| From November 2017 to January 2018,10 sources of particulate matter,including soil dust,road dust,mine dusts,urban dust,building cement dust,coal dust,process dust,motor vehicle exhaust dust,biomass combustion dust,catering oil fume,and four PM2.5 receptors,including Fuxin City Automobile Comprehensive Performance Monitoring Station,Environmental Monitoring Station,Combustion Monitoring Station Coal Quality Laboratory,Combustion Monitoring Station are sampled,analysis particle size characteristics of source particles,characterization of PM2.5 component spectrum of atmospheric sources and receptors,using enrichment factor method?EF?,principal component analysis?PCA?and chemical mass balance model?CMB?,the sources of winter atmospheric PM2.5 in Fuxin city are analyzed in this study.The results of particle size analysis shows that with the decrease of road types of large,medium and small roads?DX,ZX,XX?,the content of fine particulate matter in fugitive dust decreases,the average particle size?Mz?of CS,SN,JS,DY and DX are all less than 10 microns,skewness?Sk?is between 0.3 and 1,which belongs to very positive skewness;the standard deviation?S?of CS,SN and JS is greater than 4,and the sorting performance is very poor;peak state?KG?of CS,SN,JS and DY belongs to the type of medium and narrow peaks,the results show that the source particulate matter has obvious mixability of multiple sources.The results of PM2.5 source and acceptor spectrum analysis shows that TC?>40%?and OC?>30%?contents in moving sources,biomass combustion,cooking oil fume are relatively high,Si contents?>17%?in soil dust,urban dust,road dust are relatively high,and SO42-?16.82%?content in coal dust is relatively high.The content of Si is the highest in the acceptor element component,and its concentration monitoring value reaches 3.23?g·m-3;SO42-is the highest in the acceptor ion component,and its monitoring concentration reaches 3.68?g·m-3;OC is the highest in the acceptor carbon component,and its concentration reaches 0.23?g·m-3.The analysis of sources of atmospheric PM2.5 in Fuxin city shows that the enrichment factors of Cd,Hg,Si,Zn,Pb are all more than 40.Among them,the enrichment factor of element Cd?532.34?is the highest,it is mainly from mobile sources,Hg and Si mainly come from process dust and dust source of soil.Three main components are extracted in PCA,and the cumulative contribution rate is 95.076%,they mainly come from the comprehensive sources of soot and mobile sources,soil dust sources and construction dust sources.Analysis of CMB shows that the highest secondary particulate share rate is 41.36%,and the soot is 13.40%,follows by the mobile source,which is 12.58%,it shows that the secondary sources of PM2.5 in winter in Fuxin can not be neglected.At the same time,the pollution control of soot from coal-burning sources andexhaust gas from motor vehicles should be strengthened. |
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