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Main Title Analysis of carbonaceous aerosols using the thermal optical transmittance and thermal optical reflectance methods /
Author Norris, Gary, ; Norris, Gary A. ; Birch, M. E. ; Tolocka, M. P. ; Lewis, C. W. ; Solomon, P. A.
Other Authors
Author Title of a Work
Tolocka, Michael P.
Lewis, Charles W.
Solomon, Paul A.
Homolya, James B.
CORP Author Environmental Protection Agency, Research Triangle Park, NC. National Exposure Research Lab. ;National Inst. for Occupational Safety and Health, Cincinnati, OH.
Publisher U.S. Environmental Protection Agency, National Environmental Research Laboratory,
Year Published 1999
Report Number EPA/600/R-99/059; NERL-RTP-0-647
Stock Number PB99-171597
Additional Subjects Carbonaceous materials ; Aerosols ; Methods ; Particulates ; Quantitative analysis ; Heating filters ; Carbon volatization ; Thermal optical transmittance ; Thermal optical reflectance
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
NTIS  PB99-171597 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 14 pages : illustrations ; 28 cm
Carbonaceous particulate typically represents a large fraction of PN25 (20-40%). Two primary techniques presently used for the analysis of particulate carbon are Thermal Optical Transmission (TOT-NIOSH Method 5040) and Thermal Optical Reflectance (TOR). These two methods both quantify carbon by heating filters and volatilizing the carbon that is oxidized in a granular bed of MnO2 reduced to CH4 in a Ni methanator, and quantified as CH4 with a flame ionization detector. However, the methods use different techniques to correct for the formation of pyrolysis products and the temperature programs for defining organic and elemental carbon. The TOT and TOR measurement techniques are being compared using samples from the Chemical Speciation Monitor Evaluation Field Study. All of the samples will be measured with TOR and a subset of samples representing a range of mass concentrations will be measured with TOT. This comparison will provide insight into the effect of the measurement technique parameters on organic and elemental carbon concentrations.
"EPA/600/R-99/059." "PB99-171597." Includes bibliographical references. Microfiche.