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Airborne haloacetic acids.

Jonathan W Martin1, Scott A Mabury, Charles S Wong

  • 1Department of Environmental Biology, University of Guelph, Bovey Building, Guelph, Ontario, Canada N1G 2W1. jmartin@chem.utoronto.ca

Environmental Science & Technology
|July 24, 2003
PubMed
Summary
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Airborne haloacetic acids (HAAs) were studied in Ontario, with monochloroacetic acid being dominant. Concentrations varied by site and season, with HAAs mostly in the gas phase, though particle association increased in colder months.

Area of Science:

  • Environmental Chemistry
  • Atmospheric Science
  • Analytical Chemistry

Background:

  • Haloacetic acids (HAAs) are a group of organic compounds found in the atmosphere.
  • Understanding their sources and behavior is crucial for assessing environmental impact.

Purpose of the Study:

  • To investigate the sources and gas-particle partitioning of airborne HAAs.
  • To compare HAA concentrations and behavior between urban and semi-rural sites.

Main Methods:

  • Air samples collected using denuders for gaseous HAAs and quartz filters for particle-bound HAAs.
  • Analysis of individual HAA concentrations (MCA, DCA, TFA, TCA, DFA, MFA, CDFA).
  • Statistical analysis to correlate HAA levels with environmental factors.

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Main Results:

  • Monochloroacetic acid (MCA) was the most abundant HAA.
  • Trifluoroacetic acid (TFA) and trichloroacetic acid (TCA) concentrations were higher in the urbanized Toronto site.
  • HAAs were predominantly in the gas phase, but particle-phase fraction increased during colder months.
  • Trichloroacetic acid exhibited the highest particle fraction.

Conclusions:

  • Environmental factors like temperature, radiation, and PM10 influence HAA concentrations and partitioning.
  • Dry deposition of TFA and TCA is significant in temperate regions.
  • Henry's law constant can predict HAA precipitation concentrations.