Characteristics of organic and element carbon in fine particles in Lanzhou

doi:10.7523/j.issn.2095-6134.2015.04.010

Abstract

Abstract: A total of 60 PM_2.5 samples were collected during winter and summer seasons in Lanzhou city. OC and EC were measured by the thermal/optical method using DRI-2001A. The results indicated that carbonaceous aerosol in winter was significantly higher than that in summer. The average concentrations of OC and EC were (35.39±13.88) μg/m³ and (13.80±5.41) μg/m³ in winter and (9.74±3.30) μg/m³ and (4.44±2.00) μg/m³ in summer, respectively. The correlation between OC and EC was 0.91 in winter and 0.76 in summer, which revealed that OC and EC had similar sources. The concentrations of SOC were (8.48±6.10)μg/m³ and (3.07±2.20)μg/m³ in winter and summer, and they were about (22.46±11.93)% and (31.29 + 18.51)% of OC in PM_2.5, respectively, which manifested that OC was mainly from primary sources and the contribution of secondary transformation was higher in summer than in winter. Analysis on the eight fractions of carbonaceous aerosol within the different temperature ranges showed that biomass burning had a high contribution for carbonaceous aerosol in PM_2.5 in winter, but vehicle emissions might be the major source in summer.

Key words: PM_2.5, OC, EC, SOC, seasonal variation

CLC Number:

X513

LI Yinghong, DUAN Jingchun, ZHENG Naijia, TAN Jihua, RAO Zhiguo, MA Yongliang, HE Kebin. Characteristics of organic and element carbon in fine particles in Lanzhou[J]. , 2015, 32(4): 490-497.

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