Synergetic effects of NH<sub>3</sub> and NO<sub><italic>x</italic></sub> on the production and optical absorption of secondary organic aerosol formation from toluene photooxidation

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Abstract 3 is the most important alkaline gas in the atmosphere and one of the key species affecting the behaviors of atmospheric aerosols. However, the impact of NH3 on secondary organic aerosol (SOA) formation remains poorly understood, especially the dynamic evolution of chemical compositions in the SOA formation process. In this study, a series of chamber experiments were performed to probe the individual and common effects of NH3 and NOx on toluene SOA formation through OH photooxidation. The chemical compositions of toluene SOA were characterized using the Aerodyne high-resolution time-of-flight aerosol mass spectrometer (AMS). The SOA yield increased from 28.1 % in the absence of NH3 to 34.7 % in the presence of NH3 but decreased to 19.5 % in the presence of NOx. However, the highest SOA yield of 42.7 % and the lowest carbon oxidation state (OSC) occurred in the presence of both NH3 and NOx, indicating that the higher-volatility products that formed in the presence of NOx could partition into the particle phase when NH3 was added. This resulted in a synergetic effect on SOA formation when NH3 and NOx co-existed. The heterogeneous reaction was the main pathway by which NH3 participated in SOA formation in the photooxidation process. The synergetic effect of NH3 and NOx was also observed in SOA optical absorption. A peak at 280 nm, which is characteristic of organonitrogen imidazole compounds, was observed in the presence of NH3, and its intensity increased when NOx was added into the chamber. This work improves our understanding of how the synergistic interactions between NH3 and NOx influence SOA formation and offers new insights into mitigating haze pollution.

Standort
Deutsche Nationalbibliothek Frankfurt am Main
Umfang
Online-Ressource
Sprache
Englisch

Erschienen in
Synergetic effects of NH3 and NOx on the production and optical absorption of secondary organic aerosol formation from toluene photooxidation ; volume:21 ; number:23 ; year:2021 ; pages:17759-17773 ; extent:15
Atmospheric chemistry and physics ; 21, Heft 23 (2021), 17759-17773 (gesamt 15)

Urheber
Liu, Shijie
Huang, Dandan
Wang, Yiqian
Zhang, Si
Liu, Xiaodi
Wu, Can
Du, Wei
Wang, Gehui

DOI
10.5194/acp-21-17759-2021
URN
urn:nbn:de:101:1-2021120904212020890026
Rechteinformation
Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
Letzte Aktualisierung
15.08.2025, 07:37 MESZ

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Beteiligte

  • Liu, Shijie
  • Huang, Dandan
  • Wang, Yiqian
  • Zhang, Si
  • Liu, Xiaodi
  • Wu, Can
  • Du, Wei
  • Wang, Gehui

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