A Comparative Study of the National Institute for Occupational Safety and Health 7400 “A” and “B” Counting Rules Using Refractory Ceramic Fibers

Details

• Personal Author:
  Buchta, Teresa M. ; Gartside PS ; Lemasters GK ; Lockey, James E. ; Rice CH
• Description:
  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. [Description provided by NIOSH]
• Subjects:
  Asbestos Ceramics Environmental Monitoring Inorganic Chemicals Occupational Health Particulate Matter Safety
• Keywords:
  Air-quality-monitoring Air-sampling-techniques Analytical-methods Asbestos-fibers Ceramic-materials Exposure-assessment Exposure-limits Fiber-deposition Fibrous-bodies NIOSH-Grant NIOSH-Publication

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• ISSN:
  1047-322X
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Ohio ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  58-61
• Volume:
  13
• Issue:
  1
• NIOSHTIC Number:
  nn:00241265
• Citation:
  Appl Occup Environ Hyg 1998 Jan; 13(1):58-61
• Contact Point Address:
  Environmental Health University of Cincinnati 3223 Eden Avenue Cincinnati, OH 45267-0056
• Federal Fiscal Year:
  1998
• Performing Organization:
  University of Cincinnati, Cincinnati, Ohio
• Peer Reviewed:
  True
• Start Date:
  19910701
• Source Full Name:
  Applied Occupational and Environmental Hygiene
• End Date:
  19970630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:8dc65c78c40961f247207f424e35c67cf7303b91c900e4f87f8c87ec4e4b24d61304c425935bb1fdc84f5a228eb491f5a1fd732e7421cea0522276219dd276d2
• Download URL:
  https://stacks.cdc.gov/view/cdc/198084/cdc_198084_DS1.pdf
• File Type:
  [PDF - 537.73 KB ]