| 兰州市沙尘和非沙尘天气沉降物的化学特性比较 |
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| 引用本文： | 李玉霖,拓万全,崔建垣.兰州市沙尘和非沙尘天气沉降物的化学特性比较[J].中国沙漠,2006,26(4):648-651. |
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| 作者姓名： | 李玉霖 拓万全 崔建垣 |
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| 作者单位： | 中国科学院 寒区旱区环境与工程研究所， 甘肃 兰州 730000 |
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| 基金项目： | 甘肃省兰州市科技计划;国家自然科学基金;国家"火炬计划" |
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| 摘 要： | 选择兰州市典型沙尘和非沙尘天气收集两类降尘，并对其元素组成进行测定。结果表明：兰州非沙尘和沙尘天气沉降物中含量较高的主要元素分别为Si、Ca、Al、Fe和Si、K、Ca、Al，含量最低的主要元素均是Ti；含量较高的微量元素是Mn、Ba、Zn、Sr和Mn、Ba、Sr、Zr，含量较低的微量元素均是Nb、Co、Y、As；兰州非沙尘和沙尘天气沉降物中主要元素及微量元素含量的排序差异较小，但是两种样品同种元素的丰度值存在较大变异，说明两种沉降物的来源有一定的差异。兰州非沙尘天气沉降物中Si、Fe、Mg、K、Na、Ti、V、Mn、Co、Ni、Rb、Sr、Y、Zr、Nb等元素主要来自于地壳源，Ca、Cr、Cu、Ba、Pb、Zn、As等元素与本地的人类污染活动有关，其中Pb、Zn、As是兰州重要的污染元素。沙尘天气沉降物中多数元素来自于外地入侵的沙尘，部分元素如Pb、Zn、As、Cu、Cr、K、Ni可能源于沙尘天气长距离传输途中矿物气溶胶与沿途污染源排放的污染物的混合。
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| 关 键 词： | 元素 沙尘天气 非沙尘天气 沉降物 |
| 文章编号： | 1000-694X（2006）04-0648-04 |
| 收稿时间： | 2005-12-06 |
| 修稿时间： | 2006-03-20 |
Comparison of Chemical Composition between Dustfall under Dust and Non-dust Weather in Lanzhou City |
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| LI Yu-lin,TUO Wan-quan,CUI Jian-yuan.Comparison of Chemical Composition between Dustfall under Dust and Non-dust Weather in Lanzhou City[J].Journal of Desert Research,2006,26(4):648-651. |
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| Authors: | LI Yu-lin TUO Wan-quan CUI Jian-yuan |
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| Institution: | Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China |
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| Abstract: | The dustfall samples collected under typical dust and non-dust weather were analyzed to examine their composition in Lanzhou.The results showed that the concentration of Si,Ca,Al,Fe and Si,K,Ca,Al in aeolian dust under dust and non-dust weather are relatively higher,as well the concentration of Ti is lower in both samples.The microelement with higher concentration in dust and non-dust samples are Mn,Ba,Zn,Sr and Mn,Ba,Sr,Zr,respectively.Furthermore,the microelement with lower concentration in dust and non-dust samples both are Nb,Co,Y and As.The ranking order of primary element and microelement show little differences between dust and non-dust samples,but the abundance value of same element in two samples exist greatly variance,which means two samples come from different sources.Si,Fe,Mg,K,Na,Ti,V,Mn,Co,Ni,Rb,Sr,Y,Zr,Nb in non-dust samples are mainly come from the earth crust;but Ca,Cr,Cu,Ba,Pb,Zn,As are contributed from environmental pollution sources,among them Pb,Zn and As are the main polluting elements.The most of elements in dust sample are contributed by aeolian dust from the place out of Lanzhou.Several elements such as Pb,Zn,As,Cu,Cr,K,Ni maybe come from the minerals aerosol mixed with polluted aeolian dust in the process of transport. |
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| Keywords: | element dust weather non-dust weather dustfall |
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