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Pollution characteristics of carbonaceous aerosols in PM2.5 during winter in Lanzhou
Received date: 2013-07-26
Revised date: 2013-11-29
Online published: 2014-05-15
For studying the concentration characteristics and sources of carbonaceous aerosols during winter in Lanzhou, daily PM2.5 samples were collected during the period from 5 Dec to 12 Dec in 2011. Elemental carbon(EC) and organic carbon(OC) were measured by the thermal/optical method using DRI-2001A. The results indicated that the average mass concentrations of EC and OC were 7.48 and 22.71 μg/m3, respectively, during winter in Lanzhou.Snow had significant effect on the ambient concentrations of EC and OC. The correlation coefficient between EC and OC was 0.98,which revealed that the emission sources of carbonaceous aerosol were relatively simple during winter in Lanzhou and EC and OC had the same sources. Mass concentration of SOC was 3.26 μg/m3, and it was only 14.4% of the concentration of OC in PM2.5. Factor analysis on the eight carbon fractions of carbonaceous aerosol indicated that coal combustion and vehicle emissions were the major sources for carbonaceous aerosol in PM2.5.
Key words： PM2.5; OC; EC; SOC; factor analysis
LI Gang , SHI Guangyu , LI Hongyu , DENG Zuqin . Pollution characteristics of carbonaceous aerosols in PM2.5 during winter in Lanzhou[J]. Journal of University of Chinese Academy of Sciences, 2014 , 31(3) : 439 -443 . DOI: 10.7523/j.issn.2095-6134.2014.03.021
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