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A larger pool of ozone-forming carbon compounds in urban atmospheres

Nature volume 405, pages 778–781 (2000)Cite this article

Abstract

Volatile organic compounds play a central role in the processes that generate both urban photochemical smog and tropospheric ozone1,2. For successful and accurate prediction of these pollution episodes, identification of the dominant reactive species within the volatile organic carbon pool is needed3. At present, lack of resolution inherent in single-column chromatographic analysis4 limits such a detailed chemical characterization of the complex urban atmosphere. Here we present an improved method of peak deconvolution from double-column (orthogonal) gas chromatography5,6. This has enabled us to isolate and classify more than 500 chemical species of volatile organic compounds in urban air, including over 100 multi-substituted monoaromatic and volatile oxygenated hydrocarbons. We suggest that previous assessments of reactive carbon species may therefore have underestimated the contribution made by volatile organic compounds to urban pollution, particularly for compounds with more than six carbon atoms. Incorporating these species in predictive models should greatly improve our understanding of photochemical ozone yields and the formation of harmful secondary organic aerosols7,8.

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Figure 1: Comprehensive and one-dimensional separations of volatile organic compounds in urban air.
Figure 2: Expanded section of volatile organic compounds in an urban air separation.
Figure 3: Fast second-dimension chromatograms generated from midpoint zone compression in a comprehensive gas chromatography separation.
Figure 4: Comparison of column eluent from concurrent one- and two-dimensional gas chromatography separations monitored by parallel flame ionization detectors.

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Acknowledgements

We thank the UK Engineering and Physical Sciences Research Council and the UK Department of the Environment, Transport and the Regions for financial support. We also acknowledge the support of Hewlett-Packard (Australia), and SGE International (Australia).

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Authors and Affiliations

  1. School of Chemistry,

    Alastair C. Lewis, Nicola Carslaw, Andrew L. Lee, Keith D. Bartle & Michael J. Pilling

  2. School of the Environment, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK

    Alastair C. Lewis

  3. Royal Melbourne Institute of Technology Department of Applied Chemistry, Melbourne, 3001, Victoria, Australia

    Philip J. Marriott, Russel M. Kinghorn & Paul Morrison

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  1. Alastair C. Lewis
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  2. Nicola Carslaw
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Correspondence to Alastair C. Lewis.

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Lewis, A., Carslaw, N., Marriott, P. et al. A larger pool of ozone-forming carbon compounds in urban atmospheres . Nature 405, 778–781 (2000). https://doi.org/10.1038/35015540

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