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Analysis of sampling line bias on respirable mass measurement.

Authors
Peters-TM; Volkwein-JC
Source
Appl Occup Environ Hyg 2003 Jun; 18(6):458-465
NIOSHTIC No.
20023416
Abstract
This study investigated the bias introduced by an inlet sampling line on a respirable mass monitor. The 1.5-m electrically conductive, flexible sampling line conducts aerosol at a flow rate of 2.2 Lpm from a helmet-mounted inlet to a waist-mounted sensor for mass concentration measurement. Particulate transport was modeled for each section of the sampling line and considered the effects of diffusion, gravitational settling, and inertial impaction. An estimate of respirable mass concentration measured with the sampling line was determined by integrating assumed workplace aerosols with the transport curves. The bias introduced by the sampling line was then calculated by dividing the difference between the respirable mass concentration with and without the sampling line by that without the sampling line. For the current sampling line, in which the inner diameter is 4.83 mm, bias was calculated as -0.3%, -2.4%, -4.6%, and -6.7% for four test aerosols with mass median aerodynamic diameters of 0.6, 4, 12, and 30 micrometers, respectively. Optimization studies suggest that increasing the sampling line with a larger inner diameter by a factor of 1.25 to 1.75 will minimize bias to below -3.0%. An experimental study confirmed that bias due to the presence of the sampling line is small.
Keywords
Dust-measurement; Dust-sampling; Respirable-dust; Underground-miners; Miners; Personal-dust-monitor; Samplers; Sampling-equipment; Sampling-methods
Contact
NIOSH, Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236
CODEN
AOEHE9
Publication Date
20030601
Document Type
Journal Article
Fiscal Year
2003
NTIS Accession No.
NTIS Price
Issue of Publication
6
ISSN
1047-322X
NIOSH Division
PRL
Priority Area
Research Tools and Approaches: Exposure Assessment Methods
Source Name
Applied Occupational and Environmental Hygiene
State
PA
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