%0 Journal Article
%T Physical and Chemical Characteristics of Individual Mineral Particles in an Urban Fog Episode<br>城市雾天单个矿物颗粒物理和化学特征
%A LI Wei-jun
%A SHAO Long-yi
%A SHI Zong-bo
%A LI Jin-juan
%A YANG Shu-shen
%A <br>李卫军
%A 邵龙义
%A 时宗波
%A 李金娟
%A 杨书申
%J 环境科学
%D 2008
%I 
%X Field emission scanning electron microscopy (FESEM) and scanning electron microscopy with energy dispersive X-ray detector (SEM-EDX) were used to study the four aerosol samples collected in Beijing air during the fog and non-fog episodes in winter. Size-distribution of mineral particles in fog sample displayed two major peaks at the size range of 0.1-0.3 microm and 1-2.5 microm. EDX analyses indicated that the major chemical compositions varied greatly in the individual mineral particles of the fog and non-fog episodes, especially the sulfur. A total of 9 different mineral categories were classified, namely, "Si-rich", "Ca-rich", "S-rich", "Fe-rich", "Mg-rich", "Al-rich", "Ti-rich", "K-rich" and "Cl-rich". About 55% of the "Ca-rich" in the fog samples comprised of Ca (50% +/- 1.2%)and S (37% +/- 1.6%) and about 72% of the "S-rich" comprised of S (44% +/- 1.5%) and Ca (33% +/- 2%), illustrating that particles with abundant sulfur were also enriched with abundant calcium. It is suggested that the "Ca-rich" alkali minerals could alleviate acidity of the fog water in Beijing air. The S/Ca mean ratio of mineral particles in the fog sample was 6.11, being 8 times higher than the S/Ca mean ratio of the non-fog samples (0.73). This result showed that sulfuration on the surfaces of aerosol particles was extremely severe, and that the conversion efficiency from SO2 to sulfates was relatively high.
%K aerosol
%K scanning electron microscopy with energy dispersive X-ray (SEM-EDX)
%K individual particle analysis
%K fog episode
%K inhalable particles (PM10)<br>气溶胶
%K 带能谱的扫描电镜(SEM/EDX)
%K 单颗粒分析
%K 雾天
%K 可吸入颗粒物(PM10)
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=0E0D8D73A945F9C1A68CDC3B0E415141&yid=67289AFF6305E306&vid=771469D9D58C34FF&iid=CA4FD0336C81A37A&sid=82722E2B785EBF0D&eid=B799C1769FCACDC8&journal_id=0250-3301&journal_name=环境科学&referenced_num=0&reference_num=25