| 采暖期开始前后北京大气颗粒物中化学元素特征及来源 |
| 摘要点击 3342 全文点击 1559 投稿时间：2007-11-07 修订日期：2007-12-29 |
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| 中文关键词 颗粒物 粒径分布 采暖期 |
| 英文关键词 particles size distribution heating period |
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| 中文摘要 |
| 为比较研究采暖期与非采暖期大气颗粒物的特征，2006年11月，在北京城区采用Andersen分级撞击式采样器进行了大气气溶胶分级采样，并利用ICP-MS对其中22种化学元素浓度进行了分析.结果表明，采暖期As、Se、Mo、Cd浓度较采暖前上升2倍以上，Zn、Pb、Tl、K、Se、As、Cu、Cd、Ag在细粒径段的分布出现大幅度的增长，Zn、Na出现向细粒径段移动的趋势.因子分析表明，在采暖期燃烧源的贡献增强，地壳源的贡献减弱. |
| 英文摘要 |
| In order to study the characteristics and sources of atmospheric particles before and in heating period，samples of atmospheric particles were collected in November of 2006.Concentrations of elements in particles were determined with ICP-MS.The results shows that concentrations of As，Se，Mo，Cd in heating period are more than twice of those before heating period，and there is sharp increasing of concentrations of Zn，Pb，Tl，K，Se，As，Cu，Cd，Ag in fine particles in heating period.Furthermore，Zn，Na are associated with finer particles in heating period than those before heating period.Factor analysis on the chemical composition of particles shows that contribution of combustion and biomass burning goes up and contribution of crust goes down in heating period. |
