Molecular composition and compound-specific stable carbon isotope ratio of polycyclic aromatic hydrocarbons (PAHs) in the atmosphere in suburban areas

Tomoaki Okuda, Hidetoshi Kumata, Hiroshi Naraoka, Hideshige Takada

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Molecular and carbon isotopic compositions of atmospheric polycyclic aromatic hydrocarbons (PAHs) were measured in sites at 1 m (S1), 10 m (S2) and approximately 200 m (S3) distant from roads in Tokyo. Japan. Total suspended particles (TSP) concentrations at S1 was approximately three times higher than S2 and S3, while the concentration of atmospheric PAHs was almost the same (76-166, μg g-1-TSP) at S1, S2 and S3. Compound-specific δ13C of atmospheric PAHs ranged from -23.3 to -24.5‰ at S1, from -24.1 to -25.6‰ at S2, and from -25.2 to -27.0‰ at S3. The concentration of some PAHs and the weighted averages of δ13C of some selected PAHs differed significantly among the three sites. The PAH concentration ratios indicating automotive contribution were S1 > S2 > S3, while the ratios indicating non-vehicle contribution were S3 > S2 > S1. These differences in molecular and isotopic signatures among the three sites are not caused by photolysis, instead they are possibly due to differences in the sources of PAHs. A quantitative approach to identify compound-specific sources is to use the concentration and δ13C of individual PAHs at each site. The estimated average δ13C values of individual PAHs derived from automobiles, which was calculated using a mass balance model, ranged from -19.5 to -23.6‰. Taking into account the results of this study and those of previous studies, -26 to -28‰ was adopted as the δ13C value of PAHs derived from non-vehicle sources. We estimated that the automotive contribution to the concentration of individual PAHs ranged from 33 to 88% at S1, from 11 to 74% at S2, and from 0 to 52% at S3. We conclude that compound-specific δ13C measurement is a powerful and useful tool to identify such compound-specific sources of atmospheric PAHs.

Original languageEnglish
Pages (from-to)89-100
Number of pages12
JournalGeochemical Journal
Volume38
Issue number1
DOIs
Publication statusPublished - Jan 1 2004
Externally publishedYes

Fingerprint

suburban areas
Carbon Isotopes
carbon isotopes
carbon isotope ratio
suburban area
Polycyclic Aromatic Hydrocarbons
isotope ratios
polycyclic aromatic hydrocarbons
PAH
stable isotope
atmospheres
atmosphere
Chemical analysis
mass balance
automobiles
Photolysis
photolysis
roads

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Cite this

Molecular composition and compound-specific stable carbon isotope ratio of polycyclic aromatic hydrocarbons (PAHs) in the atmosphere in suburban areas. / Okuda, Tomoaki; Kumata, Hidetoshi; Naraoka, Hiroshi; Takada, Hideshige.

In: Geochemical Journal, Vol. 38, No. 1, 01.01.2004, p. 89-100.

Research output: Contribution to journalArticle

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