摘要
为深入了解挥发性有机物(VOCs)的大气化学作用,基于贵阳市2022年5月VOCs离线观测数据,系统性分析VOCs的浓度水平、化学组成、OH活性、NO_(3)活性、O_(3)活性、臭氧生成潜势(OFP)和二次有机气溶胶生成潜势(SOAP)。结果表明,观测期间,VOCs的浓度、OH活性、NO_(3)活性、O_(3)活性、OFP和SOAP平均值分别为71.86±12.86μg/m^(3)、3.52±1.28 s^(-1)、1.65×10^(-3)±1.57×10^(-3) s^(-1)、3.87×10^(-7)±4.31×10^(-7) s^(-1)、36.08±35.44μg/m^(3)和369.41±231.42μg/m^(3),均呈现晚上高白天低的日变化。烷烃是VOCs浓度的主要贡献组分,占比为38.66%,需重点关注丙酮、二氯甲烷、正丁醛、一溴二氯甲烷和氯仿等高浓度物种;OVOCs是OH活性贡献最大的组分,占比为46.50%,烯烃是NO_(3)活性和O_(3)活性主要贡献种类,贡献占比分别为68.07%和97.85%,需重点关注乙烯、丙烯、正丁醛、异戊二烯、丁烯、反-2-丁烯和顺-2-丁烯等活性物种;OVOCs和芳香烃分别是OFP和SOAP主要贡献种类,占比分别为48.18%和78.92%,需重点关注正丁醛、乙烯、乙醛和丁烯等主要的OFP贡献组分,和芳香烃类物种、苯甲醛和正十二烷等主要的SOAP贡献组分。后向轨迹研究发现,为进一步削减贵阳市O_(3)和颗粒物污染,VOCs控制政策应该重点关注贵阳市东部和北部地区。
In order to have a deeper understanding of the roles in atmospheric chemistry of ambient volatile organic compounds(VOCs),the VOCs concentration level,chemical composition,OH reactivity,NO_(3) reactivity,O_(3) reactivity,ozone formation potential(OFP)and secondary organic aerosol formation potential(SOAP)were comprehensively characterized based on the offline observation data of VOCs in Guiyang in May 2022.The results showed that VOCs concentration,OH reactivity,NO_(3) reactivity,O_(3) reactivity,OFP and SOAP averaged 71.86±12.86μg/m^(3),3.52±1.28 s^(-1),1.65×10^(-3)±1.57×10^(-3) s^(-1),3.87×10^(-7)±4.31×10^(-7) s^(-1),36.08±35.44μg/m^(3) and 369.41±231.42μg/m^(3),respectively,exhibiting high values during the nighttime and low values during the daytime.Alkanes were the main contributors of VOCs concentration,accounting for 38.66%of VOCs,among which high-concentration species such as acetone,dichloromethane,butyraldehyde,bromodichloromethane and trichloromethane should be focused on.OVOCs were the largest component of OH reactivity,accounting for 46.50%,alkenes were the main contributors of NO_(3) reactivity and O_(3) reactivity,accounting for 68.07%and 97.85%,respectively,and highly active species such as ethylene,propylene,n-Butyraldehyde,isoprene,butylene,cis-2-Butene and trans-2-Butene should attract more attention.OVOCs and aromatics were the main contributing species of OFP and SOAP,respectively,accounting for 48.18%and 78.92%,with major OFP contribution components such as n-Butanal,ethylene,acetaldehyde and butene,and major SOAP contribution components such as aromatics species,benzaldehyde and n-Dodecane.Backward trajectory studies found that,to further reduce O_(3) and particulate pollution in Guiyang,VOCs control policies should focus on the eastern and northern regions of Guiyang.
作者
符露
杨员
王永红
余帆
徐鹏
刘豪
冯培松
FU Lu;YANG Yuan;WANG Yonghong;YU Fan;XU Peng;LIU Hao;FENG Peisong(Guizhou Industry Polytechnic College,Guiyang 550003;Guizhou Research and Designing Institute of Environmental Sciences:Guizhou Academy of Environmental Science and Design,Guiyang 550081;Guizhou Ruien Testing Technology Co.,LTD,Guiyang 550014;College of Resources and Environmental Engineering,Guizhou University,Guizhou Karst Environmental Ecosystems Observation and Research Station,Ministry of Education,Guiyang 550025)
出处
《地球与环境》
CAS
CSCD
北大核心
2022年第6期863-875,共13页
Earth and Environment
基金
贵州省科技计划项目(黔科合支撑[2021]一般498、黔科合基础[2020]1Y175、黔科合支撑[2022]一般209)。
