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E-M:/ Seminar at MSU: Organic Carbon and PM2.5 Sources at Multiple Sites in the Midwestern United States

------------------------------------------------------------------------- Enviro-Mich message from Kirk Riley ------------------------------------------------------------------------- A seminar, open to the public, on air organic carbon and PM2.5 sources in the Midwest will be held on March 1 at MSU. If you plan to attend, please notify Lori Hasse at hasse@egr.msu.edu no later than February 26, 2007.

Thursday, March 1, 2007
4:10pm – 5:00pm
2320 Engineering Building
Refreshments Provided

Dr. Birnur Buzcu-Guven
Assistant Professor
Department of Civil and Environmental Engineering
Michigan State University

Analysis and Apportionment of Organic Carbon and PM2.5 Sources at
Multiple Sites in the Midwestern United States

Speciated PM2.5 data collected as part of the Speciation Trends Network
(STN) at four sites in the Midwest (Detroit, Michigan; Cincinnati, Ohio;
Indianapolis, Indiana; and Northbrook, Illinois) and as part of the
Interagency Monitoring of Protected Visual Environments (IMPROVE)
program at the rural Bondville, Illinois, site were analyzed to
understand sources contributing to organic carbon (OC) and PM2.5 mass.
Positive matrix factorization (PMF) was applied to available data
collected from January 2002 through March 2005 and seven to nine factors
were identified at each site. Common factors at all sites included
mobile (gasoline)/SOA with high OC, diesel with a high elemental carbon
(EC)/OC ratio (only at the urban sites), secondary sulfate, secondary
nitrate, soil, and biomass burning. Identified industrial factors
included copper smelting (Northbrook, Indianapolis, Bondville),
steel/manufacturing with iron (Northbrook), industrial zinc (Northbrook,
Cincinnati, Indianapolis, Detroit), metal plating with chromium and
nickel (Detroit, Indianapolis, Bondville), mixed industrial with copper
and iron (Cincinnati) and limestone with calcium and iron (Bondville).
PMF results, on average, accounted for 96% of the measured PM2.5 mass at
each site. Potential source contribution function (PSCF) analysis helped
identify regional and local impacts of the identified source types.
Secondary sulfate and soil factors showed regional characteristics at
each site while industrial sources typically appeared to be locally
influenced. These regional factors contributed about a third of the
total PM2.5 mass, on average, while local mobile and industrial sources
contributed to the remaining mass. Mobile sources were a major
contributor (55% to 76% at the urban sites) to OC mass, generally with
at least twice as much mass from non-diesel sources as from diesel.
Regional OC associated with secondary sulfate and soil was generally low.

Sponsored by the Department of Civil and Environmental Engineering, MSU
Spring 2007 Environmental Engineering seminar series

For further information please contact Dr. Volodymyr Tarabara,
Department of Civil and Environmental Engineering at tarabara@egr.msu.edu

Accommodations for persons with disabilities may be requested by
contacting Lori Hasse (hasse@egr.msu.edu)
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