The study of atmospheric fine particles by transmission electron microscopy
大气细颗粒物的透射电子显微镜研究

This paper analyzed the morphological characteristics and aggregate state of the fine particles collected at the urban and background sites of Beijing by means of Transmission Electron Microscopy (TEM). Coupled with the characteristics from the energy dispersive X-ray spectrometry (EDX) and Selected Area Electron Diffraction (SAED) analyses, the typical fine particles in Beijing were classified into five categories of single particle types, including soot aggregates, fly ashes, mineral particles, sulfates and organic particles. The possible sources origins of these particles were discussed in more detail. The TEM analyses revealed that the relative proportions of these different types of particles at the urban site were different from those at the background site, indicating that the pollution sources of fine particles were different between the urban and background sites. The TEM images showed that these different types of particles tended to aggregate each other.