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Effect of aluminium dust on secondary organic aerosol formation in m-xylene/NOx photo-oxidation

Authors
  • Liu, Chang1
  • Ma, QingXin2
  • Chu, BiWu2
  • Liu, YongChun2
  • He, Hong2
  • Zhang, XiaoYe1
  • Li, JunHua3
  • Hao, JiMing3
  • 1 Chinese Academy of Meteorological Sciences, Beijing, 100081, China , Beijing (China)
  • 2 Chinese Academy of Sciences, Research Center for Eco-Environmental Sciences, Beijing, 100085, China , Beijing (China)
  • 3 Tsinghua University, School of Environment, Beijing, 100084, China , Beijing (China)
Type
Published Article
Journal
Science China Earth Sciences
Publisher
Science China Press
Publication Date
Dec 20, 2014
Volume
58
Issue
2
Pages
245–254
Identifiers
DOI: 10.1007/s11430-014-5023-0
Source
Springer Nature
Keywords
License
Yellow

Abstract

As an important anthropogenic volatile organic compound (VOC), m-xylene has attracted numerous attentions due to its potential in secondary organic aerosol (SOA) formation. In this study, effects of aluminium dust seeds (boehmite and alumina) on SOA yield and aerosol size in m-xylene/NOx photo-oxidation were investigated in a 2 m3 smog chamber at 30°C and 50% relative humidity. Compared to the seed-free system, the presence of aluminium seeds resulted in an increase in the SOA yield, and also enhanced the O3 concentration in the chamber. The photolysis of O3 is a major source of OH radical, which is the most important oxidant of m-xylene. The increase in O3 concentration could result in the generation of more OH radicals, and finally contribute to the SOA formation. Seed particles influence the SOA size mainly by acting as condensation nuclei. Semi-volatile organic compounds (SVOCs) were condensed onto these nuclei, resulting in the increase in SOA size. However, when aluminium seeds with high concentrations were introduced into the system, SVOCs that had been condensed onto each particle were dispersed by these seeds, leading to the reduction in aerosol size.

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