Objective To study composition and source of atmospheric volatile organic compounds (VOCs) in downtown area of Shanghai, and to provide early warning and indication of regional ecological unbalance, resource overloading and environmental pollution aggravation.
Methods Preconcentration and gas chromatography-mass selective detector (GC-MS) were used to analyze atmospheric VOCs in Xuhui District of Shanghai.
Results A total of 102 VOCs components were detected. The average volume fraction of VOCs was 46.39& #215;10-9, and the common components were alkanes (50.2%), olefins (6.8%), aromatic hydrocarbons (22.8%), alkynes (7.5%), and others (12.7%, including alcohol, aldehyde, ketone, ester and ether). Among the identified compositions, 79 were poisonous and harmful. The common hazardous components were benzene hydrocarbon, halogenated aromatic hydrocarbon and alkane, of which toluene was of highest concentration.
Conclusion The VOCs in Xuhui District is mainly contributed by traffic vehicles. VOCs pollution is most serious in winter vis-& #224;-vis least serious in autumn.
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