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Characterization of Ambient PM2.5 Aerosol at a Southeastern US Site: Fourier Transform Infrared Analysis or Particle Phase

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Abstract: During a field study in the summer of 2000 in the Research Triangle Park (RTP), aerosol samples were collected using a five stage cascade impactor and subsequently analyzed using Fourier Transform Infrared Spectroscopy (FTIR). The impaction surfaces were stainless steel disks. The FTIR analysis involved a unique technique in which the impactor disks were examined, first, by reflectance, followed by attenuated total reflectance (ATR) analysis of solvent extracts of the deposits on the disks. In the ATR analysis, each disk was rinsed with a few microliters of hexane, acetone, ethanol, and water, respectively. Each solvent rinse was added to a horizontal ATR where the solvent was allowed to dry and the residue analyzed. Results from the study of the aerosol at this site show that the aerosol consists overwhelmingly of polar constituents. Carbonyls were a major constituent of the organic fraction while ammonium sulfate predominated in the inorganic fraction of the aerosol. This poster presentation will explain the analysis procedure in detail and will report on the results of the 2000 field study.

This work has been funded wholly by the United States Environmental Protection Agency. It has been subject to Agency review and approved for publication.
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Citation:Weathers, W. S. Characterization of Ambient PM2.5 Aerosol at a Southeastern US Site: Fourier Transform Infrared Analysis or Particle Phase. Presented at American Association of Aerosol Research, Charlotte, NC, October 7-11, 2002.
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Contact: Liz Hope - (919) 541-2785 or hope.elizabeth@epa.gov
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Division: Human Exposure & Atmospheric Sciences Division
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Branch: Methods Development & Application Branch
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Product Type: Exhibit
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Presented: 10/07/2002
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Related Entries:
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Bullet Item Science Version of PM Chemistry Model
spacer Relationship Reason:   A Project of the Product
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Last Updated on Monday, October 22, 2007
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