Chemical and Morphological Study of PM10 Analysed by SEM-EDS
Chemical and Morphological Study of PM10 Analysed by SEM-EDS
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DOI：
10.4236/ojap.2014.34012
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发表时间：
2014-12
期刊：
影响因子：
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通讯作者：
R. Ramirez-Leal;M. Valle-Martinez;M. Cruz-Campas
中科院分区：
文献类型：
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作者：
R. Ramirez-Leal;M. Valle-Martinez;M. Cruz-Campas
单颗粒表征可以提供污染气溶胶粒径分布和化学成分演变的信息。这项工作描述了使用扫描电子显微镜（SEM）结合x射线色散能谱（EDS）来表征2013年1月至2013年10月从Sonora Hermosillo市的三个区域收集的PM10过滤器上的无机大气颗粒样本。将每个过滤器2平方厘米的部分浸入试管内的异丙醇中5分钟，将收集到的颗粒从过滤器中分离出来，对样品进行初步处理。然后，将悬浮液的等分物置于样品支架上并放入扫描电镜。在单个颗粒中发现的不同元素有Al、Ba、Ca、Cl、Cr、Cu、Fe、K、Mg、Mn、Na、Pb、S、Si、Ti和U。主要元素有Al （17.10 At%）、Si （10.17 At%）、Ba （5.90 At%）、Fe （5.45 At%）和U （2.32 At%）。这些颗粒根据形态和元素组成被分类为：铝硅酸盐颗粒、氯化钠盐、硫酸盐、金属颗粒、钡和铀。这些颗粒的形态和化学成分说明了该区域内丰富的自然元素。然而，所提出的一些因素与人类活动直接相关，从公共卫生和环境的角度来看，它们具有很大的意义。
Single particle characterization can provide information on the evolution of size distribution and chemical composition of pollution aerosol. The work described the use of Scanning Electron Microscopy (SEM) combined with X-ray Dispersive Energy Spectrometry (EDS) to characterize inorganic atmospheric particles samples collected on PM10 filters from January 2013 to October 2013 from three zones within the city of Hermosillo, Sonora. Specimens were initially processed by separating the collected particles from the filters by means of submersing a 2 cm2 section of each filter into isopropilic alcohol within a test tube for 5 minutes. Then, an aliquot of the suspension was placed over a sample holder and into the SEM. The different elements found amongst individual particles were Al, Ba, Ca, Cl, Cr, Cu, Fe, K, Mg, Mn, Na, Pb, S, Si, Ti and U. The predominant elements are Al (17.10 At%), Si (10.17 At%), Ba (5.90 At%), Fe (5.45 At%) and U (2.32 At%). The particles were classified into groups based on morphology and elemental composition: particles of aluminosilicate, salts of sodium chloride, sulfates, metal particles, barium and uranium. These particles morphology and chemical composition, illustrate an abundance of natural elements within the zone. However, some of the elements presented are directly related with human activities, and are of much interest from the public health and environmental perspectives.