Ambient concentrations of 98 volatile organic compounds (VOCs) species were measured continuously at Dingling (DL, background site), Dongsi (DS, urban site) and Yongledian (YLD, southeast regional transmission site) in Beijing for one year in 2014, to better understand the characterization of VOCs and their role in chemical reactivity in Beijing. The annual concentration of VOCs in Beijing was (47.36±13.78)×10-9, with alkanes as the most abundant group (39.55%), followed by oxygenated VOCs (OVOCs), and then alkenes and aromatics. The VOCs concentrations at DS and YLD were much higher than those at DL. DS was heavily influenced by vehicular emissions and the usage of LPG/NG, YLD had great contribution of vehicular emissions, paint and solvent evaporation, while DL had more influence of urban pollution transportation. The seasonal variation of VOCs showed maximum in winter and minimum in summer. Because of the different emission sources, VOCs species at 3 sites exhibited different diurnal variations. The ratios of T/B (toluene/benzene) indicated that coal combustion had great contribution to VOCs during winter, while contribution of paint and solvent evaporation increased in spring and summer. Alkenes played a predominant role in VOCs chemical reactivity, followed by aromatics and OVOCs. And the key reactive VOCs species in Beijing were ethene, acetaldehyde, m/p-xylene, toluene, propene, o-xylene, ethylbenzene, n-butane, 1-butene, and propanal.
王琴, 刘保献, 张大伟, 李云婷, 郇宁, 闫贺, 张博韬. 北京市大气VOCs的时空分布特征及化学反应活性[J]. 中国环境科学, 2017, 37(10): 3636-3646.
WANG Qin, LIU Bao-xian, ZHANG Da-wei, LI Yun-ting, HUAN Ning, YAN He, ZHANG Bo-tao. Temporal and spatial distribution of VOCs and their role in chemical reactivity in Beijing. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(10): 3636-3646.
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