Physico-chemical characterization and source tracking of black carbon at a suburban site in Beijing

Particles from ambient air and combustion sources including vehicle emission, coal combustion and biomass burning were collected and chemically pretreated with the purpose of obtaining isolated BC（black carbon） samples. TEM（transmission electron microscopy）results indicate that BC from combustion so...

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Bibliographic Details
Published in:Journal of environmental sciences (China) 2015-07, Vol.33 (7), p.188-194
Main Authors: Wang, Hailin, Nie, Lei, Liu, Dan, Gao, Meiping, Wang, Minyan, Hao, Zhengping
Format: Article
Language:English
Subjects:
Air Pollutants - chemistry
Beijing
Black carbon
Characterization
China
Cities
Environmental Monitoring
Microscopy, Electron, Scanning
Microscopy, Electron, Transmission
Oxygen
Soot - chemistry
Source emission
北京
物理化学特性
程序升温氧化
网站
跟踪
透射电子显微镜
郊区
黑碳
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Summary:Particles from ambient air and combustion sources including vehicle emission, coal combustion and biomass burning were collected and chemically pretreated with the purpose of obtaining isolated BC（black carbon） samples. TEM（transmission electron microscopy）results indicate that BC from combustion sources shows various patterns, and airborne BC appears spherical and about 50 nm in diameter with a homogeneous surface and turbostratic structure. The BET（Barrett-Emmett-Teller） results suggest that the surface areas of these BC particles fall in the range of 3-23 m2/g, with a total pore volume of 0.03-0.05 cm3/g and a mean pore diameter of 7-53 nm. The nitrogen adsorption-desorption isotherms are indicative of the accumulation mode and uniform pore size. O2-TPO（temperature programmed oxidation）profiles suggest that the airborne BC oxidation could be classified as the oxidation of amorphous carbon, which falls in the range of 406-490℃ with peaks at 418, 423 and 475℃,respectively. Generally, the BC characteristics and source analysis suggest that airborne BC most likely comes from diesel vehicle emission at this site.
ISSN:1001-0742
1878-7320
DOI:10.1016/j.jes.2015.05.001