铜川市秋冬季大气VOCs特征及其O_(3)和SOA形成潜势分析  

Characteristics of VOCs and Formation Potentials of O_(3)and SOA in Autumn and Winter in Tongchuan, China

作　　者：易宵霄 李姜豪 李光华 路珍珍[1] 孙智钢 高健 邓顺熙[1,2] YI Xiao-xiao;LI Jiang-hao;LI Guang-hua;LU Zhen-zhen;SUN Zhi-gang;GAO Jian;DENG Shun-xi(School of Water and Environment,Chang'an University,Xi'an 710064,China;Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region,Ministry of Education,Chang'an University,Xi'an 710064,China)

机构地区：[1]长安大学水利与环境学院,西安710064 [2]长安大学旱区地下水文与生态效应教育部重点实验室,西安710064

出　　处：《环境科学》2022年第1期140-149,共10页Environmental Science

基　　金：国家重点研发计划项目(2017YFC0212206);陕西省重点产业创新链(群)研发计划项目(2018ZDCXL-SF-02-01)。

摘　　要：VOCs是O_(3)和SOA形成的重要前体物,可增强大气氧化性,促进二次污染物形成,影响区域空气质量和人体健康.为研究铜川市秋冬季VOCs特征及其对O_(3)和SOA生成的潜力,利用TH-300B在线监测系统监测了铜川市区102种VOCs的体积分数,并结合最大增量反应活性系数法和气溶胶生成系数法分别计算VOCs的O_(3)及SOA生成潜力.结果表明,铜川市秋季和冬季φ(TVOC)分别为(50.52±16.81)×10^(-9)和(63.21±35.24)×10^(-9),O_(3)生成潜势分别为138.43×10^(-9)和137.123×10^(-9), SOA生成潜势分别为3.098μg·m^(-3)和0.612μg·m^(-3).秋季VOCs中含量最多的2种组分为烷烃(26.19%)和芳香烃(26.04%),冬季VOCs中含量最多的组分为烷烃(48.88%).反-2-戊烯、甲苯和间/对-二甲苯是秋季OFPs最大的3个成分,乙烯、乙炔和丙烯是冬季OFPs最大的3个成分.甲苯、间/对-二甲苯和乙苯是秋冬季SOAFPs最大的3个成分.交通排放是秋冬季VOCs的主要来源,生物质燃烧/燃煤排放具有季节性差异,是冬季VOCs的主要来源.该结果可为铜川市等"一市一策"管控污染物排放、改善环境空气质量提供技术依据.Volatile organic compounds(VOCs) are the main precursors of tropospheric O_(3)and secondary organic aerosol(SOA), which can enhance atmospheric oxidation, promote the formation of secondary pollutants, and affect regional air quality and human health. In order to gain insights on VOCs characteristics and their potentials for O_(3)and SOA formation, the volume fraction of 102 VOCs in autumn and winter in the urban area of Tongchuan were monitored using the TH-300 B online monitoring system. The maximum incremental reactivity(MIR) coefficient and the fractional aerosol coefficient(FAC) were used to estimate the ozone formation potential(OFP) and SOA formation potential(SOAFP), respectively. The φ(TVOC, total VOCs) were(50.52±16.81)×10^(-9)in autumn and(63.21±35.24)×10^(-9)in winter. The OFPs were 138.43×10^(-9)in autumn and 137.123×10^(-9)in winter, and the SOAFPs were 3.098 μg·m^(-3)and 0.612 μg·m^(-3), respectively. Alkanes(26.19%) and aromatics(26.04%) were the most abundant species in autumn, and alkanes(48.88%) were the most abundant species in winter. Trans-2-pentene, toluene, and m/p-xylene were the most reactive species in terms of OFPs in autumn, and ethylene, acetylene, and propylene were the top three species contributing to the total OFPs in winter. Toluene, m/p-xylene, and ethylbenzene contributed the most to the total SOAFPs in both of autumn and winter. Traffic emissions were considered as the major source of VOCs in both seasons. VOCs from biomass/coal combustion emissions showed seasonal differences, which were more prominent in winter. The results can provide references for the “one city, one policy” to mitigate regional VOCs pollution and improve ambient air quality.

关 键 词：挥发性有机物(VOCs) 臭氧(O_(3)) 臭氧生成潜势(OFP) 二次有机气溶胶(SOA) 铜川市 

分 类 号：X511[环境科学与工程—环境工程]