%0 Journal Article
%T Microscopic Characteristics and Size Distribution of Summer PM10 in the Air of a Northwestern Urban Site and a Clean Air Site in Beijing<br>北京西北城区与清洁对照点夏季大气PM10的微观特征及粒度分布
%A Shao Longyi
%A Shi Zongbo
%A <br>邵龙义
%A 时宗波
%J 环境科学
%D 2003
%I 
%X Microscopic characteristics and size distribution of individual particles in the summer (2001) PM10 collected at a northwestern urban site and a clean air site in Beijing have been investigated using high resolution Field Emission Scanning Electron Microscopy (FESEM) and image analysis technologies. The soot aggregates were observed at both sampling sites, showing a characteristic regional pollution. The irregular mineral particles existed commonly at the urban site but were rarely seen at the clean air site. The elongated gypsums and biological particles were observed only at the clean air site. PM10 displayed a biomodal number-size distribution, with a higher peak in 0.2-0.5 micron range and a lower peak in 1-2.5 microns range. In contrast, volume-size distribution of PM10 exhibited a unimodal pattern with the peak in 1-2.5 microns range. The coarse particles, mainly minerals, had a considerable contribution to the PM10 mass, although they were insignificant in number. In PM2.5, however, the soot aggregates were dominant both in number and mass.
%K PM10
%K image analysis
%K Scanning Electron Microscopy (SEM)
%K individual particle analysis
%K size distribution<br>可吸入颗粒物
%K 图像分析
%K 扫描电镜(SEM)
%K 单颗粒分析
%K 粒度分布
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=947DDFF1E4D3B050&yid=D43C4A19B2EE3C0A&vid=B91E8C6D6FE990DB&iid=94C357A881DFC066&sid=708DD6B15D2464E8&eid=7801E6FC5AE9020C&journal_id=0250-3301&journal_name=环境科学&referenced_num=17&reference_num=18