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DOI	10.5194/acp-19-2861-2019
	Unraveling the role of silicon in atmospheric aerosol secondary formation: A new conservative tracer for aerosol chemistry
	Lu D.; Tan J.; Yang X.; Sun X.; Liu Q.; Jiang G.
发表日期	2019
ISSN	16807316
起始页码	2861
结束页码	2870
卷号	19 期号:5
英文摘要	Aerosol particles are ubiquitous in the atmosphere and affect the quality of human life through their climatic and health effects. The formation and growth of aerosol particles involve extremely complex reactions and processes. Due to limited research tools, the sources and chemistry of aerosols are still not fully understood, and until now have normally been investigated by using chemical species of secondary aerosols (e.g., ${NH}_{4}^{+}$ , ${NO}_{3}^{-}$ , ${SO}_{4}^{2 -}$ , SOC) as tracers. Here we investigated the role of silicon (Si), an ubiquitous but relatively inert element, during the secondary aerosol formation process. We analyzed the correlation of Si in airborne fine particles (PM2.5) collected in Beijing-a typical pollution region-with the secondary chemical species and secondary particle precursors (e.g., SO2 and NOx). The total mass of Si in PM2.5 was found to be uncorrelated with the secondary aerosol formation process, which suggested that Si is a new conservative tracer for the amount of primary materials in PM2.5 and can be used to estimate the relative amount of secondary and primary compounds in PM2.5. This finding enables the accurate estimation of secondary aerosol contribution to PM2.5 by using Si as a single tracer rather than the commonly used multiple chemical tracers. In addition, we show that the correlation analysis of secondary aerosols with the Si isotopic composition of PM2.5 can further reveal the sources of the precursors of secondary aerosols. Therefore, Si may provide a new tool for aerosol chemistry studies. © Author(s) 2019.
语种	英语
scopus关键词	aerosol; aerosol composition; aerosol formation; atmospheric chemistry; concentration (composition); particulate matter; silicon; source apportionment; Beijing [Beijing (ADS)]; Beijing [China]; China
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144595
作者单位	State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China; Institute of Environment and Health, Jianghan University, Wuhan, 430056, China
推荐引用方式 GB/T 7714	Lu D.,Tan J.,Yang X.,et al. Unraveling the role of silicon in atmospheric aerosol secondary formation: A new conservative tracer for aerosol chemistry[J],2019,19(5).
APA	Lu D.,Tan J.,Yang X.,Sun X.,Liu Q.,&Jiang G..(2019).Unraveling the role of silicon in atmospheric aerosol secondary formation: A new conservative tracer for aerosol chemistry.Atmospheric Chemistry and Physics,19(5).
MLA	Lu D.,et al."Unraveling the role of silicon in atmospheric aerosol secondary formation: A new conservative tracer for aerosol chemistry".Atmospheric Chemistry and Physics 19.5(2019).