VOC Interference in DPM Sample Analysis: Sampling Materials as Possible VOC Sources

Details

• Personal Author:
  Guse P ; Sarver E
• Description:
  Diesel particulate matter (DPM) is monitored in some occupational environments, including mines, by measuring its primary components: elemental (EC) and organic carbon (OC). While EC only occurs in the solid phase, OC can occur in both the solid and gas phases. The latter is termed volatile OC or VOC. Aside from diesel exhaust, there can be a variety of sources that contribute VOC to DPM samples, including the sampling materials themselves. Regardless of the source, VOC presents analytical interference for particulate OC measurements. To correct, a tandem-filter approach is often used whereby a primary filter should collect both OC phases, while a secondary filter beneath only collects the VOC; then, a simple difference between primary and secondary filter results is used to determine particulate OC. However, anecdotal observations of higher OC on the secondary filter indicate that, in some cases, VOC might preferentially sorb to the secondary filter. This leads to underestimation of the particulate OC, which in some cases can even appear negative. One possibility is that sampling material-sourced VOC could produce such an artifact. To explore, three existing datasets containing both blank filters and field and lab DPM samples were examined to look for instances and conditions surrounding higher secondary than primary filter OC. Then, a follow-up study was conducted to investigate the relative VOC contribution to blank filters by standard materials used for mine sampling. Testing was done under both hot and cold storage conditions. [Description provided by NIOSH]
• Subjects:
  Mining Occupational Health Particulate Matter Safety Ventilation
• Keywords:
  Diesel Exhaust Filters Mining Industry Particulates Particulate Sampling Methods
• Publisher:
  Society for Mining, Metallurgy, and Exploration, Inc.
• Document Type:
  Text
• Funding:
  Contract
• Genre:
  Proceedings
• Place as Subject:
  OSHA Region 3 ; Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-7
• NIOSHTIC Number:
  nn:20068398
• Citation:
  2019 SME Annual Meeting, February 24-27, 2019, Denver, Colorado, preprint 19-154. Englewood, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2019 Feb; :1-7
• Federal Fiscal Year:
  2019
• Performing Organization:
  Virginia Tech
• Peer Reviewed:
  False
• Start Date:
  20140901
• Source Full Name:
  2019 SME Annual Meeting, February 24-27, 2019, Denver, Colorado, preprint 19-154
• End Date:
  20190831
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:60005e681bb3d8a3736bf1f59a9e53d144e96eb315cd436c639cae632d0b64631505435391651a0ea64ba908405cba4ce403d7c27f561546aa5fbab6e1abbf61
• Download URL:
  https://stacks.cdc.gov/view/cdc/230557/cdc_230557_DS1.pdf
• File Type:
  [PDF - 636.06 KB ]