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ABSENCE OF 14 C IN PM 2.5 EMISSIONS FROM GASOHOL COMBUSTION IN SMALL ENGINES
Citation:
LEWIS, C. W., J. VOLCKENS, J. N. BRADDOCK, W. S. CREWS, W. A. LONNEMAN, AND A. P. MCNICHOL. ABSENCE OF 14 C IN PM 2.5 EMISSIONS FROM GASOHOL COMBUSTION IN SMALL ENGINES. AEROSOL SCIENCE AND TECHNOLOGY. Taylor & Francis, Inc., Philadelphia, PA, 40(9):657-663, (2006).
Impact/Purpose:
The goal of this task is to develop methods and models to reduce the uncertainty in quantifying local and regional air pollutant source impacts on ambient samples collected in speciated PM, air toxic, and semi-continuous measurement networks. A combination of high resolution sampling, organic and inorganic analytical methods, and models will be developed and evaluated to reduce the uncertainty in source apportionment:
(1) semi-continuous inorganic species sampling
(2) inorganic analysis
(3) organic analysis for medium flow samples
(4) multivariate receptor models for ambient samples
(5) regional and local models
In addition, this task contributes to two additional tasks that have research focused on reducing the uncertainty in source apportionment: Identify Sources of Human Exposure (21176), and NAAQS implementation (21179).
Description:
PM2.5 combustion emissions from small engines using ethanol-containing gasoline (gasohol) were analyzed for their 14C content, which was found to be much smaller than in the fuel. This suggests that using 14C measurements on ambient aerosol to estimate the contribution from fossil fuel combustion will be little affected by increased use of gasohol.