Carbon kinetic isotope effects in the gas‐phase reactions of aromatic hydrocarbons with the OH radical at 296 ± 4 K

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  • Richard Iannone
    Centre for Atmospheric Chemistry and Chemistry Department York University Toronto Canada
  • Rebecca S. Anderson
    Centre for Atmospheric Chemistry and Chemistry Department York University Toronto Canada
  • Alexandra E. Thompson
    Centre for Atmospheric Chemistry and Chemistry Department York University Toronto Canada
  • Jochen Rudolph
    Centre for Atmospheric Chemistry and Chemistry Department York University Toronto Canada
  • Lin Huang
    Meteorological Service of Canada Toronto Canada

Bibliographic Information

Published
2004-08
Rights Information
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2004gl020089
Publisher
American Geophysical Union (AGU)

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<jats:p>The carbon kinetic isotope effects (KIEs) of the room temperature reactions of benzene and several light alkyl benzenes with OH radicals were studied in a reaction chamber at ambient pressure using gas chromatography coupled with online combustion and isotope ratio mass spectrometry (GCC‐IRMS). The KIEs are reported in per mil according to ɛ (‰) = (KIE − 1) × 1000, where KIE = <jats:italic>k</jats:italic><jats:sub>12</jats:sub>/<jats:italic>k</jats:italic><jats:sub>13</jats:sub>. The following average KIEs were obtained, (all in ‰): benzene 7.53 ± 0.50; toluene 5.95 ± 0.28; ethylbenzene 4.34 ± 0.28; <jats:italic>o</jats:italic>‐xylene 4.27 ± 0.05, <jats:italic>p</jats:italic>‐xylene 4.83 ± 0.81; <jats:italic>o</jats:italic>‐ethyltoluene 4.71 ± 0.12 and 1,2,4‐trimethylbenzene 3.18 ± 0.09. Our KIE value for benzene + OH agrees with the only reported value known to us [<jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#grl18397-bib-0009"><jats:italic>Rudolph et al.</jats:italic>, 2000</jats:ext-link>]. It is shown that measurements of the stable carbon isotope ratios of light aromatic compounds should be extremely useful to study atmospheric processing by the OH radical.</jats:p>

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