Preliminary Field Study to Evaluate Two Thermal Correction Methods for Removing VOC Interference from DPM Sample Analysis

Details

• Personal Author:
  Guse PM ; Keles C ; Sarver E
• Description:
  Diesel particulate matter (DPM) is the solid portion of diesel exhaust. In underground mines prone to high DPM concentrations for prolonged time periods, exposures can be hazardous. For monitoring, filter samples are often collected and subject to thermal-optical analysis to measure the two primary components of DPM: elemental (EC) and particulate organic carbon (POC). However, the presence of volatile organic carbon (VOC) can interfere. The standard approach to correcting for VOC is use of a "dynamic blank" filter, but errors have been reported. Alternative approaches have also been proposed, including pre-baking samples to drive off VOC before typical thermal-optical analysis, or addition of low temperature isotherm(s) to the beginning of the analysis routine for the same purpose. As a preliminary study, these simple thermal correction methods were compared to the standard correction using field samples collected in three locations (two in an underground mine, one at a highway truck stop). The pre-baking method (at 175 degrees C) was found to overcorrect for VOC, resulting in underestimation of POC. Efficacy of the modified thermal-optical analysis (with addition of an initial isotherm at 175 degrees C) appeared to be dependent on sample mass and/or composition. [Description provided by NIOSH]
• Subjects:
  Air Pollutants, Occupational Air Pollution Mining Occupational Health Particulate Matter Safety Ventilation
• Keywords:
  Airborne Particulates Air Quality Monitoring Diesel Exhaust Filter Materials Filters Mining Industry Monitoring Systems Particulates Underground Mining
• ISBN:
  9781032036793
• Publisher:
  CRC Press
• 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:
  105-114
• NIOSHTIC Number:
  nn:20063575
• Citation:
  Mine Ventilation: Proceedings of the 18th North American Mine Ventilation Symposium (NAMVS 2021), June 12-17, 2021, Rapid City, South Dakota. Tukkaraja P ed. London: CRC Press, 2021 Jun; :105-114
• CAS Registry Number:
  Carbon (CAS RN 7440-44-0)
• Editor(s):
  Tukkaraja P
• Federal Fiscal Year:
  2021
• Performing Organization:
  Virginia Tech
• Peer Reviewed:
  False
• Start Date:
  20140901
• Source Full Name:
  Mine Ventilation: Proceedings of the 18th North American Mine Ventilation Symposium (NAMVS 2021), June 12-17, 2021, Rapid City, South Dakota
• End Date:
  20190831
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:5919f4a9bf7f2e3d4645a7fb58e70e908ec1a162dceb1b47a9e6dde1501c8afe5096e7aeb25f2da44168d9ce676e456802bd15f9db13b0cc26dbe77e0b5a1d79
• Download URL:
  https://stacks.cdc.gov/view/cdc/222160/cdc_222160_DS1.pdf
• File Type:
  [PDF - 810.74 KB ]