摘要
为深入了解聊城市秋冬季挥发性有机物(VOCs)的污染特征、来源及其对臭氧和二次有机气溶胶的生成潜势,作者使用在线监测系统分析了城区115种VOCs的体积分数。利用最大增量反应活性系数法和气溶胶生成系数法,计算了VOCs的臭氧生成潜势(OFPs)和二次有机气溶胶的生成潜势(SOAFPs),并利用特征性比值法和正交矩阵因子模型(PMF)解析了大气VOCs的来源。结果表明:秋、冬季VOCs的化学组成相似,烷烃和OVOCs是体积浓度最高的2种组分。冬季OFPs为140.2×10^(-9),约是秋季(89.0×10^(-9))的1.6倍,OVOCs和C2~C4烯烃对秋、冬季VOCs的OFPs贡献最大(占54.7%~58.6%)。秋季(1.0μg/m^(3))与冬季(1.2μg/m^(3))生成的SOAFPs质量浓度水平相似,间/对-二甲苯、甲苯和邻-二甲苯是秋、冬季SOAFPs贡献最大的3种组分。甲苯/苯比值的分析结果表明,机动车尾气是聊城市大气VOCs的重要来源之一。PMF分析结果显示,秋季VOCs主要来自植物源和二次生成源(27.2%)、机动车尾气排放源(19.5%)、燃料燃烧源(18.5%)、溶剂使用源(17.5%)与工业源(17.3%);而冬季VOCs主要来源于汽油车尾气排放源(24.4%)、有机化工排放源(21.3%)、工业卤代烃源(20.8%)、柴油车尾气排放源(16.9%)与溶剂使用源(16.6%)。以上结果可为聊城市大气VOCs排放管控与空气质量改善提供重要的数据支持。
To better understand the pollution characteristics and sources of volatile organic compounds(VOCs),and their po-tentials for the formation of O3 and secondary organic aerosol,the volume concentrations of 115 VOCs during the autumn and winter in the urban atmosphere of Liaocheng were monitored by online monitoring system.In this study,the ozone formation potential(OFPs)and SOA formation potential(SOAFPs)were determined using the maximum incremental reactivity coeffi-cient and the fractional aerosol coefficient,respectively.In addition,the sources of VOCs were analyzed using the characteris-tic ratios and positive matrix factorization(PMF).The results showed that the chemical compositions VOCs were similar in autumn and winter.Alkanes and OVOCs were the two most abundant species.The OFPs in winter was 140.2×10^(-9),which was about 1.6 times higher than that(89.0×10^(-9))in autumn.OVOCs and C2~C4 olefins contributed the most to the OFPs of VOCs(54.7%~58.6%)in autumn and winter.The concentration level of SOAFPs in autumn(1.0μg/m^(3))was similar to that(1.2μg/m^(3))in winter.M/p-xylene,toluene,and o-xylene contributed the most to SOAFPs in both autumn and winter.The ra-tio of toluene to benzene(T/B)indicated the motor vehicle exhaust was one of the important sources in Liaocheng.The results of PMF showed that the biogenic sources and secondary formation,vehicle exhaust emissions,fuel combustion sources,sol-vent usage sources,and industrial sources were the dominant sources of VOCs in autumn,which accounted for 27.2%,19.5%,18.5%,17.5%and 17.3%,respectively.Nevertheless,the gasoline vehicles exhausts,organic chemical industry emissions,in-dustrial halocarbon emissions,diesel vehicle exhausts,and solvent usage sources were the main sources of VOCs in winter,which accounted for 24.4%,21.3%,20.8%,16.9%and 16.6%,respectively.The results can provide important data for the con-trol of VOCs and improvement of air quality in Liaocheng City.
作者
黄同林
王艳辉
王一秋
王亚晨
马江凯
张晓婷
宋小涵
孟静静
侯战方
HUANG Tongin;WANG Yanhui;WANG Yiqiu;WANG Yachen;MA Jiangkai;ZHANG Xiaoting;SONG Xiaohan;MENG Jingjing;HOU Zhanfang(School of Geography and Environment,Liaocheng University,Liaocheng 252000,China;Centre for Liaocheng Environmental Information and Monitoring,Liaocheng 252000,China;State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710061,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2024年第1期189-200,共12页
Environmental Science & Technology
基金
国家自然科学基金项目(42177083)
山东省高等学校“青创科技计划”(2021KJ085)
山东省自然科学基金项目(ZR2020MD113)。
关键词
挥发性有机物
臭氧生成潜势
二次有机气溶胶生成潜势
来源解析
聊城市
volatile organic compounds
ozone formation potential
secondary organic aerosol formation potential
source apportionment
Liaocheng City
