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Differences of the oxidation process and secondary organic aerosol formation at low and high precursor concentrations
Chen, Tianzeng; Liu, Yongchun; Chu, Biwu; Liu, Changgeng; Liu, Jun; Ge, Yanli; Ma, Qingxin; Ma, Jinzhu; He, Hong
2019-05
Source PublicationJOURNAL OF ENVIRONMENTAL SCIENCES
ISSN1001-0742
Volume79Pages:256-263
AbstractCurrent atmospheric quality models usually underestimate the level of ambient secondary organic aerosol (SOA), one of the possible reasons is that the precursors at different concentrations may undergo different oxidation processes and further affect SOA formation. Therefore, there is a need to perform more chamber studies to disclose the influence. In this work, SOA formation over a wide range of initial precursor concentrations (tens of ppb to hundreds of ppb levels) was investigated in a 30m(3) indoor smog chamber, and mainly through the analysis of multiple generations of VOCs detected from HR-ToF-PTRMS to expound the difference in the oxidation process between low and high precursor concentrations. Compared to high initial concentrations, gas-phase intermediates formed at low concentrations had a higher intensity by about one order of magnitude, and the low-volatility compounds also had a higher formation potential due to the competition between semi-volatile intermediates and precursors with oxidants. In addition, the formed SOA was more oxidized with higher f(44 )value (0.14 +/- 0.02) and more relevant to real atmosphere than that formed at high concentrations. This work should help to deeply understand SOA formation and improve the performance of air quality models for SOA simulation. (C) 2018 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
Department水污染控制实验室
KeywordSecondary organic aerosol Aromatic hydrocarbons Aerosol mass spectrometer Low-volatility compounds Oxidation processes
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/43234
Collection水污染控制实验室
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100085, Peoples R China
2.Chinese Acad Sci, Inst Urban Environm, Ctr Excellence Reg Atmospher Environm, Xiamen 361021, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Beijing Univ Chem Technol, Beijing Adv Innovat Ctr Soft Matter Sci & Engn, Beijing 100029, Peoples R China
Recommended Citation
GB/T 7714
Chen, Tianzeng,Liu, Yongchun,Chu, Biwu,et al. Differences of the oxidation process and secondary organic aerosol formation at low and high precursor concentrations[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2019,79:256-263.
APA Chen, Tianzeng.,Liu, Yongchun.,Chu, Biwu.,Liu, Changgeng.,Liu, Jun.,...&He, Hong.(2019).Differences of the oxidation process and secondary organic aerosol formation at low and high precursor concentrations.JOURNAL OF ENVIRONMENTAL SCIENCES,79,256-263.
MLA Chen, Tianzeng,et al."Differences of the oxidation process and secondary organic aerosol formation at low and high precursor concentrations".JOURNAL OF ENVIRONMENTAL SCIENCES 79(2019):256-263.
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