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北京市沙尘天气中矿物单颗粒的物理化学特征

陈雁菊 时宗波 贺克斌 马永亮 刘 燕

陈雁菊, 时宗波, 贺克斌, 马永亮, 刘 燕. 北京市沙尘天气中矿物单颗粒的物理化学特征[J]. 环境科学研究, 2007, 20(1): 52-57.
引用本文: 陈雁菊, 时宗波, 贺克斌, 马永亮, 刘 燕. 北京市沙尘天气中矿物单颗粒的物理化学特征[J]. 环境科学研究, 2007, 20(1): 52-57.
CHEN Yan-ju, SHI Zong-bo, HE Ke-bin, MA Yong-liang, LIU Yan. Physico-Chemical Characteristics of Individual Mineral Particles Collected during Dust Storm Periods in Beijing[J]. Research of Environmental Sciences, 2007, 20(1): 52-57.
Citation: CHEN Yan-ju, SHI Zong-bo, HE Ke-bin, MA Yong-liang, LIU Yan. Physico-Chemical Characteristics of Individual Mineral Particles Collected during Dust Storm Periods in Beijing[J]. Research of Environmental Sciences, 2007, 20(1): 52-57.

北京市沙尘天气中矿物单颗粒的物理化学特征

基金项目: 国家自然科学基金资助项目(20477020)

Physico-Chemical Characteristics of Individual Mineral Particles Collected during Dust Storm Periods in Beijing

  • 摘要: 应用场发射扫描电子显微镜和X射线能谱仪,研究了2005年4月北京市区2次典型沙尘天气PM10样品中矿物单颗粒的形貌、数量-粒度分布和化学组成.研究表明:沙尘天气样品中的矿物颗粒呈边缘锋利的不规则状;数量-粒度分布在1.0~1.5 μm出现明显的峰值.根据X射线能谱的定量数据,将721个矿物单颗粒分为7类.沙尘天气样品中的矿物颗粒主要以硅铝酸盐和石英矿物为主,并且有富Ca颗粒出现.大部分颗粒是2种或更多种矿物的内部混合物.沙尘天气富Ca颗粒占矿物单颗粒总数的5.9%,主要以CaCO3以及硅铝酸盐或石英的混合物的形式存在;非沙尘天气样品中富Ca颗粒含量高达14.5%,其中约有一半来自人为源排放.单个矿物颗粒中Ca含量以及m(Ca)/m(Al)可以用来区分外来沙尘源与本地矿物颗粒.

     

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  • 刊出日期:  2007-02-25

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