Temporal and spatial distribution of VOCs and their role in chemical reactivity in Beijing
(2.Beijing Key Laboratory of Airborne Particulate Matter Monitoring Technology, Beijing, China 100048)
(3.Beijing Municipal Environmental Protection Bureau, Beijing, China 100048)
【Abstract】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, in order to better understand the characteristics of VOCs species 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 successively. The VOCs concentrations at DS and YLD sites were much higher than those at DL site. DS site was heavily influenced by vehicular exhausts and the usage of LPG/NG, YLD site had great contributions of vehicular emissions, paint and solvent evaporation, while DL site had more influence of urban pollution transportation. The VOCs concentrations were high in winter and low in summer. Because of the different emission sources, VOCs species at the three sites exhibited different diurnal variations. The ratios of toluene/benzene indicated that coal combustion had a great contribution to VOCs in 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 ethylene, acetaldehyde, m/p-xylene, methylbenzene, propene, o-xylene, ethylbenzene, n-butane, 1-butene, and propanal.
【Keywords】 Beijing; VOCs; temporal and spatial distribution; chemical reactivity;
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