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Morphological and elemental classification of fine particles by STEM-EDX individual particle analysis

机译：茎EDX单个颗粒分析的形态学和元素分类细颗粒

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摘要

Ambient particles with a diameter less than 2.5 μm (fine particles) affect the radiation balance, cloud formation, visibility impairment, and result possibly an adverse health consequence since they can enter the human respiratory system. Several epidemiologic studies have shown that the increased mortality and morbidity from respiratory and cardiovascular disease in adults were associated with the mass concentration of such respirable airborne particles in urban areas (Dockery and Pope, 1994). Therefore, it is needed to examine the physic-chemical characteristics of fine particles. The mass concentrations, size, composition, mixing state, and sources of different ambient particle types in certain urban areas are strongly affected by long-range transport. During long-range transport, particles could change their properties due to coagulation, cloud processes, condensation or reactions with air pollutants by various heterogeneous pathways. Because of their diverse sources and formation pathways, the particle consists of various chemical constituents with different morphology. In this study, the elemental compositions, morphologies and mixing states of individual aerosol particles were analyzed using scanning transmission electron microscopy coupled with energy dispersive X-ray (STEM-EDX) technique.
机译：直径小于2.5μm（细颗粒）的环境颗粒会影响辐射平衡，云层，可见度损伤，并产生可能存在不利的健康后果，因为它们可以进入人类呼吸系统。几项流行病学研究表明，成人呼吸道和心血管疾病的增加和发病率增加与城市地区这种可吸入空气颗粒的质量浓度（码头和教皇，1994）相关。因此，需要检查细颗粒的物理化学特性。某些城市地区在某些城市地区不同环境颗粒类型的质量浓度，尺寸，组成，混合状态和源极受到远程运输的影响。在远程运输过程中，由于各种异质途径，颗粒可以通过凝血，云处理，凝结或与空气污染物的污染物的反应来改变它们的性质。由于它们不同的来源和形成途径，颗粒由各种具有不同形态学的化学成分组成。在该研究中，使用扫描透射电子显微镜与能量分散X射线（STEM-EDX）技术进行分析各种气溶胶颗粒的元素组合物，形态和混合状态。

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