异戊二烯
示踪剂
气溶胶
环境化学
甲苯
化学
化学成分
环境科学
有机化学
共聚物
物理
核物理学
聚合物
作者
Ling Mu,Xin Jiang,Yangyong Li,Xuemei Li,Xiaofan Li,Tian Liu,Ziye Liu,Chuanyang Feng
标识
DOI:10.1016/j.atmosenv.2023.119849
摘要
In this study, 13 secondary organic aerosol (SOA) tracers in PM2.5 were measured in Jinzhong, Shanxi, to investigate the distribution characteristics of SOAs. According to the results, isoprene SOA tracers had the highest annual average concentration at 7.35 ± 14.23 ng/m3, accounting for 57.8% of all tracers by concentration, followed by β-caryophyllene SOA tracer (3.53 ± 2.67 ng/m3, 22.6%), α/β-pinene SOA tracers (2.68 ± 2.23 ng/m3, 18.9%) and toluene SOA tracer (0.11 ± 0.08 ng/m3, 0.7%). The concentrations of isoprene and α/β-pinene SOA tracers in summer and autumn were higher than those in winter and spring, whereas the concentration of β-caryophyllene SOA tracer was higher in autumn and winter than in spring and summer. However, no statistically significant seasonal variation was observed in the concentration of the toluene SOA tracer. According to results for pinolic acid and 3-methyl-1,2,3-butanetricarboxylic acid, α/β-pinene SOA tracers in Jinzhong were fresh in winter and the contribution ratio of β-pinene to SOA formation was higher than that of α-pinene. A correlation analysis also indicated that the high concentrations of isoprene and α/β-pinene SOA tracers in summer were correlated with temperature, whereas the high concentration of the β-caryophyllene SOA tracer in autumn and winter was primarily correlated with biomass burning. According to tracer yield estimation results, plant-derived volatile organic compounds were the main source of SOAs in PM2.5 in Jinzhong, with a contribution ratio of 94%. Isoprene contributed the most to secondary organic carbon concentrations in spring and summer, whereas β-caryophyllene contributed the most in autumn and winter.
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