摘要
本研究分别于2017年10月1—31日、2018年1月1—31日、4月1-30日和7月1—31日对邯郸市主要大气污染物VOCs、O3和NOx进行在线监测,并在此基础上进行了VOCs组成、臭氧(O3)和氮氧化物(NOx)的污染特征研究,利用最大增量反应活性(MIR)和羟基反应速率(LOH)法综合分析各类VOCs的臭氧生成潜势(OFP),并利用主成分分析(PCA)模型对邯郸市大气VOCs进行定性和定量的源解析.结果表明,监测期间邯郸市VOCs平均浓度为128.7μg·m^(-3),与国内其他发达城市相比略低.VOCs浓度冬季最高,平均浓度为151.6μg·m^(-3).各种成分中烷烃占比最高(49.5%),其次是烯烃(26.1%),最低的是芳香烃(24.4%).其中浓度高的烷烃物种主要包括乙烷、丙烷、异戊烷、苯和甲苯.每日之内O3浓度呈单峰结构,在10:00—16:00期间达到高值,NOx与之趋势相反.利用MIR法计算得烯烃和芳香烃对O3生成贡献较高,分别为43.7%和34.4%;而烷烃对O3生成的贡献率相对最低,为21.9%.MIR法与LOH法计算结果相近,对O3生成的贡献率相对较高的物种主要有乙烯、2-甲基戊烷、异戊二烯、1,3,5-三甲基苯、1,2,4-三甲基苯和1,2,3-三甲基苯.溶剂使用、燃料蒸发和汽车尾气排放以及工业污染源是邯郸市VOCs的主要来源.
In this study,volatile organic compounds(VOCs),nitrogen oxide(NOx)and ozone(O3)were monitored online in Handan during October 1—31,2017,January 1—31,2018,April 1—30,2018,and July 1—31,2018,respectively.Based on those data,the characteristics of VOCs compositions,O3 and NOx pollution were studied.Ozone formation potential(OFP)was analyzed using the Maximum Incremental Reactivity(MIR)and level of·OH radicals(LOH).Our results showed that the average concentration of VOCs in Handan was 128.7μg·m^(-3),slightly lower than other developed cities in China.VOCs concentration was the highest in winter,with an average of 151.6μg·m^(-3).Alkanes(49.5%)were the largest contributors,followed by alkenes(26.1%),and aromatic hydrocarbons(24.4%).Ethane,propane,isopentane,benzene,and toluene were the top five species of the VOCs.It was found that the O3 concentrations in summer were much higher than those in other three seasons.Within a day,O3 concentrations had a single peak during the time of 10:00—16:00.The results of OFP calculated by MIR showed that alkenes contributed 43.7%to O3 generation,followed by aromatic hydrocarbons(34.4%),and alkanes(21.9%).The results by MIR and LOH were similar that ethylene,2-methylpentane,isoprene,1,3,5-trimethylbenzene,1,2,4-trimethylbenzene,and 1,2,3-trimethylbenzene were the major contributors to O3 generation.It indicates that solvent use,fuel evaporation and vehicular emissions,and industrial sources are major sources.The variance contribution rates are 38.7%,16.0%,and 15.1%,respectively.
作者
刘营营
王丽涛
齐孟姚
王雨
鲁晓晗
谭静瑶
刘振通
汪庆
许瑞广
张海霞
LIU Yingying;WANG Litao;QI Mengyao;WANG Yu;LU Xiaohan;TAN Jingyao;LIU Zhentong;WANG Qing;XU Ruiguang;ZHANG Haixia(College of Energy and Environmental Engineering,Hebei University of Engineering,Handan,056038,China;Hebei Key Laboratory of Air Pollution Cause and Impact(Preparatory),Handan,056038,China;Institute of Earth Environment,Chinese Academy of Sciences,Xi'an,710061,China)
出处
《环境化学》
CAS
CSCD
北大核心
2020年第11期3101-3110,共10页
Environmental Chemistry
基金
国家自然科学基金(41475131,41703088)
大气重污染成因与治理攻关项目(DQGG-05-09,DQGG-01-07,DQGG-02-09,DQGG-03-04)
河北省杰出青年科学基金(D2017402086)
河北省重点研发计划项目(17273712D,19273707D)
河北省青年拔尖人才支持计划
河北省高校百名优秀创新人才支持计划(SLRC2017025)
河北省人才工程培养经费(A2016002022)联合资助
