Microscopic characteristics and size distribution of PM10 in a coal mine city

作者：Song Xiao Yan^*; Shao Long Yi; Song Jian Jun; Qiao Yu Shuang

来源：Journal of China University of Mining & Technology, 2011, 40(2): 292-297.

• FESEM
• Field emission scanning electron microscopy
• High resolution
• Mass concentration
• Microscopic characteristics
• Mineral particles
• PM10
• Size ranges
• Soot aggregates
• Spherical particle
• Unimodal

Microscopic characteristics and size distribution of different types of individual particulates were investigated by high resolution Field Emission Scanning Electron Microscopy (FESEM) and image analysis (IA). Four microscopic types of particles in the PM10 were classified, including minerals, soot aggregates, spherical particles and unresolved particles. The minerals, soot aggregates and spherical particles accounted for approximately 41.2%, 28.0% and 30.8% by number, and 71.5%, 22.3% and 6.3% by volume, respectively. Number-size distribution of PM10 exhibited a unimodal pattern with the peak in 0.1-0.4μm range, while the volume-size distribution of PM10 revealed that the mineral particles bigger than 1μm were dominant components. The abundant spherical particles and regular minerals present in the PM10 samples might suggest a serious chemical reaction in atmosphere during summer. When influenced by windy weather, the mass concentration of PM10 became lower, with particles mainly distributed in the size rang 0.1-0.4μm by number. Under the floating dust weather, the mass concentration of PM10 was high and most PM10 particles were distributed in the size range of 0.1-0.4 and 1-2.5μm by number, the irregular minerals bigger than 1μm could account for up to 80% in PM10 by volume.

• 出版日期2011
• 单位中国矿业大学（北京）