Characterization of dust and non-dust aerosols with SEM/EDX
Characterization of dust and non-dust aerosols with SEM/EDX
复制标题
使用 SEM/EDX 表征粉尘和非粉尘气溶胶
DOI：
10.1007/bf02919381
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发表时间：
2006
影响因子：
1.6
通讯作者：
Zhang Man
中科院分区：
文献类型：
--
作者：
Q. Jianhua;Liu Xianguo;Feng Lijuan;Zhang Man
2002年3月，在青岛沿海沿着采集了沙尘暴前和沙尘暴期间的总悬浮颗粒物（TSP）样品。为了进行比较，在三个地点之一收集了PM10（空气动力学直径小于10 μm的颗粒物）样本。采用扫描电子显微镜（SEM/EDX）对TSP和PM10样品进行了形态观察和成分分析。结果表明，不同形貌的颗粒具有不同的元素组成，但对于非粉尘样品，相似形貌的颗粒并不总是具有相同的元素组成。不同地点的非尘埃粒子的形态和组成不同。非尘埃样品中，分形颗粒和球形颗粒主要存在于粗粒级中，而在细粒级（<10 μm）中，则存在由细小颗粒聚集而成的含有地壳元素的絮状物。与非粉尘颗粒物相比，粉尘颗粒物在形态、粒径和组成上更均匀。尘埃颗粒形状不规则，粒径分布均匀，含有Mg、Al、Si、Ca、Fe等地壳元素，硫含量较高，表明青岛地区特定环境下尘埃颗粒表面发生了均相和非均相反应。
Total suspended particulate (TSP) samples were collected at three sites along the coast of Qingdao, China, before and during a major dust storm in March, 2002. For comparison, PM10 (particulate matter with aerodynamic diameters less than 10 μm) samples were collected at one of the three sites. The morphological observation and compositional analysis of bulk and individual particles were performed by using scanning electron microscopy equipped with an energy dispersive X-ray system (SEM/EDX) for the TSP and PM10 samples. The results showed that the particles of different kinds of morphology had different elemental compositions, but the particles of similar morphology did not always have the same elemental composition for non-dust samples. The morphology and composition of non-dust particles were different at different sites. The fractal and spherical particles existed mainly in the coarse fraction for non-dust samples, while in the fine mode (<10 μm) there were floccules formed by fine particles flocking together and containing crustal elements. Compared with the non-dust particles, the dust particles were more homogeneous in terms of morphology, particle size and composition. Particles with irregular shapes and well-distributed sizes dominated in the dust samples, containing crustal elements such as Mg, Al, Si, Ca, Fe,etc. The high sulfur content indicated that homogeneous and heterogeneous reactions took place on the surfaces of the dust particles in the specific environment of Qingdao.