Characteristics of elemental carbon and organic carbon in PM10 during spring and autumn in Chongqing, China--颗粒学报PARTICUOLOGY

Ye, D., Zhao, Q., Jiang, C., Chen, J., & Meng, X. (2007). Characteristics of elemental carbon and organic carbon in PM10 during spring and autumn in Chongqing, China. China Particuology, 5(4), 255–260. https://doi.org/10.1016/j.cpart.2007.03.009

Characteristics of elemental carbon and organic carbon in PM₁₀during spring and autumn in Chongqing, China

Di Ye ^a *, Qi Zhao ^a, Changtan Jiang ^a, Jun Chen ^a, Xiaoxing Meng ^a

a Chongqing Academy of Environmental Science, Chongqing 400020, China

10.1016/j.cpart.2007.03.009

Volume 5, Issue 4, August 2007, Pages 255-260

Received 31 December 2006, Accepted 23 March 2007, Available online 16 July 2007.

E-mail: david0672_cn@sina.com.cn

Highlights

Abstract

PM₁₀ (particulate matter with aerodynamic diameter less than 10 μm) samples were collected simultaneously at nine urban sites and one urban background site during two intensive observation campaigns in 2006. Concentrations of elemental carbon (EC) and organic carbon (OC) in PM₁₀ were analyzed using an element analyzer. The characteristics regarding spatial and seasonal distribution patterns of OC and EC concentrations and their contributions to PM₁₀ mass, as well as correlation between OC and EC, were investigated in detail. The average OC and EC concentrations for urban sites were 57.5 ± 20.8 and 8.3 ± 3.9 μg/m³, respectively, both being around three times higher than those for urban background site. As a whole, EC concentrations did not show distinct seasonal variations, though OC concentrations were generally higher in autumn than in spring. For urban sites, total carbonaceous aerosol (TCA) accounted for 33.2% in spring and 35.0% in autumn of PM₁₀ mass. The OC and EC concentrations were found significantly correlated to each other both in spring and in autumn, implying the existence of similar emission sources such as coal combustion. The OC/EC ratios generally exceeded 2.0, indicating the presence of secondary organic carbon (SOC), whose estimated concentration for urban Chongqing was 26.7 and 39.4 μg/m3, accounting for 48.9 and 61.9% of the total OC observed in the samples, in spring and in autumn, respectively.

Graphical abstract

Keywords

PM₁₀; Elemental carbon; Organic carbon; Secondary organic carbon; Chongqing

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