Characterization of a vortex shaking method for aerosolizing fibers

Details

• Personal Author:
  Deye G ; Ku BK ; Turkevich LA
• Description:
  Generation of well-dispersed, well-characterized fibers is important in toxicology studies. A vortex-tube shaking method is investigated using glass fibers to characterize the generated aerosol. Controlling parameters that were studied included initial batch amounts of glass fibers, preparation of the powder (e.g., preshaking), humidity, and airflow rate. Total fiber number concentrations and aerodynamic size distributions were typically measured. The aerosol concentration is only stable for short times (t <10 min) and then falls precipitously, with concomitant changes in the aerosol aerodynamic size distribution; the plateau concentration and its duration both increase with batch size. Preshaking enhances the initial aerosol concentration and enables the aerosolization of longer fibers. Higher humidity strongly affects the particle size distribution and the number concentration, resulting in a smaller modal diameter and a higher number concentration. Running the vortex shaker at higher flow rates (Q > 0.3 lpm), yields an aerosol with a particle size distribution representative of the batch powder; running the vortex shaker at a lower aerosol flowrate (Q approximately 0.1 lpm) only aerosolizes the shorter fibers. These results have implications for the use of the vortex shaker as a standard aerosol generator. [Description provided by NIOSH]
• Subjects:
  Aerosols Air Movements Air Pollutants, Occupational Asbestos Glass Hazardous Substances Humidity Inorganic Chemicals Laboratories Occupational Health Particulate Matter Safety Toxicology

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• Keywords:
  Aerosol-generators Air-flow Airborne-fibers Analytical-instruments Analytical-processes Asbestos-fibers Fibrous-bodies Fibrous-glass Laboratory-equipment Measurement-equipment Nanotechnology Particle-aerodynamics Testing-equipment Toxic-effects Toxic-materials

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• ISSN:
  0278-6826
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  Ohio ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DART - Division of Applied Research and Technology
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  47
• Issue:
  12
• NIOSHTIC Number:
  nn:20043319
• Citation:
  Aerosol Sci Technol 2013 Dec; 47(12):1293-1301
• Contact Point Address:
  Bon Ki Ku, Centers for Disease Control and Prevention (CDC), National Institute for Occupational Safety and Health (NIOSH), 4676 Columbia Parkway, MS-R3, Cincinnati, OH 45226, USA
• Email:
  bik5@cdc.gov
• Federal Fiscal Year:
  2014
• NORA Priority Area:
  Manufacturing ; Mining
• Peer Reviewed:
  True
• Source Full Name:
  Aerosol Science and Technology
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:931a6004ff8b5d434afd26d315c14819e765b64f17bb2d0e7d08bfe1d18dbf5e972742217326ae980e4108ccc581fb275ceb018ed98773798ef8cfe1dd4a1e72
• Download URL:
  https://stacks.cdc.gov/view/cdc/195242/cdc_195242_DS1.pdf
• File Type:
  [PDF - 890.09 KB ]