14th EuCheMS International Conference on Chemistry and the Environment (ICCE 2013, Barcelona, June 25 - 28, 2013)

Environmental Science and Pollution Research

, Volume 21, Issue 20, pp 11649-11660

On the origin of water-soluble organic tracer compounds in fine aerosols in two cities: the case of Los Angeles and Barcelona

  • M. AlierAffiliated withDepartment of Environmental Chemistry, Institute for Environmental Assessment and Water (IDAEA-CSIC)
  • , M. Dall OstoAffiliated withInstitut de Ciències del Mar (ICM-CSIC)
  • , Y.-H. LinAffiliated withDepartment of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina
  • , J. D. SurrattAffiliated withDepartment of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina
  • , R. TaulerAffiliated withDepartment of Environmental Chemistry, Institute for Environmental Assessment and Water (IDAEA-CSIC)
  • , J. O. GrimaltAffiliated withDepartment of Environmental Chemistry, Institute for Environmental Assessment and Water (IDAEA-CSIC)
  • , B. L. van DroogeAffiliated withDepartment of Environmental Chemistry, Institute for Environmental Assessment and Water (IDAEA-CSIC) Email author 

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Abstract

Water-soluble organic compounds (WSOCs), represented by anhydro-saccharides, dicarboxylic acids, and polyols, were analyzed by gas chromatography interfaced to mass spectrometry in extracts from 103 PM1 and 22 PM2.5 filter samples collected in an urban background and road site in Barcelona (Spain) and an urban background site in Los Angeles (USA), respectively, during 1-month intensive sampling campaigns in 2010. Both locations have similar Mediterranean climates, with relatively high solar radiation and frequent anti-cyclonic conditions, and are influenced by a complex mixture of emission sources. Multivariate curve resolution-alternating least squares analyses were applied on the database in order to resolve differences and similarities in WSOC compositions in the studied sites. Five consistent clusters for the analyzed compounds were obtained, representing primary regional biomass burning organic carbon, three secondary organic components (aged SOC, isoprene SOC, and α-pinene SOC), and a less clear component, called urban oxygenated organic carbon. This last component is probably influenced by in situ urban activities, such as food cooking and traffic emissions and oxidation processes.

Keywords

PM WSOC Secondary organic aerosol Dicarboxylic acids Anhydro-saccharides