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DOI	10.1016/j.atmosenv.2021.118430
	15N natural abundance of vehicular exhaust ammonia, quantified by active sampling techniques
	Song L.; Walters W.W.; Pan Y.; Li Z.; Gu M.; Duan Y.; Lü X.; Fang Y.
发表日期	2021
ISSN	1352-2310
卷号	255
英文摘要	Vehicular exhaust has been identified as an important ammonia (NH3) emission source in urban areas using the stable isotope tracer technique (δ15N); however, its δ15N signature remains poorly constrained due to difficulties in concentrating and speciating NHx (NH3 + particulate NH4+). In this study, we deployed two active sampling techniques, MCIs (Multi-nozzle Cascade Impactor sampler; “particle-gas” order) and CCSCs (ChemComb Speciation Cartridge sampler; “gas-particle” order), to collect vehicular exhaust NHx in a long urban tunnel in Shenyang, China, and quantified the 15N from the collected NH3 and NH4+. While no significant difference in tunnel NH3 concentrations between the two samplers was observed (n = 21), the δ15N-NH3 was slightly higher using the MCIs (6.3 ± 1.6‰) compared to the CCSCs (4.8 ± 2.3‰) during the tunnel operation period. This minor absolute difference of 1.5 ± 2.8‰ may derive from denuder-saturation used within the CCSCs that lead to NHx speciation ambiguity, which also caused significant δ15N-pNH4+ differences between the two sampling approaches. Our results suggest that both active samplers can well characterize the δ15N-NHx in the ambient environment, but the “particle - gas” sampling approach performs better in elevated NH3 concentration environments. We recommend that the δ15N value of 6.3‰ is used as the isotope end member for vehicle NH3 when performing NH3 source apportionment. © 2021 Elsevier Ltd
关键词	15N natural abundance Active samplers Air N pollution Urban tunnel Vehicular ammonia emissions
语种	英语
scopus关键词	Isotopes; $+15$/N; 15N natural abundance; Active samplers; Active sampling; Air N pollution; Natural abundance; NH$-3$; Sampling technique; Urban tunnel; Vehicular ammonia emission; Ammonia; ammonia; nitrogen 15; concentration (composition); exhaust emission; sampler; source apportionment; stable isotope; tracer; traffic emission; urban area; air sampling; Article; China; concentration (parameter); exhaust gas; priority journal; urban area; China; Liaoning; Shenyang
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248424
作者单位	CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, Liaoning 110016, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Institute at Brown for Environment and Society, Brown University, Providence, RI 02912, United States; State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; College of Biological Science and Technology, Central South University of Forestry and Technology, Changsha, Hunan 410004, China; Key Laboratory of Stable Isotope Techniques and Applications, Shenyang, Liaoning 110016, China
推荐引用方式 GB/T 7714	Song L.,Walters W.W.,Pan Y.,et al. 15N natural abundance of vehicular exhaust ammonia, quantified by active sampling techniques[J],2021,255.
APA	Song L..,Walters W.W..,Pan Y..,Li Z..,Gu M..,...&Fang Y..(2021).15N natural abundance of vehicular exhaust ammonia, quantified by active sampling techniques.ATMOSPHERIC ENVIRONMENT,255.
MLA	Song L.,et al."15N natural abundance of vehicular exhaust ammonia, quantified by active sampling techniques".ATMOSPHERIC ENVIRONMENT 255(2021).