Tagging Diesel and Residential Oil Furnace Emissions in Roanoke,Virginia, with Enriched Isotopes of Samarium |
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| Authors: | Zhi C Lin John M Ondov W Robert Kelly Paul J Paulsen Robert K Stevens |
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| Institution: | 1. Department of Chemistry and Biochemistry , University of Maryland , College Park , Maryland , USA;2. Chemical Science and Technology Laboratory Technology Administration , National Institute for Standards and Technology , Gaithersburg , Maryland , USA;3. Atmospheric Research and Exposure Assessment Laboratory U.S. Environmental Protection Agency , Research Triangle Park , North Carolina , USA |
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| Abstract: | Stable isotopic tracers were used in Roanoke, Virginia, to tag particulate emissions from diesel trucks and residential oil furnaces, two sources of soot and PAHs which cannot be differentiated on the basis of known constituents. Approximately 1.6 g of enriched 149Sm were used to tag 264 m3 of diesel fuel burned by the city bus and truck fleets; 0.39 g of 150Sm were used to tag 106 m3 of residential heating oil. Picogram amounts of the tracers were determined simultaneously by thermal-ionization mass spectrometry in fine particles collected within the city at signal-to-noise ratios as large as 6000. These results demonstrate the feasibility of tracing particles from multiple combustion sources with stable, separated isotopes. |
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