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Issue 24, 2013
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Chemical reactivity and long-range transport potential of polycyclic aromatic hydrocarbons – a review

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Abstract

Polycyclic aromatic hydrocarbons (PAHs) are of considerable concern due to their well-recognised toxicity and especially due to the carcinogenic hazard which they present. PAHs are semi-volatile and therefore partition between vapour and condensed phases in the atmosphere and both the vapour and particulate forms undergo chemical reactions. This article briefly reviews the current understanding of vapour–particle partitioning of PAHs and the PAH deposition processes, and in greater detail, their chemical reactions. PAHs are reactive towards a number of atmospheric oxidants, most notably the hydroxyl radical, ozone, the nitrate radical (NO3) and nitrogen dioxide. Rate coefficient data are reviewed for reactions of lower molecular weight PAH vapour with these species as well as for heterogeneous reactions of higher molecular weight compounds. Whereas the data for reactions of the 2–3-ring PAH vapour are quite extensive and generally consistent, such data are mostly lacking for the 4-ring PAHs and the heterogeneous rate data (5 and more rings), which are dependent on the substrate type and reaction conditions, are less comprehensive. The atmospheric reactions of PAH lead to the formation of oxy and nitro derivatives, reviewed here, too. Finally, the capacity of PAHs for long range transport and the results of numerical model studies are described. Research needs are identified.

Graphical abstract: Chemical reactivity and long-range transport potential of polycyclic aromatic hydrocarbons – a review

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Publication details

The article was received on 26 Apr 2013 and first published on 30 Sep 2013


Article type: Review Article
DOI: 10.1039/C3CS60147A
Citation: Chem. Soc. Rev., 2013,42, 9333-9391
  • Open access: Creative Commons BY license
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    Chemical reactivity and long-range transport potential of polycyclic aromatic hydrocarbons – a review

    I. J. Keyte, R. M. Harrison and G. Lammel, Chem. Soc. Rev., 2013, 42, 9333
    DOI: 10.1039/C3CS60147A

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