An International Comparison of the Crystallinity of Calibration Materials for the Analysis of Respirable Alpha-Quartz Using X-Ray Diffraction and a Comparison with Results from the Infrared KBr Disc Method

Details

• Personal Author:
  Beauparlant M ; Dion C ; Fernandez P ; Friede B ; Kauffer E ; Key-Schwartz, Rosa J. ; Moulut JC ; Stacey P ; Wake D
• Description:
  This paper lists the values recommended by the working group for use with XRD analysis. The values for crystallinity obtained for some of the materials (NIST 1878, Min-U-Sil5 and A9950) were 6-7% lower than the original certification or estimates reported in other comparisons. Crystallinity values obtained by XRD gave a good correlation with BET surface area measurements (r(2) = 0.91) but not with mean aerodynamic particle size (r(2) = 0.31). Subsamples of two of the materials (A9950 Respirable and Quin 1 Respirable) with smaller particle size distribution than their parent material did not show any significant change in their values for crystallinity, suggesting that the area XRD measurement of these materials within the particle size range collected is more dependent on how the quartz is formed geologically or how it is processed for use. A comparison of results from laboratories using the infrared (IR) and KBr disc method showed that this method is more dependent than XRD on differences in the particle size within the respirable size range, whereas the XRD values were more consistent between the different measurement values obtained on each material. It was not possible to assign a value for percentage purity to each material for users of IR analysis. This work suggests that differences are likely to exist between the results from XRD and IR analysis when measuring 'real' workplace samples and highlights the importance of matching the particle size of the calibration material to the particle size of the workplace dust for measurements of crystalline quartz. [Description provided by NIOSH]
• Subjects:
  Air Pollutants, Occupational Case Reports Dust Environmental Monitoring Hypersensitivity Irritants Laboratories Lung Occupational Exposure Occupational Health Particulate Matter Quartz Respiratory Hypersensitivity Respiratory System Safety Safety Management Silicon Dioxide

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• Keywords:
  Airborne-particles Author Keywords: Analysis Case-studies Chemical-hypersensitivity Crystallinity Dust-exposure Dust-inhalation Dust-measurement Dust-sampling Employee-exposure Employee-health Exposure-assessment Exposure-chambers Exposure-levels Exposure-methods Geophysics Infrared Inhalation-studies Laboratory-testing Occupational-exposure Occupational-hazards Occupational-health Particle-aerodynamics Particulate-dust Particulate-sampling-methods Particulates Pulmonary-system Quartz Quartz-dust Respiratory-hypersensitivity Respiratory-irritants Safety-measures Silica Silica-dusts Standards Statistical-analysis Work-environment Worker-health X-ray Diffraction

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• ISSN:
  0003-4878
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  Ohio ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DART - Division of Applied Research and Technology
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  53
• Issue:
  6
• NIOSHTIC Number:
  nn:20035820
• Citation:
  Ann Occup Hyg 2009 Aug; 53(6):639-649
• Contact Point Address:
  Peter Stacey, The Health and Safety Laboratory, Harpur Hill, Buxton SK17 9JN, UK
• Email:
  Peter.Stacey@hsl.gov.uk
• CAS Registry Number:
  Silica (CAS RN 7631-86-9)
• Federal Fiscal Year:
  2009
• Peer Reviewed:
  True
• Source Full Name:
  Annals of Occupational Hygiene
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:6c4865d5a4bc436638b591ba54f89a7c1d314e68db3f69ebbaa6ed61dbd3a8eeef564851d87f9a2f98c7599afae2d7fc910de0874d919baa721bbfd641cc0af4
• Download URL:
  https://stacks.cdc.gov/view/cdc/187532/cdc_187532_DS1.pdf
• File Type:
  [PDF - 489.81 KB ]