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A comparative study of the National Institute for Occupational Safety and Health 7400 "A" and "B" counting rules using refractory ceramic fibers.

Authors
Buchta-TM; Rice-CH; Lockey-JE; Lemasters-GK; Gartside-PS
Source
Appl Occup Environ Hyg 1998 Jan; 13(1):58-61
NIOSHTIC No.
00241265
Abstract
Industrial hygiene samples were taken at seven facilities where refractory ceramic fibers (RCF) were manufactured and analyzed. NIOSH Method 7400 was used to obtain the 150 samples and a comparison was made between 7400-A and 7400-B counting rules used to estimate exposures. The two methods differ according to the definition of a fiber, but the data demonstrated no significant difference in the relative counting levels obtained. Both counting techniques had similar magnitudes of intracounter variation. A frequency distribution of the data sets generated by the A and B counting rules indicated that the fiber density values were log normally distributed. A paired t-test was performed on the set of 150 transformed counts to determine if there was a statistical difference in the results obtained from the two counting techniques. The result of the paired t-test indicated no difference in fiber density between the two counting rules. The findings indicate that it would be possible to combine the results from these two methods when conducting a long term exposure assessment evaluation of RCF manufacturing operations. The authors suggest, however, that in other settings researchers should conduct a similar evaluation prior to merging samples analyzed by different rules.
Keywords
NIOSH-Publication; NIOSH-Grant; Analytical-methods; Fibrous-bodies; Air-quality-monitoring; Air-sampling-techniques; Fiber-deposition; Asbestos-fibers; Ceramic-materials; Exposure-assessment; Exposure-limits
Contact
Environmental Health University of Cincinnati 3223 Eden Avenue Cincinnati, OH 45267-0056
CODEN
AOEHE9
Publication Date
19980101
Document Type
Journal Article
Funding Amount
1935649.00
Funding Type
Grant
Fiscal Year
1998
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-T42-OH-07091
Issue of Publication
1
ISSN
1047-322X
Source Name
Applied Occupational and Environmental Hygiene
State
OH
Performing Organization
University of Cincinnati, Cincinnati, Ohio
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