FT-ICR mass spectrometry for molecular characterization of water-insoluble organic compounds in winter atmospheric fine particulate matters  

作　　者：Cuiping Ning Yuan Gao Haoran Yu Haijun Zhang Ningbo Geng Rong Cao Jiping Chen 

机构地区：[1]CAS Key Laboratory of Separation Sciences for Analytical Chemistry,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian,Liaoning 116023,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Environmental Sciences》2022年第1期51-60,共10页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.91643104)for the financial support。

摘　　要：Water-insoluble organic compounds(WIOCs)are an important fraction of atmospheric fine particulate matters(PM_(2.5)),which could affect the climate system and threaten human health potentially.In this study,molecular characterization of WIOCs in PM_(2.5) were investigated by 15 T Fourier transform ion cyclotron resonance mass spectrometry(FT-ICR MS)with atmospheric pressure photoionization(APPI)source in positive ion mode.A total of 2573 and1875 molecular formulas were identified in WIOCs extracted by dichloromethane,which were collected in hazy and normal days,respectively.The identified molecular formulas were further classified into four major subgroups,including CH,CHN,CHO and CHNO compounds.CHO compounds predominated in WIOCs,accounting for more than 60%in both samples.CHNO compounds(26.6%)and CH compounds(16.1%)were the second highest subgroups in WIOCs from the hazy days and normal days,respectively.The relative abundance and number of nitro-substituted aromatic compounds were significantly higher in hazy days than in normal days.The molecular composition of WIOCs was more complex in hazy days while more aromatic compounds were identified in normal days.

关 键 词：PM_(2.5) WIOCs FT-ICR MS Molecular characteristics Polycyclic aromatic hydrocarbon 

分 类 号：X831[环境科学与工程—环境工程]