A larger pool of ozone-forming carbon compounds in urban atmospheres
A larger pool of ozone-forming carbon compounds in urban atmospheres
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DOI：
10.1038/35015540
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发表时间：
2000-06-15
期刊：
影响因子：
64.8
通讯作者：
Pilling, MJ
中科院分区：
文献类型：
--
作者：
Lewis, AC;Carslaw, N;Pilling, MJ
挥发性有机化合物在产生城市光化学烟雾和对流层臭氧的过程中发挥核心作用(1，2)。为了成功和准确地预测这些污染事件，需要确定挥发性有机碳库中的主要活性物种(3)。目前，单柱层析固有的分辨率(4)的缺乏限制了对复杂城市大气的如此详细的化学表征。本文提出了一种改进的双柱(正交)气相色谱(5，6)的峰去卷积方法。这使得我们能够分离和分类城市空气中500多种挥发性有机化合物的化学物种，包括100多种多取代单芳烃和挥发性含氧碳氢化合物。因此，我们认为，以前对活性碳物种的评估可能低估了挥发性有机化合物对城市污染的贡献，特别是对于碳原子以上的化合物。将这些物种纳入预测模型将大大提高我们对光化学臭氧产量和有害二次有机气溶胶形成的理解(7，8)。
Volatile organic compounds play a central role in the processes that generate both urban photochemical smog and tropospheric ozone(1,2). For successful and accurate prediction of these pollution episodes, identification of the dominant reactive species within the volatile organic carbon pool is needed(3). At present, lack of resolution inherent in single-column chromatographic analysis(4) 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 chromatography(5,6). 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 aerosols(7,8).