Characterization of fine aerosol and its inorganic components at two rural locations in New York State
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Samples of PM2.5 were collected to measure the concentrations of its chemical constituents at two rural locations, Potsdam and Stockton, NY from November 2002 to August 2005. These samples were collected on multiple filters at both sites, every third day for a 24-h interval with a speciation network sampler. The Teflo® filters were analyzed for PM2.5 mass by gravimetry, and elemental composition by X-ray fluorescence (XRF). Nylasorb® filters and Teflo® filters were leached with water and analyzed for anions and cations, respectively, by ion chromatography (IC). Fine particulate matter (PM2.5) mass and its inorganic component measurements were statistically characterized, and the temporal behavior of these species were assessed. Over the entire study period, PM2.5 mass concentrations were lower at Potsdam (8.35 μg/m3) than at Stockton (10.24 μg/m3). At both locations, organic matter (OM) was the highest contributor to mass. Sulfate was the second highest contributor to mass at 27.0% at Potsdam, and 28.7% at Stockton. Nitrate contributions to mass of 8.9 and 9.5% at Potsdam and Stockton, respectively, were the third highest. At both locations, fine PM mass exhibited an annual cycle with a pronounced summer peak and indications of another peak during the winter, consistent with an overall increase in the rate of secondary aerosol formation during the summer, and increased partitioning of ammonium nitrate to the particle phase and condensation of other semi-volatiles during the winter, respectively. An ion-balance analysis indicated that at both locations, during the summers as well as in the winters, the aerosol was acidic. Lognormal frequency distribution fits to the measured mass concentrations on a seasonal basis indicated the overall increase in particle phase secondary aerosol (sulfate and SOA) concentrations during the summers compared to the winters at both locations.
KeywordsPM2.5 Potsdam Stockton Mass Crustal elements Ions Lognormal distribution
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- Draxler, R. R., & Rolph, G. D. (2003). HYSPLIT (Hybrid Single-Particle Lagrangian Integrated Trajectory) Model. NOAA Air Resources Laboratory, Silver Spring, MD. Access via NOAA ARL READY Website http://www.arl.noaa.gov/ready/hysplit4.html.
- deNevers, N., Lee, K. W., & Frank, N. H. (1979). Patterns in TSP distribution. Journal of the Air Pollution Control Association, 29, 32–35.Google Scholar
- Hopke, P. K., Liu, W., Han, Y. J., Yi, S. M., Holsen, T. M., Scott, C., & Milligan, M. (2003). Measured summertime concentrations of particulate components, Hg0, and speciated polycyclic aromatic hydrocarbons at rural sites in New York State. Environmental Pollution, 123, 413–425.CrossRefGoogle Scholar
- Natural Resources Canada, Canadian Forest Services (accessed on 07/28/2006) http://www.nrcan.gc.ca/cfs-scf/science/prodserv/firereport/archives_e.php
- Ott, W. (1990). A physical explanation of the log normality of pollutant concentrations. Journal of Air & Waste Management Association, 40, 1378–1383.Google Scholar
- Research Triangle Institute (2003a). Standard operating procedure for PM2.5 anion analysis, environmental & industrial sciences division, research triangle institute, Research triangle Park, NC’ (accessed on 04/23/2006). http://www.epa.gov/ttn/amtic/files/ambient/pm25/spec/anionsop.pdf.
- Research Triangle Institute (2003b). Standard operating procedure for PM2.5 cation analysis, environmental & industrial sciences division, research triangle institute, Research triangle Park, NC’ (accessed on 04/23/2006). http://www.epa.gov/ttn/amtic/files/ambient/pm25/spec/cationsop.pdf.
- Seinfeld, J. H., & Pandis, S. N. (1998). Atmospheric chemistry and physics. New York: Wiley.Google Scholar
- Sunder Raman, R. (2006). Investigation of the nature and behavior of carbonaceous species and source apportionment of ambient particulate matter. Dissertation submitted to the Department of Chemical and Biomolecular Engineering, Clarkson University, Potsdam, NY.Google Scholar
- Sunder Raman, R., & Hopke, P. K. (2006). An ion chromatographic analysis of water-soluble, short-chain organic acids in ambient particulate matter. International Journal of Environmental Analytical Chemistry, 86(10, 20), 767–777 (Note: First author last name misspelt in the journal as Sundar Raman).Google Scholar
- Sunder Raman, R., & Hopke, P. K. (2007). Carbonaceous aerosol at two rural locations in New York State: Characterization and behavior. Journal of Geophysical Research (in press).Google Scholar