在线表征萘二次有机气溶胶硝基多环芳烃

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Abstract Nitrated Polycyclic aromatic hydrocarbons (NPAHs) widely exist in atmospheric aerosol particles and are important components of brown carbon. Naphthalene and other polycyclic aromatic hydrocarbons (PAHs) are vital precursors of NPAHs. To explore the effect of NO₂ on formation of NPAHs, the NPAHs components in secondary organic aerosol (SOA) formed from the photooxidation of naphthalene with different concentrations of NO₂ were on-line measured using aerosol laser time-of-flight mass spectrometer (ALTOFMS) in this study. Experimental results demonstrated that NO₂ had promotion effect on the generation of NPAHs and formation of SOA. Using ALTOFMS on-line detection, followed by Fuzzy C-means (FCM) algorithm cluster analysis, and combined with off-line electrospray ionization mass spectrometer verification, it was determined that naphthols and carboxyls were the main components of naphthalene SOA particles without NO₂, and nitro-naphthalene, dinitro-naphthalene, nitro-naphthol, dinitro-naphthol and their derivatives via the nitration of OH-naphthalene adduct and naphthol products of naphthalene were identified as the major constituents of SOA with NO₂. These provided the experimental basis for exploring the chemical components and formation mechanism of NPAHs under the background of high NO_x concentration in urban atmosphere.

Key words： nitrated polycyclic aromatic hydrocarbons naphthalene secondary organic aerosol laser desorption/ionization reaction mechanisms

Received: 16 December 2021

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X513

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	Articles by authors
	HU Hui-min
	HUANG Ming-qiang
	ZHU Min-cong
	WANG Wei-chao
	GU Xue-jun
	HU Chang-jin
	ZHAO Wei-xiong
	ZHANG Wei-jun

Cite this article:

HU Hui-min,HUANG Ming-qiang,ZHU Min-cong等. On-line characterization of nitrated polycyclic aromatic hydrocarbons in naphthalene secondary organic aerosol[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(7): 3068-3076.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I7/3068

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