Atmospheric Aerosol over a Southeastern Region of Texas: Chemical Composition and Possible Sources |
| |
| Authors: | Paul Chiou Wei Tang Che-Jen Lin Hsing-Wei Chu T C Ho |
| |
| Institution: | (1) Department of Mathematics, Lamar University, Box 10047, Beaumont, TX 77710, USA;(2) Department of Chemical Engineering, Lamar University, Box 10053, Beaumont, TX 77710, USA;(3) Department of Civil Engineering, Lamar University, Box 10024, Beaumont, TX 77710, USA;(4) Department of Mechanical Engineering, Lamar University, Box 10028, Beaumont, TX 77710, USA |
| |
| Abstract: | Speciated samples of PM2.5 were collected at a site in Jefferson County, Texas by US EPA (Environmental Protection Agency) from July of 2003 to August
of 2005. A total of 269 samples with 52 species were measured; however, 22 species were excluded in this study because of
too many below-detection-limit data. The data set was analyzed by positive matrix factorization (PMF) to infer the sources
of PM observed at the site. The analysis identified ten sources: sulfate-rich secondary aerosol I (35.9%), sulfate-rich secondary
aerosol II (21.0%), cement/carbon-rich (11.7%), wood smoke (8.8%), metal processing (6.3%), motor vehicle/road dust (5.7%),
nitrate-rich secondary aerosol (3.3%), soil (3.2%), sea salt (2.6%), and chloride depleted marine aerosol (1.6%). Sulfate
and nitrate mainly exist as salts. The two sulfate-rich secondary aerosols account for almost 57% of the PM2.5 mass concentration. The factor containing highest concentrations of Cl and Na was attributed to sea salt due to the proximity
of the monitoring site to the Gulf of Mexico. The chloride depleted marine aerosol was related to the sea salt aerosol. Cement/carbon-rich,
wood smoke, metal processing, and motor vehicle/road dust factor were likely to be the local sources. |
| |
| Keywords: | Airborne particulate matter PM Positive matrix factorization Receptor modeling Factor contribution Factor profiles |
| 本文献已被 SpringerLink 等数据库收录！ |
|
