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Thermal Measurement Techniques in Analytical Microfluidic Devices
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Evaluation of Thermal Optical Analysis (TOA) using an aqueous binary mixture.

Courtney D Grimes1, Joseph M Conny2, Russell R Dickerson1,3

  • 1Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742.

Atmospheric Environment (Oxford, England : 1994)
|March 22, 2024
PubMed
Summary
This summary is machine-generated.

This study presents a new method for characterizing Thermal-Optical Analysis (TOA) using an aqueous mixture of organic carbon (OC) and elemental carbon (EC). The method accurately quantifies carbon components in atmospheric particulate matter.

Keywords:
Black carbonTOTelemental carbonorganic carbon aerosolthermal optical transmission analysis

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Atmospheric Chemistry

Background:

  • Thermal-Optical Analysis (TOA) is a standard technique for measuring organic carbon (OC) and elemental carbon (EC) in particulate matter.
  • Accurate characterization of TOA methods is crucial for reliable atmospheric carbon measurements.
  • Existing methods may require complex sample preparation or lack precision in distinguishing carbon fractions.

Purpose of the Study:

  • To develop and validate a novel method for characterizing the Thermal-Optical Analysis (TOA) transmission technique.
  • To assess the accuracy and reproducibility of TOA measurements using a prepared aqueous mixture of EC and OC.
  • To evaluate different temperature protocols for their effectiveness in quantifying carbonaceous aerosols.

Main Methods:

  • An aqueous binary mixture containing known amounts of elemental carbon (EC) and organic carbon (OC) was prepared.
  • The mixture was deposited onto quartz-fiber filters using a low-volume deposition technique.
  • Samples were analyzed using Thermal-Optical Analysis (TOA) with various temperature protocols, including the NIST-EPA-C protocol.

Main Results:

  • The NIST-EPA-C temperature protocol achieved agreement with reference values better than 2% for EC, OC, total carbon (TC), and EC/TC.
  • All tested temperature protocols indicated total carbon (TC) within 5% of the reference value.
  • All protocols reproduced EC/TC ratios with an uncertainty of less than 10%.

Conclusions:

  • The developed aqueous mixture method provides a reliable and accurate way to characterize TOA instruments.
  • The NIST-EPA-C protocol demonstrates high accuracy for quantifying EC and OC in atmospheric samples.
  • This method enhances the precision and reliability of atmospheric carbonaceous aerosol analysis.