TY - JOUR
T1 - Microscopic morphology and size distribution of particles in PM 2.5 of Guangzhou City
AU - Feng, Xidan
AU - Dang, Zhi
AU - Huang, Weilin
AU - Shao, Longyi
AU - Li, Weijun
N1 - Funding Information: Acknowledgements This work was financially supported by the Key Project of National Natural Science Foundation of China (40730741), the State Scholarship Fund of China Scholarship Council (No. 2007U33019), and the Foundation of Zhongkai University of Agriculture and Engineering (No. G3100033). The authors would like to thank professor Guoying Sheng, professor Xinhui Bi and Dr. Jihua Tan, all at Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, for their assistance in the sampling phase of this study. The authors also thank Professor James Irish at South China University of Technology for editing the manuscript.
PY - 2009/9
Y1 - 2009/9
N2 - Samples of airborne PM2.5 particles in Guangzhou urban area were collected during the autumn of 2006 and the spring of 2007. The morphologies and elemental compositions of individual particles were determined by Scanning Electron Microscopy coupled with Energy Dispersive X-ray Spectrometer (SEM-EDX). The obtained images were further analyzed for size distribution by an image analysis system. Based on the morphology, particles in PM2.5 were classified into four groups: soot aggregates, minerals, fly ash and others. The amount of soot aggregates and minerals were higher than that of fly ashes. The distributions of particles by number and size in two seasons were bimodal with 90% less than 1.0 μm in diameter. The primary peak from the autumn samples was in the size range of 0.4∈∼∈0.5 μm, and 0. 3∈∼∈0.4 μm for the spring samples. More soot aggregates (36.1%) and minerals (61.5%) were found than fly ash (2.4%) in autumn, but soot aggregates (89.9%) was the dominant particle type in spring. The size distribution of particles according to the volume was generally opposite to that according to the number. Particles less than 1.0 μm were as high as 89.5% in number but contributed only 18.9% in volume, indicating that fine particles contributed relatively little in volume although existing in large numbers.
AB - Samples of airborne PM2.5 particles in Guangzhou urban area were collected during the autumn of 2006 and the spring of 2007. The morphologies and elemental compositions of individual particles were determined by Scanning Electron Microscopy coupled with Energy Dispersive X-ray Spectrometer (SEM-EDX). The obtained images were further analyzed for size distribution by an image analysis system. Based on the morphology, particles in PM2.5 were classified into four groups: soot aggregates, minerals, fly ash and others. The amount of soot aggregates and minerals were higher than that of fly ashes. The distributions of particles by number and size in two seasons were bimodal with 90% less than 1.0 μm in diameter. The primary peak from the autumn samples was in the size range of 0.4∈∼∈0.5 μm, and 0. 3∈∼∈0.4 μm for the spring samples. More soot aggregates (36.1%) and minerals (61.5%) were found than fly ash (2.4%) in autumn, but soot aggregates (89.9%) was the dominant particle type in spring. The size distribution of particles according to the volume was generally opposite to that according to the number. Particles less than 1.0 μm were as high as 89.5% in number but contributed only 18.9% in volume, indicating that fine particles contributed relatively little in volume although existing in large numbers.
KW - Atmospheric particulate
KW - PM
KW - SEM-EDX
KW - Size distribution
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U2 - 10.1007/s10874-010-9169-7
DO - 10.1007/s10874-010-9169-7
M3 - Article
SN - 0167-7764
VL - 64
SP - 37
EP - 51
JO - Journal of Atmospheric Chemistry
JF - Journal of Atmospheric Chemistry
IS - 1
ER -