Detection of known photochemical decomposition products of PAH in particulate matter from pollution episodes in Seoul, Korea

Douglas A. Lane, Jiyi Lee

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Over the past two decades, significant efforts have been expended to identify the photochemical decomposition products of the OH radical reactions of various polycyclic aromatic compounds (PAC), such as naphthalene, methylnaphthalenes, acenaphthene and phenanthrene (1-7). Although these parent PAC are predominantly found in the gas phase, many of their oxidation products have been found largely in the particle phase (4, 7, 8). These products include diones, hydroxy-, and nitrated products as well as many products resulting from ring-opening steps. It is, or should be, the goal of every laboratory study on atmospheric processes to apply the laboratory results to real world samples. To this end, we have obtained particulatematter air samples, as well as some smog episode samples, from Seoul Korea and have searched for the known decomposition products of the above mentioned PAC. To eliminate the use of chlorinated solvents used in the extraction and analysis of particulate matter samples, we have been utilizing the direct thermal desorption of small (4 mm diameter) punches of filters followed by Multidimensional Gas Chromatography-Time of Flight Mass Spectrometry (TD-GCxGC-TOFMS) for the analysis of the desorbed compounds. So far, we have detected 14 of the known decom positionproducts of naphthalene, acenaphthene and phenanthrene in the Seoul pollution episode samples. These include: 1-hydroxynaphthalene, (E) 2-formylcinnamaldehyde, phthalic anhydride, phthalide, 1,2-naphthalic anhydride, 9-hydroxyphenanthrene and dibenzopyrone.

Original languageEnglish
Pages (from-to)309-320
Number of pages12
JournalPolycyclic Aromatic Compounds
Volume30
Issue number5
DOIs
StatePublished - Oct 2010

Bibliographical note

Funding Information:
Received 6 November 2009; accepted 20 May 2010 The research reported herein was internally funded by Environment Canada. This work was, also, supported by the National Research Foundation of Korea (NRF) grant (No. 2009-0066341) funded by the Korea government (MEST). Address correspondence to Douglas A. Lane, Environment Canada, Science and Technology Branch, 4905 Dufferin Street, Toronto, M3H 5T4, Canada. E-mail: douglas. lane@ec.gc.ca

Keywords

  • Gas phase
  • OH radical
  • Oxidents
  • Particle phase
  • Polycyclic aromatic compounds
  • Seoul

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