Ammonia effect on optical properties of secondary organic aerosols

被引：0
|
作者：
Wang J.-M. [1 ]
Zhao X.-Y. [2 ]
Chen L.-H. [2 ]
Han L.-X. [2 ]
Gao X. [2 ]
Cen K.-F. [2 ]
机构：
[1] Thermal Power Plant of Sinopec Qilu Branch, Zibo
[2] Institute for Thermal Power Engineering, Zhejiang University, Hangzhou
来源：
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | 2020年 / 54卷 / 09期
关键词：
Ammonia; Humidity; Refractive index; Secondary organic aerosols (SOA); Toluene;
D O I：
10.3785/j.issn.1008-973X.2020.09.018
中图分类号：
学科分类号：
摘要：
A series of toluene/NOx photo-oxidation experiments were carried out in a smog chamber, and the effect of ammonia on the optical properties of secondary organic aerosols (SOA) evolved by toluene was investigated. The chamber was made of Teflon. The distribution of SOA particle size, extinction efficiency, and mass spectrometric patterns were measured simultaneously during the experimental process. The variation of SOA parameters was discussed, including extinction section, refractive index, and particle size by changing ammonia volume fraction. Results show that the extinction of SOA was dominated by scattering. With the increase of particle size, the extinction cross section exponentially increases, the refractive index firstly increases and then decreases. Compared with low humidity ammonia free environment, the increase of molar ratios of O to C and refractive index of SOA was found either increasing humidity or with ammonia. Under high humidity with ammonia, there is obvious decrease of particle size, sharp increase of number density of particles, and increase both molar ratios of O to C and N to C. Copyright ©2020 Journal of Zhejiang University (Engineering Science). All rights reserved.
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页码：1812 / 1818
页数：6
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