采暖季城市道路扬尘PM2.5成分谱及来源研究

Analysis on Composition Spectrum and Source of Road Dust PM2.5 during Heating Season

利用快速检测法收集石家庄市采暖季道路扬尘PM2.5样品,分析其元素、离子和碳组分,构建成分谱。结果表明化学组分中以OC、Si、Al、Fe、SO4^2-、Mg、EC、Ca、NO-3、NH+4、Ca2+、Cl-、NO-2、K为主。Cu为极强富集,Mo、Cd、Bi为显著富集,Sb、Sn、Zn、Pb、Cr、Ni、V、W为中度富集,Mg、Tl、Fe为轻微富集。快速路、主干道、次干道、支路的NO-3/SO4^2-平均值分别为0.75、0.48、0.61、0.61,表示快速路道路扬尘受移动源影响最大。OC、EC相关性分析、比值分析、SOC估值分析均表明道路扬尘PM2.5中OC、EC来源相似。

Road dust PM2.5 samples of Shijiazhuang city during heating season were collected by using TRAKER system.The elements,ions and carbon components were of samples analyzed.The composition spectrum was constructed.The results showed that OC,Si,Al,Fe,SO4^2-,Mg,EC,Ca,NO-3,NH+4,Ca2+,Cl-,NO-2 and K were the main components in road dust PM2.5.Cu was extreme enrichment,and Mo,Cd and Bi were significant enrichment.Sb,Sn,Zn,Pb,Cr,Ni,V and W were moderate enrichment,while Mg,Tl and Fe were slight enrichment.The average values of NO-3/SO4^2- of expressway,main trunk road,secondary trunk road and branch road were 0.75,0.48,0.61 and 0.61 respectively,which indicated that road dust of the expressways were most affected by moving source.OC,EC correlation analysis,OC/EC ratio analysis and SOC valuation analysis indicated that OC and EC sources were similar and SOC existed in road dust PM2.5.