Formation of oxidized products from the reaction of gaseous phenanthrene with the OH radical in a reaction chamber

Ji Yi Lee, Douglas A. Lane

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57 Scopus citations

Abstract

The reaction of gas phase phenanthrene (Phen) with the OH radical in the presence of NOx was studied in a reaction chamber. A number of oxidation products were identified by two dimensional gas chromatography-time of flight mass spectrometry (GC × GC-TOFMS). Identified products included 9-fluorenone, 1,2-naphthalic anhydride, 2,2'-diformylbiphenyl, dibenzopyranone, 1, 2, 3, 4 and 9-phenanthrols, 2, 3, 4 and 9-nitrophenanthrenes, 1,4-phenanthrenequinone, 9,10-phenanthrenequinone, and 2- and 4-nitrodibenzopyranones. This is the first study to identify 1,2-naphthalic anhydride and 1,4-phenanthrenequinone as products of the gas phase reaction of Phen with the OH radical. Eight more products were tentatively identified by their mass spectral fragmentation patterns and based on the typical OH radical initiated photochemical reaction mechanisms of simple aromatic compounds and naphthalene. In the reaction chamber, particle formation of products as a function of irradiation time was measured. Phenanthrenequinones, phenanthrol, nitrophenanthrene and nitrobenzopyranone were observed predominantly in the particle phase. This implies that these oxidized products formed from the reaction of Phen with the OH radical in the chamber would be associated with particles in the atmosphere and may, therefore, have an impact on human health. Possible pathways for the formation of these products are suggested and discussed.

Original languageEnglish
Pages (from-to)2469-2477
Number of pages9
JournalAtmospheric Environment
Volume44
Issue number20
DOIs
StatePublished - Jun 2010

Keywords

  • OH radical reaction
  • Oxidized products
  • Particle formation
  • Phenanthrene

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