乌鲁木齐市PM<sub>2.5</sub>和PM<sub>2.5~10</sub>中碳组分季节性变化特征

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Abstract

Filter-based PM_2.5~10 and PM_2.5 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 PM_2.5 and PM_2.5~10 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 PM_2.5, and 2.63 μg/m³ and 0.57 μg/m³ in PM_2.5~10, respectively. OC and EC in PM_2.5 and PM_2.5~10 demonstrated similar seasonal variations with the highest values observed in winter. Carbonaceous aerosols were mainly concentrated in PM_2.5. 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 PM_2.5 and PM_2.5~10 ranged 2.31~11.98 μg/m³ and 0.38~1.49 μg/m³, respectively.

Key words： PM_2.5 PM_2.5~10 organic carbon element carbon Urumqi

Received: 15 June 2015

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X513

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2016/V36/I2/356

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