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Split Point Analysis and Uncertainty Quantification of Thermal-Optical Organic/Elemental Carbon Measurements
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Towards a Field-Portable Real-Time Organic and Elemental Carbon Monitor.

D A Parks1, K V Raj1, C A Berry1

  • 1CDC NIOSH, Spokane, WA, USA.

Mining, Metallurgy & Exploration
|November 21, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed a new, real-time method using mid-infrared spectrometry to measure diesel particulate matter (DPM) in workplaces. This faster technique improves upon traditional lab analysis, allowing for quicker identification of harmful DPM exposure.

Keywords:
Diesel particulate matterElemental carbonOrganic carbonReal-time monitor

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Area of Science:

  • Occupational Health and Safety
  • Analytical Chemistry
  • Environmental Science

Background:

  • Diesel particulate matter (DPM) is a human carcinogen, necessitating workplace exposure monitoring.
  • Current NIOSH Method 5040 for DPM analysis involves filter collection and lab-based thermal-optical analysis, causing significant delays.
  • These delays hinder timely identification of excessive DPM exposure and can lead to loss of volatile organic carbon components.

Purpose of the Study:

  • To develop a field-portable, real-time method for measuring elemental carbon (EC) and organic carbon (OC) in DPM aerosols.
  • To provide a faster alternative to traditional laboratory analysis for workplace DPM monitoring.
  • To investigate the suitability of mid-infrared spectrometry for real-time DPM analysis.

Main Methods:

  • Investigated the application of mid-infrared spectrometry for DPM analysis.
  • Developed a method to measure both organic carbon (OC) and elemental carbon (EC) in DPM.
  • Validated the method using laboratory-generated aerosols and mine samples across a range of OC/EC ratios.

Main Results:

  • Successfully demonstrated a method for measuring OC and EC in DPM using mid-infrared spectrometry.
  • The developed method is suitable for a broad range of OC/EC ratios.
  • The technique shows promise for real-time, field-portable DPM monitoring.

Conclusions:

  • Mid-infrared spectrometry offers a viable alternative to traditional thermal-optical analysis for real-time DPM monitoring.
  • The new method can significantly reduce the time required for DPM analysis, enabling faster response to potential overexposures.
  • This advancement supports improved worker safety by providing immediate feedback on diesel emissions in occupational settings.