【摘要】 以北京 2个采样点连续采集的样品对PM2 5中的元素、水溶性离子和含碳组分进行分析 .车公庄和清华园PM2 5中有机物的含量分别为 2 7 8%和 30 9% ,是含量最丰富的物种 ,其次是二次无机粒子、土壤尘、元素碳和微量元素 .PM2 5中约有 2 4 %的质量未能鉴别成分 ,相关性分析表明 ,含碳物种的估算所引起的偏差可能是主要的原因 .采暖期重污染周和春季沙尘周PM2 5的化学物种构成悬殊 ,反映了季节性变化的源排放和特殊气象条件的综合作用 .更多还原

【Abstract】 Weekly PM 2.5 samples were continuously collected at two locations in Beijing,and elements,water soluble ions,and carbonaceous species were measured.Organic material was the most abundant species in PM 2.5 ,with a mass percentage of 27.8% and 30.9% at Chegongzhuang and Qinghuayuan,respectively.It was followed in decreasing order by secondary inorganic particles,soil dust,elemental carbon,and trace elements.About 24% of PM 2.5 mass was not identified in the two sampling sites,most likely due to the error from estimation of carbonaceous speciation.PM 2.5 chemical speciation was very different between the week with heavy pollution in heating season and that with severe dust storm in spring,which resulted from the combination effects of source emission varied with seasons and special meteorological conditions.更多还原