Oxidative Degradation of Higher-Molecular-Weight Aromatic Amine Compounds Is a Potential Source of Anilinium in Urban Aerosols DOI
Lin Gui, Yu Xu, Yi You

et al.

Environmental Science & Technology Letters, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 28, 2024

Aminiums are significant components of organic aerosols with intense research on aliphatic aminiums. However, the mechanisms formation aromatic aminiums in urban remain elusive. Highly time-resolved PM2.5 samples were collected center Shanghai (China) during winter to investigate origin and The dominant aminium groups (mainly dimethylaminium monomethylaminium). Anilinium was third most abundant aminium. concentrations anilinium total showed higher levels daytime weekdays. This finding combined source apportionment analysis suggested that daily weekly scale variations anthropogenic activities (e.g., traffic for commuting) mainly responsible fluctuations (particularly aminiums). acid dependence significantly stronger than formation. Aliphatic negatively positively correlated ozone, respectively, suggesting oxidative processes weakened abundance but promoted molecular characterization atmospheric degradation higher-molecular-weight amine compounds an important mechanism aerosols. Thus, this study provides novel insights into

Language: Английский

The critical role of aqueous-phase processes in aromatic-derived nitrogen-containing organic aerosol formation in cities with different energy consumption patterns DOI Creative Commons
Yi-Jia Ma, Yu Xu, Ting Yang

et al.

Atmospheric chemistry and physics, Journal Year: 2025, Volume and Issue: 25(5), P. 2763 - 2780

Published: March 4, 2025

Abstract. Nitrogen-containing organic compounds (NOCs) impact air quality and human health. Here, the abundance, potential precursors, main formation mechanisms of NOCs in PM2.5 during winter were compared for first time among Haerbin (dependent on coal heating), Beijing (natural gas as heating energy), Hangzhou (no centralized policy). The total signal intensity CHON+, CHN+, CHON− was highest lowest Hangzhou. Anthropogenic aromatics accounted 73 %–93 % all identified precursors Haerbin. Although abundance aromatic-derived lower than Haerbin, also contributors to NOC Beijing. exhibited levels aromatic precursors. Furthermore, non-metric multidimensional scaling analysis indicated an overall reduction fossil fuel combustion pollution along route from We found that aqueous-phase processes (mainly condensation, hydrolysis, or dehydration reduced mainly oxidization hydrolysis oxidized NOCs) can promote transformation produce NOCs, leading most significant increase (particularly haze days). Reduced precursor emissions (the lowest) constrained NOCs. results suggest aerosol coal-dependent cities is controlled by anthropogenic processes. Thus, without effective emission controls, through may still pose a large threat quality.

Language: Английский

Citations

0
Amino Acid and Amine Compounds in Fine Aerosol Particles: A Review of Determination Methods, Abundances, Origins, and Atmospheric Processes DOI
Yu Xu, Hong‐Wei Xiao, Hao Xiao

et al.

Aerosol Science and Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: March 6, 2025

Language: Английский

Citations

0
Non-biogenic sources are an important but overlooked contributor to aerosol isoprene-derived organosulfates during winter in northern China DOI Creative Commons
Ting Yang, Yu Xu, Yu-Chen Wang

et al.

Atmospheric chemistry and physics, Journal Year: 2025, Volume and Issue: 25(5), P. 2967 - 2978

Published: March 12, 2025

Abstract. Previous measurement–model comparisons of atmospheric isoprene levels showed a significant unidentified source in some northern Chinese cities during winter. Here, spatial variability winter aerosol organosulfate (OS) formation typical southern (Guangzhou and Kunming) (Xi'an Taiyuan) cities, China, was investigated to reveal the influence potential non-biogenic contributor on OS pollution levels. Monoterpene-derived OSs were significantly higher than which attributed temperature-dependent emission monoterpenes (i.e., temperatures drove more monoterpene emissions). However, isoprene-derived (OSi) opposite trend, with cities. Principal component analysis combined field simulation combustion experiments suggested that biomass burning rather gasoline, diesel, coal contributed abundance OSi The comparison anthropogenic molecular characteristics between particles released from various sources ambient stronger fossil fuel activities promoted considerable OSs. Overall, this study provides direct evidence for first time can contribute China

Language: Английский

Citations

0
Oxidative Degradation of Higher-Molecular-Weight Aromatic Amine Compounds Is a Potential Source of Anilinium in Urban Aerosols DOI
Lin Gui, Yu Xu, Yi You

et al.

Environmental Science & Technology Letters, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 28, 2024

Aminiums are significant components of organic aerosols with intense research on aliphatic aminiums. However, the mechanisms formation aromatic aminiums in urban remain elusive. Highly time-resolved PM2.5 samples were collected center Shanghai (China) during winter to investigate origin and The dominant aminium groups (mainly dimethylaminium monomethylaminium). Anilinium was third most abundant aminium. concentrations anilinium total showed higher levels daytime weekdays. This finding combined source apportionment analysis suggested that daily weekly scale variations anthropogenic activities (e.g., traffic for commuting) mainly responsible fluctuations (particularly aminiums). acid dependence significantly stronger than formation. Aliphatic negatively positively correlated ozone, respectively, suggesting oxidative processes weakened abundance but promoted molecular characterization atmospheric degradation higher-molecular-weight amine compounds an important mechanism aerosols. Thus, this study provides novel insights into

Language: Английский

Citations

2