Characteristics of VOCs and formation potential of O3 and SOA in autumn and winter in Baoji, China
ZHANG Rui-xu1,2, LIU Huan-wu3, DENG Shun-xi1, RUI Shou-juan1, WANG Wei-jun1
1. School of Water and Environment, Chang' an University, Xi'an 710064, China;
2. Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region, Chang' an University, Xi'an 710064, China;
3. Xi'an Environmental Monitoring Station, Xi'an 710054, China
A total of 102 ambient volatile organic compounds (VOCs) were detected during the 29-day online real-time scrutiny conducted in the urban area of Baoji during October and December, 2017. The ozone formation potential (OFPs) and the secondary organic aerosol formation potential (SOAFPs) of VOCs species were estimated using the maximum incremental reactivity (MIR) coefficient and the fractional aerosol coefficient (FAC), respectively, so as to screen out the VOCs species that had the largest contribution to the formation of O3 and SOA. The results showed that the concentration of TVOC in Baoji in the autumn and winter were (68.62±21.85)×10-9 and (42.44±16.62)×10-9. The total OFPs were 185.49×10-9 and 126.00×10-9 in the autumn and winter, respectively; the total SOAFPs were 3.26, 0.65μg/m3 in the two seasons, respectively. In the autumn, alkanes (21.83×10-9) and aromatics (13.37×10-9) contributed the highest contents, which accounted for 31.82% and 19.49% of TVOC, respectively. In the autumn, ethylene, trans-2-pentene and toluene were the species having the largest contribution to OFPs, whereas toluene, m, p-xylene and ethylbenzene were the largest contributors to SOA production. In the winter, alkane (17.34×10-9) and alkyne (8.81×10-9) were the top two abundant species, which accounted for 40.85% and 20.75% of TVOC, respectively. In the winter, ethylene, propylene and acetylene were the three major components that had the largest contribution to OFPs; whereas toluene, m-p-xylene, and ethylbenzene were the top three VOCs that had the largest contribution to SOA production. To conclude, it is an efficient way to reduce O3 and SOA pollution in autumn and winter in Baoji through controlling concentrations of alkenes and aromatics in ambient air.
张瑞旭, 刘焕武, 邓顺熙, 芮守娟, 王伟军. 宝鸡市秋冬季大气VOCs浓度特征及其O3和SOA生成潜势[J]. 中国环境科学, 2020, 40(3): 983-996.
ZHANG Rui-xu, LIU Huan-wu, DENG Shun-xi, RUI Shou-juan, WANG Wei-jun. Characteristics of VOCs and formation potential of O3 and SOA in autumn and winter in Baoji, China. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(3): 983-996.
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