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The mean concentration and chemical reactivity of VOCs of typical processes over Pearl River Delta Region |
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Abstract The diurnal features of VOCs in relative pollution and clean processes in autumn over Pearl River Delta (PRD) are analyzed. The mass concentration of VOCs under pollution circumstances can be 2.2 times as high as that with clean process. Contributed to pollution enrichment are the pollutants of toluene, xylene, ethylbenzene, butane, pentane, propane, acetylene and ethane, etc. The isoprene emitted from nature has the diurnal features of lower concentration in the morning and evening versus higher concentration during daytime, indicating characteristics of botanic photosynthesis, while toluene from anthropogenic emission has the diurnal features which basically reveal the effects of diurnal changes of meteorological condition and source emission, with obvious pollution enrichment in the morning and lower concentration in the afternoon under relative pollution circumstances. Relatively more active reactivity pollutants include alkene (trans-2-butene, isoprene, cis-2-pentene) and aromatic hydrocarbon (m/p-xylene, toluene), of which alkene has the lowest mass percentage while having the highest chemical reactivity percentage.
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Received: 12 January 2010
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