Analysis of biogenic silica fibers from rice farming operations

Details

• Personal Author:
  John W ; Lawson R ; Scales D ; Schmidt J
• Description:
  A method was developed to quantitate biogenic silica (7631869) fibers. Particles were sampled over track etched filters that were prepared by the direct cleaning method for transmission electron microscope (TEM) analysis. The method was used to analyze about 100 samples from rice field operations. For sampling in the vicinity of field operations, it was advantageous to precede the filters with cyclones to exclude large, nonrespirable structures that obscured fibers on the filter. The optimum fiber loading on the filter was 100 to 1,000 fibers/square millimeter. To prevent overloading, the sampled volume was held to 30 liters through the 25 millimeter filters, providing a detection limit of 0.1 fiber/cubic centimeter. The method produced useful results in the rice emissions study. The present method represented a further development of the TEM method for biogenic silica fibers, the only general method currently available. The authors suggest that the method be regarded as provisional due to the lack of interlaboratory testing and use by others. [Description provided by NIOSH]
• Subjects:
  Agriculture Air Pollutants, Occupational Dust Occupational Health Safety Silicon Dioxide
• Keywords:
  Agricultural-industry Airborne-fibers Analytical-methods Dust-exposure Fibrous-dusts NIOSH-Cooperative-Agreement NIOSH-Publication Plant-substances Sampling-methods Silica-dusts
• ISSN:
  1047-322X
• Document Type:
  Text
• Funding:
  Cooperative Agreement
• Genre:
  Journal Article
• Place as Subject:
  California ; OSHA Region 9
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  10
• Issue:
  8
• NIOSHTIC Number:
  nn:00228668
• Citation:
  Appl Occup Environ Hyg 1995 Aug; 10(8):685-691
• CAS Registry Number:
  Silica (CAS RN 7631-86-9)
• Federal Fiscal Year:
  1995
• Performing Organization:
  University of California - Davis
• Peer Reviewed:
  True
• Start Date:
  19900930
• Source Full Name:
  Applied Occupational and Environmental Hygiene
• End Date:
  20020929
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:d661478b07d01757171a50c7af97f86e9cc117eab7abc1c26bcef8e2d70dce39e316114349d6cee49dc7fe3d2f5a292f29da46047fba909507468b6c3c30b90f
• Download URL:
  https://stacks.cdc.gov/view/cdc/204158/cdc_204158_DS1.pdf
• File Type:
  [PDF - 1.43 MB ]