【摘要】 研究了石家庄市秋季可吸入颗粒物质量浓度垂直分布和粒度分布特征.结果表明,环境空气中可吸入颗粒物的众径为0.2~1.0μm,比表面积为3536.2~4396.06m2/kg,PM2.5/PM10高达71.28%~81.14%;细小颗粒物累积百分含量随高度增加而增加,PM2.5和PM10累积分布随高度增加呈现出对数增加的规律;采样高度1.5m时,中位径D50>1μm,高度大于1.5m时,D50<1μm.不同高度降尘的比表面积为336.55~790.06m2/kg,PM2.5/PM10为19.46%~22.47%,D50为9.66~13.78μm,D98在34.93~53.48μm之间.更多还原

【Abstract】 This paper studies the vertical distribution of the mass concentration and particle size distribution of the respirable particles in autumn of Shijiazhuang.The results show that the diameter with the largest content is 0.2～1.0μm and the BET area of respirable particles in the atmosphere is 3536.2～4396.06m²/kg.The PM_2.5 to PM₁₀ ratio ranged from 71.28% to 81.14%.The accumulative content of the very small respirable particles is increasing with the sampling height.Moreover,PM_2.5 and PM₁₀ is logarithmic increasing with the sampling height.The D₅₀ is >1μm when the sampling height ≤1.5m and D₅₀ is <1μm when the sampling height >1.5m.For the dry depositions at different sampling heights,exhibit that D₅₀ is 9.66～13.78μm and the BET area is 336.55～790.06m²/kg and PM_2.5/PM₁₀ is 19.46%～22.47% and D₉₈ is 34.93～53.48μm.更多还原