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Laboratory evaluation of pressure differential-based respirable dust detector tube.

Authors
Volkwein-JC; Schoeneman-A; Page-S
Source
Appl Occup Environ Hyg 2000 Jan; 15(1):158-164
NIOSHTIC No.
20022682
Abstract
Assessment of exposure to occupational dusts is a first step in reducing exposures to harmful dust concentrations. A new type of respirable dust sampler was developed and compared side-by-side to personal gravimetric samplers in the laboratory. The new sampler correlates filter back pressure with mass accumulation to provide mid-shift- and end-of-shift determinations of cumulative exposure. The sampler uses a small low flow rate pump to draw dust through a small detector tube that contains a porous urethane foam respirable classification section and glass fiber filter that collects respirable dust. Six different coal dusts were aerosolized in a laboratory dust chamber and a total of 119 triplicate observations were obtained. For individual coal types, the correlation coefficients were between 0.87 and 0.97. The precision of the two methods was similar, with the percent relative standard deviation of the personal samplers of 12 percent and the new detector method of 14 percent. For all coal types tested th data were best described by a power function where delta P = 1.43 mass (0.85), with a correlation coefficient of 0.73. The method becomes more accurate at higher dust loadings such that all laboratory data with mass loadings greater than an equivalent concentration of 2 mg/m3 fall within +/- 25 percent of the power function. Assessment of the method under field conditions is in progress.
Keywords
Respirable-dust; Monitors; Exposure-levels; Coal-dust; Samplers; Sampling-equipment; Sampling; Exposure-methods; Aerosols
CODEN
AOEHE9
Publication Date
20000101
Document Type
Journal Article
Fiscal Year
2000
NTIS Accession No.
NTIS Price
Issue of Publication
1
ISSN
1047-322X
NIOSH Division
PRL
Source Name
Applied Occupational and Environmental Hygiene
State
PA
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