不同高度大气颗粒物中多环芳烃的粒径分布  

VERTICAL AND SIZE DISTRIBUTION OF POLYCYCLIC AROMATIC HYDROCARBONS IN TIANJIN URBAN AEROSOL

作　　者：吴水平[1] 蓝天[1] 左谦[1] 陶澍[1] 边海[2] 吴丹朱[2] 穆怀斌[2] 

机构地区：[1]北京大学环境学院地表过程分析与模拟教育部重点实验室,北京100871 [2]天津市气象科学研究所,天津300074

出　　处：《环境化学》2005年第1期76-80,共5页Environmental Chemistry

基　　金：国家重点基础研究专项基金 ( 2 0 0 3CB415 0 0 4);国家自然科学基金 ( 4 0 3 3 2 0 15;40 3 7110 5 )资助项目

摘　　要：在天津地区 2 0m ,4 0m和 6 0m三个不同高度同步采集冬季大气颗粒物中PM10 样品 ,测定了 16种多环芳烃 (PAHs )含量 不同高度PM10 中PAHs的含量均表现出大气颗粒物中随高度先增后降的趋势 ,颗粒物质量中值直径 (MMD )也呈现类似规律 ,但PAHs总浓度的MMD则呈向上递增的趋势 不同高度PAHs的粒径分布差别不大 ,高分子量的PAHs主要集中在空气动力学直径Dp<2 μm的细颗粒上 ,而Dp>2Vertical and size distributions of 16 polycyclic aromatic hydrocarbons (PAHs) have been measured twice in ambient aerosols collected at heights of 20m, 40m, and 60m in Tianjin urban area. Vertical distributions of PM 10 and 16 PAHs show a peak at 40m. The same trend was observed for the mass medium diameter (MMD) of PM 10. The MMD of ΣPAH(sum of 16 PAHs), however, monotonically increase with height. Size distributions of PAHs in the aerosols were almost the same at various heights. PAHs with high molecular weight were mainly distributed in the fine particles (aerodynamic diameter <2μm). The fractions of low molecular weight PAHs were mainly associated with coarse particles (aerodynamic diameter >2μm).

关 键 词：大气颗粒物 PM10 多环芳烃(PAHs) 粒径分布 细颗粒 颗粒物质 样品 MMD 含量 低分子量 

分 类 号：X831[环境科学与工程—环境工程]