne particle sampling. Low humidity and nonconductive samplers increase errors, while higher flow rates and conductive samplers improve accuracy and uniformity.

Area of Science:

  • Environmental Science
  • Aerosol Science
  • Occupational Health

Background:

  • Electrostatic charge can introduce significant errors in airborne particle sampling.
  • These errors manifest as nonuniform particle deposits and sample loss, affecting accuracy.
  • Factors influencing these electrostatic effects include particle charge, sampler properties, and flow dynamics.

Purpose of the Study:

  • To investigate the impact of electrostatic charge on sampling efficiency and uniformity.
  • To evaluate the role of particle charge, sampler conductivity, and flow rate.
  • To understand the influence of relative humidity on particle charge during aerosol generation.

Main Methods:

  • Measurements of particle charge and concentration were conducted at varying relative humidity levels using chrysotile fibers.

Related Experiment Videos

  • Experiments compared sampling efficiency and deposit uniformity using conductive versus nonconductive samplers.
  • The effect of sampling flow rate on particle deposition was systematically analyzed.

    • Main Results:

    • A significant increase in fiber charge and decrease in concentration occurred below 15% relative humidity.
    • Nonconductive samplers exhibited biased and variable deposits with charged particles.
    • Conductive samplers yielded more symmetrical and less biased deposits.
    • Increased sampling flow rate improved efficiency and reduced deposit variability.

    Conclusions:

    • Electrostatic sampling issues are most prevalent under low humidity conditions.
    • High sampling flow rates and conductive samplers mitigate electrostatic interference.
    • Analysts should focus on central filter areas to minimize bias and variability in samples.