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Investigation of filter bypass leakage and a test for aerosol sampling cassettes.

Authors
Baron-PA; Khanina-A; Martinez-AB; Grinshpun-SA
Source
Aerosol Sci Tech 2002 Aug; 36(8):857-865
NIOSHTIC No.
20022262
Abstract
Plastic filter cassettes (37 and 25 mm), which are press fitted together to seal and hold a filter in place, are commonly used for sampling aerosols. Aerosol bypass leakage around the filter has been reported by several researchers and attempts have been made to test for leakage and to reduce the likelihood of leakage by improving cassette design. Under typical sampling conditions, there is often no indication to the user that leakage may have occurred. In the present study, a particle count leak test was developed that used a particle counter that measured the particle number concentration of ambient aerosol (primarily submicrometer particles) upstream and downstream of the filter cassette. The relationship between leak test results and particle loss from the filter depended on particle size and type in a complex fashion. The mechanisms of particle loss were investigated and the losses increased for particles above 2 Ám and were much greater for solid and fume aerosols than for oil droplets. Although the test could not be used to predict particle mass loss during sampling, the test was a sensitive indicator of cassette bypass leakage and was used to establish compression pressures needed for proper assembly of these cassettes.
Keywords
Aerosols; Aerosol-sampling; Fumes; Industrial-hygiene; Air-samplers; Air-sampling-equipment; Air-sampling; Aerosol-particles; Filters
Contact
NIOSH, MS R-7, 4676 Columbia Parkway, Cincinnati, OH 45226
CODEN
ASTYDQ
Publication Date
20020801
Document Type
Journal Article
Email Address
pab2@cdc.gov
Fiscal Year
2002
NTIS Accession No.
NTIS Price
Issue of Publication
8
ISSN
0278-6826
NIOSH Division
DART
Priority Area
Research Tools and Approaches: Exposure Assessment Methods
Source Name
Aerosol Science and Technology
State
OH
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