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Characterization of a vortex shaking method for aerosolizing fibers.

Authors
Ku-BK; Deye-G; Turkevich-LA
Source
Aerosol Sci Tech 2013 Dec; 47(12):1293-1301
NIOSHTIC No.
20043319
Abstract
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 ~ 0.1 lpm) only aerosolizes the shorter fibers. These results have implications for the use of the vortex shaker as a standard aerosol generator.
Keywords
Nanotechnology; Fibrous-bodies; Asbestos-fibers; Toxic-effects; Toxic-materials; Toxicology; Measurement-equipment; Testing-equipment; Airborne-fibers; Aerosol-generators; Fibrous-glass; Analytical-processes; Analytical-instruments; Laboratory-equipment; Particle-aerodynamics; Air-flow; Humidity
Contact
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
CODEN
ASTYDQ
Publication Date
20131201
Document Type
Journal Article
Email Address
bik5@cdc.gov
Fiscal Year
2014
NTIS Accession No.
NTIS Price
Identifying No.
M112013
Issue of Publication
12
ISSN
0278-6826
NIOSH Division
DART
Priority Area
Manufacturing; Mining
Source Name
Aerosol Science and Technology
State
OH
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