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Erik Swietlicki. Photo.

Erik Swietlicki

Professor

Erik Swietlicki. Photo.

Yearly trend of dicarboxylic acids in organic aerosols from south of Sweden and source attribution

Author

  • Murtaza Hyder
  • Johan Genberg
  • Margareta Sandahl
  • Erik Swietlicki
  • Jan Åke Jönsson

Summary, in English

Seven aliphatic dicarboxylic acids (C3-C9) along with phthalic acid, pinic acid and pinonic acid were determined in 35 aerosol (PM10) samples collected over the year at Vavihill sampling station in south of Sweden. Mixture of dichloromethane and methanol (ratio 1:3) was preferred over water for extraction of samples and extraction was assisted by ultrasonic agitation. Analytes were derivatized using N,O-bis(trimethylsilyl)trifluoroacetamide (BSTFA) containing 1% trimethylsilyl chloride and analyzed using gas chromatography/mass spectrometry. Among studied analytes, azelaic acid was found maximum with an average concentration of 6.0 +/- 3.6 ng m(-3) and minimum concentration was found for pimelic acid (1.06 +/- 0.63 ng m(-3)). A correlation coefficients analysis was used for defining the possible sources of analytes. Higher dicarboxylic acids (C7-C9) showed a strong correlation with each other (correlation coefficients (r) range, 0.96-0.97). Pinic and pinonic acids showed an increase in concentration during summer. Lower carbon number dicarboxylic acids (C3-C6) and phthalic acid were found strongly correlated, but showed a poor correlation with higher carbon number dicarboxylic acids (C7-C9), suggesting a different source for them. Biomass burning, vehicle exhaust, photo-oxidation of volatile organic compounds (natural and anthropogenic emissions) were possible sources for dicarboxylic acids. (C) 2012 Elsevier Ltd. All rights reserved.

Department/s

  • Centre for Analysis and Synthesis
  • Department of Physics
  • Nuclear physics
  • MERGE: ModElling the Regional and Global Earth system

Publishing year

2012

Language

English

Pages

197-204

Publication/Series

Atmospheric Environment

Volume

57

Document type

Journal article

Publisher

Elsevier

Topic

  • Meteorology and Atmospheric Sciences

Keywords

  • Dicarboxylic acids
  • Ultrasonic assisted solvent extraction
  • Correlation
  • coefficient
  • Biomass burning
  • Photo-oxidation
  • Phthalic acid
  • Pinonic
  • acid

Status

Published

ISBN/ISSN/Other

  • ISSN: 1352-2310