Chemodiversity of organic nitrogen emissions from light-duty gasoline vehicles is governed by engine displacements and driving speed

被引:0
作者
Han, Huixia [1 ,2 ]
Du, Hongxuan [1 ]
Chen, Shuang [1 ]
Xu, Yisheng [1 ,2 ]
Ren, Lihong [1 ]
Chen, Yu [2 ]
Cai, Yeguang [2 ]
Wang, Kexin [2 ]
Yang, Xinping [3 ]
Fu, Mingliang [3 ]
Ding, Yan [3 ]
Fu, Pingqing [4 ]
机构
[1] Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China
[2] Chinese Res Acad Environm Sci Environm Technol & E, China Acad Environm Sci, Beijing 100012, Peoples R China
[3] Chinese Res Inst Environm Sci, State Environm Protect Key Lab Vehicle Emiss Contr, Beijing 100012, Peoples R China
[4] Tianjin Univ, Sch Earth Syst Sci, Inst Surface Earth Syst Sci, Tianjin 300072, Peoples R China
关键词
Vehicle emissions; Organic nitrogen; FT-ICR MS; Molecular composition; Light-duty gasoline vehicles (LDGVs); Oxidation process; AEROSOL FORMATION; SULFURIC-ACID; MOLECULAR CHARACTERIZATION; CHEMICAL EVOLUTION; NO3; OXIDATION; ALPHA-PINENE; MASS; CARBON; IDENTIFICATION; MATTER;
D O I
10.1016/j.scitotenv.2024.170792
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Organic nitrogen emissions from light -duty gasoline vehicles (LDGVs) is believed to play a pivotal role in atmospheric particulate matter (PM) in urban environments. Here, the characterization of organic nitrogen emitted by LDGVs with varying engine displacements at different speed phases was analyzed using a Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) at molecular level. For the LDGV with small engine displacements, the nitrogen -containing organic (CHON) compounds exhibit higher abundance, molecular weight, oxygen content and aromaticity in the extra -high-speed phase. Conversely, for the LDGV with big engine displacements, more CHON compounds with elevated abundance, molecular weight, oxygen content and aromaticity were observed in the low -speed phase. Our study assumed that the formation of CHON compounds emitted from LDGVs is mainly the oxidation reaction during fuel combustion, so the potential precursor -product pairs related to oxidation process were used to study the degree of combustion reaction. The results show that the highest proportion of oxidation occurs during extra -high-speed phase for LDGV with small engine displacements, and during low -speed phase for LDGV with big engine displacements. These results offer a novel perspective for comprehending the mechanism behind vehicle emissions formation and contribute valuable insights for crafting effective air pollution regulations.
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页数:11
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