The organic molecular composition, diurnal variation, and stable carbon isotope ratios of PM2.5 in Beijing during the 2014 APEC summit
The organic molecular composition, diurnal variation, and stable carbon isotope ratios of PM2.5 in Beijing during the 2014 APEC summit
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2014年APEC峰会期间北京PM2.5有机分子组成、日变化及稳定碳同位素比值
DOI：
10.1016/j.envpol.2018.08.094
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发表时间：
2018
影响因子：
8.9
通讯作者：
Fu Pingqing
中科院分区：
文献类型：
--
作者：
Ren Hong;Kang Mingjie;Ren Lujie;Zhao Yue;Pan Xiaole;Yue Siyao;Li Linjie;Zhao Wanyu;Wei Lianfang;Xie Qiaorong;Li Jie;Wang Zifa;Sun Yele;Kawamura Kimitaka;Fu Pingqing
有机示踪剂可用于调查碳质气溶胶的来源，但在中国尚无充分的研究。为了深入了解北京市碳质气溶胶的日变化、性质以及区域排放控制的影响，在2014年亚太经合组织（APEC）峰会之前（10月15日至11月2日）和期间（11月3日至11月12日）采集了白天/夜间PM2.5样本。使用气相色谱/质谱 (GC/MS) 分析 11 类有机化合物。此外，使用元素分析仪/同位素比质谱仪（EA/irMS）检测了总碳（TC）的稳定碳同位素比（δ13CTC）。大多数有机化合物在夜间比白天更丰富，并且其浓度在APEC期间普遍下降。这些特征与严格的区域排放控制和气象条件有关。 APEC期间δ13CTC的昼夜变化小于APEC峰会前的变化，表明区域输送的气溶胶可能对APEC峰会前北京有机气溶胶的装载起到重要作用。基于有机示踪剂的来源解析表明，生物质燃烧、塑料和微生物排放以及化石燃料燃烧是北京有机气溶胶的重要来源。此外，APEC 之前和期间生物质燃烧对 OC 的类似贡献表明，生物质燃烧是北京及其周边地区 PM2.5 的持续贡献者。
Organic tracers are useful for investigating the sources of carbonaceous aerosols but there are still no adequate studies in China. To obtain insights into the diurnal variations, properties, and the influence of regional emission controls on carbonaceous aerosols in Beijing, day-/nighttime PM2.5samples were collected before (Oct. 15th – Nov. 2nd) and during (Nov. 3rd – Nov. 12th) the 2014 Asia-Pacific Economic Cooperation (APEC) summit. Eleven organic compound classes were analysed using gas chromatography/mass spectrometry (GC/MS). In addition, the stable carbon isotope ratios (δ13CTC) of total carbon (TC) were detected using an elemental analyser/isotope ratio mass spectrometry (EA/irMS). Most of the organic compounds were more abundant during the night than in the daytime, and their concentrations generally decreased during the APEC. These features were associated with the strict regional emission controls and meteorological conditions. The day/night variations of δ13CTCwere smaller during the APEC than those before the APEC the summit, suggesting that regionally transported aerosols are potentially played an important role in the loading of organic aerosols in Beijing before the APEC summit. The source apportionment based on the organic tracers suggested that biomass burning, plastic and microbial emissions, and fossil fuel combustion were important sources of organic aerosols in Beijing. Furthermore, a similar contribution of biomass burning to OC before and during the APEC suggests biomass burning was a persistent contributor to PM2.5in Beijing and its surroundings.