On-line characterization of nitrated polycyclic aromatic hydrocarbons in naphthalene secondary organic aerosol
HU Hui-min1, HUANG Ming-qiang1, ZHU Min-cong1, WANG Wei-chao1, GU Xue-jun2, HU Chang-jin2, ZHAO Wei-xiong2, ZHANG Wei-jun2
1. Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology, College of Chemistry & Chemical Engineering and Environment, Minnan Normal University, Zhangzhou 363000, China; 2. Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
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 NOx concentration in urban atmosphere.
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