A multicomponent kinetic model established for investigation on atmospheric new particle formation mechanism in H2SO4-HNO3-NH3-VOC system.
In: Science of the Total Environment, Jg. 616/617 (2018-03-01), S. 1414-1422
academicJournal
Zugriff:
Secondary new particle formation (NPF) plays a significant role in atmospheric particulate matters ( e.g., PM2.5), and has been studied over the past decades. However, the mechanism of NPF still remains ambiguous, setting significant barrier for PM2.5 mitigations, especially in complex atmosphere with multi-pollutants. Since the NPF process can hardly be observed directly by experiment methods due to the measuring limitations, a multicomponent kinetic model (MKM), which can be used to analyze the process and the mechanism of NPF in H 2 SO 4 -HNO 3 -NH 3 -VOC (Volatile Organic Compounds) system, has been developed in this paper. According to MKM, seven cases with initial concentrations of total precursor vapors (CPV) in the range of 10 7 –10 8 cm − 3 were calculated to analyze the NPF process. Firstly, the 3 nm particle (PM 3nm ) formation rate was calculated via MKM, which showed a good agreement with the previous measurements. Moreover, according to MKM calculation, it is found that the peak value of PM 3nm formation rate, i.e. , J m , is proportional to [CPV] 2 , while the time at which J m occurred, i.e. , t m , is proportional to [CPV] − 1/3 , indicating that the increases in CPV would lead to a significant increase of J m and decrease of t m . That's why NPF bursts immediately and PM2.5 pollution occurs suddenly in heavily pollutant areas. Afterwards, the roles of precursors in H 2 SO 4 -HNO 3 -NH 3 -VOC system were identified. It indicates that H 2 SO 4 , NH 3 and VOC mainly contribute to the early stage of the NPF, while the growth of the nuclei is mainly driven by HNO 3 and NH 3 . And HNO 3 makes increasing contributions at the early stage of NPF with CPV rising (especially above 10 8 cm − 3 ). Thus in high CPV areas, especially for China, HNO 3 should be paid the same attention as H 2 SO 4 , NH 3 and VOC. The findings provide important implications for haze mitigations in China and other industrializing countries with multi-pollutant emission sources. [ABSTRACT FROM AUTHOR]
Titel: |
A multicomponent kinetic model established for investigation on atmospheric new particle formation mechanism in H2SO4-HNO3-NH3-VOC system.
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Autor/in / Beteiligte Person: | Jiang, Binfan ; Xia, Dehong ; Zhang, Xinru |
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Zeitschrift: | Science of the Total Environment, Jg. 616/617 (2018-03-01), S. 1414-1422 |
Veröffentlichung: | 2018 |
Medientyp: | academicJournal |
ISSN: | 0048-9697 (print) |
DOI: | 10.1016/j.scitotenv.2017.10.174 |
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