保山市大气细颗粒物排放特征与理化特征分析

Analysis of Emissions and Physicochemical Characteristics of Fine Particles in Baoshan

于2016年11月9日—14日,用单颗粒气溶胶在线源解析技术分析保山市体育馆监测点大气中PM 2.5的化学组成、粒径分布、来源及典型排放源质谱特征。结果表明:采集的颗粒可分为7类,主要以有机碳、元素碳和混合碳颗粒为主,占电离颗粒数的60%以上;不同类型颗粒粒径分布差异较为明显;机动车尾气为首要污染贡献源,且呈周期性变化,每日有两个上升时段,分别为凌晨1:00—10:00和12:00—20:00;其次为燃煤源,贡献率为10%~40%;工艺过程源与生物质燃烧源贡献率相一致,总体上夜间贡献率高于白天;扬尘源、二次无机源贡献率变化幅度不大。

The chemical composition,size distribution,source apportionment and typical mass spectra character of PM 2.5 in the air from Baoshan stadium monitoring site during November 9th to 14th,2016 were analyzed by using single particle aerosol on-line source apportionment technology.The results showed that the collected particulates could be divided into 7 groups.Organic carbon,elemental carbon and mixed carbon particles were the main components,which made up to more than 60%of the ionized particles.Size distribution of various particles were obviously different,indicating that vehicle emission was the primary source and it had a periodic change,there were two rise periods each day,from 1:00 to 10:00 and from 12:00 to 20:00.The second source was from coal combustion with the contribution rate of 10%to 40%.The contribution of technological process and biomass burning were the same,it was higher at night than in the daytime.The contribution of dust source and secondary inorganic source changed little.