| Title: | A multicomponent kinetic model established for investigation on atmospheric new particle formation mechanism in H(2)SO(4)-HNO(3)-NH(3)-VOC system |
| Address: | "School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China. School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry, University of Science and Technology Beijing, Beijing 100083, China. Electronic address: xia@me.ustb.edu.cn" |
| DOI: | 10.1016/j.scitotenv.2017.10.174 |
| ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Linking) |
| Abstract: | "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 3nm 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" |
| Keywords: | Kinetic model Modeling analysis New particle formation PM2.5 mitigations; |
| Notes: | "PubMed-not-MEDLINEJiang, Binfan Xia, Dehong Zhang, Xinru eng Netherlands 2017/10/27 Sci Total Environ. 2018 Mar; 616-617:1414-1422. doi: 10.1016/j.scitotenv.2017.10.174. Epub 2017 Oct 21" |
