Correction of Sampler-to-Sampler Comparisons Based on Aerosol Size Distribution

Details

• Personal Author:
  Golla V ; Lo J ; Nakatsu J ; O'Shaughnessy PT ; Reynolds S ; Tillery MI ; Golla V ; Lo J ; Nakatsu J ; O'Shaughnessy PT ; Reynolds S ; Tillery MI
• Description:
  This article explains a simple method for correcting a sampler-to-sampler ratio for changes in size distribution by computing a bias factor that relates the measured ratio with a ratio determined from equations that describe the collection efficiency curves of the samplers while taking size distribution into account. Laboratory trials were conducted to determine whether the resulting bias factor is independent of aerosol size distribution. During these studies, a 3-piece cassette and respirable cyclone were compared with an inhalable sampler in both a still-air chamber and a moving-air chamber operated at 0.2 m/sec and 1.0 m/sec. An ISO test dust of various size fractions was generated to produce an aerosol with mass median aerodynamic diameter ranging from 1.4 microm to 10.1 microm. An organic dust consisting of ground grain material was also applied to the still-air chamber to demonstrate differences between dust types. Results showed that the bias value was significantly different between dust types for both the cyclone/ inhalable (p=0.001) and cassette/inhalable (p=0.033) comparisons but was not different between wind conditions for either comparison. All but one comparison had insignificant slopes when comparing the bias value with median diameter, indicating that the bias value could be used to correct for size distributions in most conditions. However, bias values determined when comparing the cyclone with the inhalable sampler in the still-air condition produced a positive slope for median diameters less than 4 microm (p=0.008). Further research is needed to determine why the actual cyclone/inhalable ratio decreases relative to the expected ratio as the proportion of respirable particles increases. These results suggest that, for most conditions, the size-distribution compensation can be applied to sampler-to-sampler correlations provided that the original comparison was performed with the same dust type. [Description provided by NIOSH]
• Subjects:
  Air Conditioning Air Movements Air Pollutants, Occupational Air Pollution Air Pollution, Indoor Air Pressure Coloring Agents Dust Environmental Monitoring Inhalation Exposure Laboratories Occupational Health Respiratory Protective Devices Respiratory System Risk Assessment Risk Factors Safety Solvents

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• Keywords:
  Air-conditioning-equipment Air-contamination Air-filters Air-flow Air-monitoring Air-pressure Air-purification Air-purifiers Air-purifying-respirators Air-quality Air-quality-control Air-quality-measurement Air-quality-monitoring Air-samplers Air-samples Air-sampling Air-sampling-equipment Air-sampling-techniques Air-treatment Air-treatment-equipment Author Keywords: Aerosol Samplers Correlation Analysis Dust-analysis Dust-collection Dust-collectors Dust-control Dust-control-equipment Dust-counters Dust-counting Dust-explosions Dust-exposure Dust-extraction Dust-inhalation Dust-measurement Dust-particles Dust-samplers Dust-sampling Inhalants Inhalation-studies Injury-prevention Laboratory-equipment Laboratory-techniques Laboratory-testing Laboratory-work Laboratory-workers Measurement-equipment Normalization Technique Organic-chemicals Organic-compounds Organic-dusts Organic-mercury Organic-peroxides Organic-pigments Organic-salts Organic-solvents Organic-sulfates Organic-sulfides Organic-vapors Risk-analysis Risk-factors

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• ISSN:
  1545-9624
• Document Type:
  Text
• Funding:
  Cooperative Agreement ; Grant
• Genre:
  Journal Article ; Journal Article
• Place as Subject:
  Colorado ; Iowa ; Kentucky ; North Carolina ; OSHA Region 4 ; OSHA Region 7 ; OSHA Region 8
• CIO:
  National Institute for Occupational Safety and Health (NIOSH) ; National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health ; Workplace Safety & Health
• Location:
  North America ; North America
• Pages in Document:
  237-345
• Volume:
  4
• Issue:
  4
• NIOSHTIC Number:
  nn:20035872
• Citation:
  J Occup Environ Hyg 2007 Apr; 4(4):237-245
• Contact Point Address:
  P. T. O'Shaughnessy, The University of Iowa , Occupational and Environmental Health, Iowa City, Iowa 52242
• Email:
  patrick-oshaughnessy@uiowa.edu
• Federal Fiscal Year:
  2007
• Performing Organization:
  Colorado State University - Fort Collins
• Peer Reviewed:
  True
• Start Date:
  20010930
• Source Full Name:
  Journal of Occupational and Environmental Hygiene
• End Date:
  20030929
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:142311ec643d68dbc335de54a33896c72a3077d6baebaadc3594286aedeca98cad745601d9bdeea91bc64fb7c74b7ee95c7d78d379923e0ee5cdfbb52946e251
• Download URL:
  https://stacks.cdc.gov/view/cdc/187556/cdc_187556_DS1.pdf
• File Type:
  [PDF - 661.22 KB ]