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ABSENCE OF 14C IN PM 2.5 EMISSIONS FROM GASOHOL COMBUSTION IN SMALL ENGINES
Citation:
LEWIS, C. W., J. VOLCKENS, J. N. BRADDOCK, W. S. CREWS, AND W. A. LONNEMAN. ABSENCE OF 14C IN PM 2.5 EMISSIONS FROM GASOHOL COMBUSTION IN SMALL ENGINES. Presented at 24th Annual Annual Conference of the American Association of Aerosol Research, Austin, TX, October 17 - 21, 2005.
Impact/Purpose:
(1) Determine contribution of biogenic sources to PM2.5 at representative U.S. sites and seasons via 14C ambient measurements.
(2) Investigate effect of (biogenic) ethanol-containing fuel on 14C estimates of mobile source-caused ambient PM2.5, anticipating greater future use of ethanol as a gasoline additive.
(3) Use 14C as a validation tool for CMAQ simulations and proposed biogenic SOA molecular tracers.
(4) Experimentally characterize monolith organic denuders for possible use in minimizing positive organic artifact in carbonaceous aerosol sampling.
Description:
The amounts of C-14 measured in PM2.5 emissions samples from small engines using gasohol (10% ethanol + 90% gasoline), were much less than that present in the fuel. This suggests that the current method of using C-14 measurements on ambient samples to estimate the contribution from fossil fuel combustion will be little affected by increased use of gasohol.