Seasonal changes of carbonaceous speeies in PM2.5, PM2.5~10 in Urumqi
WANG Guo1, DILNUR Talip1, MAILIKEZHATI Maihemuti1, ABULIKEMU Abulizi1, WANG Xin-ming2, DING Xiang2
1. College of Chemistry And Chemical Engineering, Xinjiang University, Urumqi 830046, China;
2. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
Filter-based PM2.5~10 and PM2.5 samples were collected at an urban site in Urumqi during January-December 2011, and analyzed for the organic carbon (OC) and elemental carbon (EC) mass concentrations by a thermal/optical carbon analyzer. The characteristics of carbonaceous aerosols in Urumqi were preliminarily investigated with the size distribution of OC and EC, OC/EC ratios and their correlations; and the mass concentrations of secondary organic carbon (SOC) were estimated by using the OC/EC ratio or EC-tracer method. The results showed that PM2.5 and PM2.5~10 had annual average mass concentrations of 92.8 μg/m3 and 64.7 μg/m3, respectively; while OC and EC had annual average mass concentrations of 13.85 μg/m3 and 2.38 μg/m3 in PM2.5, and 2.63 μg/m3 and 0.57 μg/m3 in PM2.5~10, respectively. OC and EC in PM2.5 and PM2.5~10 demonstrated similar seasonal variations with the highest values observed in winter. Carbonaceous aerosols were mainly concentrated in PM2.5. OC/EC ratios ranged from 3.67 to 11.21. Good linear correlations were found between OC and EC in summer and autumn (R2>0.65). Estimated SOC in PM2.5 and PM2.5~10 ranged 2.31~11.98 μg/m3 and 0.38~1.49 μg/m3, respectively.
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