【摘要】 使用Andersen六段分级大流量采样器(粒径:7.2~10,3.0~7.2,1.5~3.0,0.95~1.5,0.49~0.95,<0.49μm)采集了广州市荔湾区冬季的大气颗粒物样品,并用美国Sunset碳分析仪分析了其中的有机碳(OC)和元素碳(EC)组分.研究表明:OC和EC主要存在于细粒子中,与OC相比,EC则相对更集中于<0.49μm粒径上;PM10中二次有机碳占总有机碳(ρ(OCsec)/ρ(OCtot))比例的平均值为47%,OC,EC的对数模型图都为双峰型.对ρ(OCtot),ρ(OCpri)(一次有机碳质量浓度)与ρ(EC)进行相关性分析,结果表明,只用ρ(OC)/ρ(EC)值来评价二次污染是不充分的.更多还原

【Abstract】 In the winter time aerosol samples have been collected by Andersen HiVol pumping system equipped with a six-stage cascade impactor（size range: 7.2～10,3.0～7.2,1.5～3.0,0.95～1.5,0.49～0.95,<0.49 μm） in Liwan District,Guangzhou.Organic carbon（OC） and elemental carbon（EC） in particles were determined by Sunset carbon analyzer of USA.OC and EC were associated with the fine particle.Compared with OC,EC was preferably enriched in <0.49 μm particle.The average percentage of estimated secondary OC(OC_sec) in the total OC (OC_tot) in PM₁₀ was 47%,and the log-normal size distribution of OC and EC was bi-modal.The correlation between ρ(OC_tot),ρ(OC_pri)（directly emitted OC） and ρ（EC） indicated that the ratios of ρ（OC）/ρ（EC） could not be used as a plausible index for the evidence of secondary pollution.更多还原