| 北京大气PM2.5中铅的同位素测定和来源研究 |
| 摘要点击 1842 全文点击 1519 投稿时间：2005-04-30 修订日期：2005-07-06 |
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| 中文关键词 铅 大气颗粒物 同位素丰度比 |
| 英文关键词 lead atmospheric aerosols isotope abundance ratio |
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| 中文摘要 |
| 用石英滤膜连续采集北京2003-02～2003-03的12个PM2.5样品,进行无机多元素、OC、EC和铅同位素丰度比的分析测定.对样品进行聚类分析,结合气象信息讨论了分组结果,描述了2003年春北京市的2个大气铅污染过程.2个污染过程均表现出铅含量高,206Pb/207Pb丰度比低的特点.Al、Ca、K等地壳元素的含量与Pb的含量负相关,表明土壤尘对铅的贡献不大.比较Pb、As、Zn、Se和Al、Ca等地壳元素含量的相关性,2个铅污染过程是由有色冶金排放和燃煤排放共同主导的.而02-28～03-02的铅污染过程中,燃煤排放贡献增大,有色冶金排放贡献下降.结果表明,汽油无铅化以后,北京市春季大气颗粒物中的铅主要来源于有色冶金排放与燃煤排放. |
| 英文摘要 |
| Fine atmospheric aerosol(PM2.5) samples were collected on quartz filter in spring 2003 in Beijing,and multiple elements,organic carbon,elemental carbon,and lead isotopes were subsequently measured.Sample groups classified using cluster analysis method were discussed in conjunction with meteorological information.Two episodes of lead pollution were identified and described.Both episodes were featured by high lead content and low 206Pb/207Pb ratio.Concentration of elements such as Al,Ca,K varied differently from that of lead,implying soil dust a minor source of lead in air.Based on the variation correlation among Pb,As,Zn,Se,Al,Ca,it was induced that both episodes were dominated by non-ferrous industrial emission and coal combustion,the episode from February 28 to March 2,2003 had more coal combustion and less non-ferrous industry contributions.After phase-out of leaded petrol,non-ferrous industry and coal combustion appeared as the major source of aerosol lead pollution in Beijing. |
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