摘要
为探讨珠三角地区PM2.5中有机物(OM)来源结构,该研究利用2017年9月-2018年8月在典型轻工业区采集的PM2.5样品的化学组分及水溶性有机质谱数据,进行了受体模型源解析研究。将17种化学组分、羧基离子碎片(CO2+)和水溶性有机氧(WSOO)输入正矩阵因子(PMF)模型进行OM源解析,结果如下:观测期间大气PM2.5平均质量浓度为32μg/m3,OM占比39%。SOA、机动车、生物质燃烧为OM的主要来源,对OM质量浓度的贡献依次为38%、23%和19%,工业、船舶、燃煤、地面扬尘和建筑尘的贡献均在8%以内。污染源变化特征分析表明,SOA和生物质燃烧对OM的贡献浓度呈现"冬高夏低"的季节变化,机动车全年波动相对较小。高污染天气下SOA和生物质燃烧产生的OM比例增加显著,可重点防控VOCs排放和露天焚烧活动以降低该区域OM的污染水平。
In order to explore the source structure of organic matter(OM)in the Pearl River Delta,a study on source apportionment by the receptor model was conducted based on the chemical composition and water-soluble organic data of mass spectrometry of the PM2.5 samples collected in a typical light-industrial zone during the period from September 2017 to August 2018;and 17 chemical components,carboxyl ion fragment(CO2+)and water-soluble organic oxygen(WSOO)were input to the positive matrix factorization(PMF)model.Results of the study showed that the annual mean concentration of PM2.5 was 32μg/m3,and OM accounted for 39%;secondary organic aerosol(SOA),vehicle emissions and biomass burning were the main pollution sources of OM,accounting for 38%,23%,19%of the mass concentration of OM,respectively,while the contributions of industry emissions,ship emissions,coal burning,fugitive dust and building dust were within 8%.Besides,the pollution sources characteristics changed with season:SOA and biomass burning were higher in winter and lower in summer in terms of their portions in OM concentration,and vehicle emissions concentration fluctuated less the whole year.The contributions of biomass burning and SOA increased to OM concentration significantly during severe pollution days,so VOCs emission and open burning ought to be controlled particularly to reduce OM pollution in the zone.
作者
于广河
苏翠平
曹礼明
王川
黄晓锋
YU Guanghe;SU Cuiping;CAO Liming;WANG Chuan;HUANG Xiaofeng(Environmental Laboratory,PKU-HKUST Shenzhen-Hong Kong Institution,Shenzhen 518057,China;Key Laboratory of Urban Human Residential Environmental Science and Technology,Shenzhen Graduate School,Peking University,Shenzhen 518055,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2020年第9期155-162,共8页
Environmental Science & Technology
基金
国家自然科学基金资助项目(91744202)
深圳市科技计划资助项目(JCYJ20180712093002076)
关键词
PM2.5
有机物
二次有机气溶胶
源解析
珠三角
PM2.5
organic matter
secondary organic aerosol
source apportionment
the Pearl River Delta
