典型污染源PM2.5源谱特征及区域排放贡献研究

AbstractTaking a city in southwest China as the research area,seven categories of sources,including fixed combustion sources of fossil fuels,technological process sources,mobilesources,biomass combustion sources,dust sources,agricultural sources and other emissionsources,were investigated to obtain PM2s emissions from emission sources of variousindustries and establish the composition spectrum of PM2s particles in typical industries.Process source is the main source of PM2s in the city's atmospheric environment.Among them,the quality fraction of S in the sintering process of iron and steel industry isthe highest,which is 50.3%.Fe is the main element in the primary smelting process.Theproportion of water-soluble ions was 5.0%~12.6%,in which Na',SO42,NO2 and NH4"accounted for a higher proportion.The total proportion of OC+EC ranged from 15.4%to61.0%.In the catering industry,Ca,Al and Mg accounted for the highest proportion ofelement components.The water-soluble ionic component NH4 is higher.Ca is the maincomponent in the glass industry.The proportion of SO42emission was significantly higherat 15.55%.Na and Fe accounted for the highest proportion in the components of movingsource elements.The proportion of NO2and Na'is relatively high.Among the dust sources,the main components of inorganic metal elements in the site dust particles are Ca,Fe,Al,Mg and K in order of proportion.The mass fraction of Ca2+was the highest among thewater-soluble ionic components.The proportion of OC in PM2s was 3.977%.Si accountedfor the highest proportion in the waste incineration source spectrum(3.6%).The contents ofNH4 and Clin water-soluble ions were the highest.In terms of OC and EC concentration,OC concentration is 45.7 g/m3,EC concentration is 14.7 g/m3,OC/EC concentration is 4.7,OC accounts for the vast majority of PM2s,up to 64.28%.Key words:PM23;component;source spectrum