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Characterization of a Smog Chamber for Studying Formation and Physicochemical Properties of Secondary Organic Aerosol

Category: Aerosol and Atmospheric Chemistry

Volume: 16 | Issue: 12 | Pages: 3102-3113
DOI: 10.4209/aaqr.2015.10.0580
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Zaeem Bin Babar1, Jun-Hyun Park1,2, Jia Kang1, Ho-Jin Lim 1

  • 1 Department of Environmental Engineering, Kyungpook National University, Daegu 702-701, Korea
  • 2 Mass Spectrometry Research Center, Korea Basic Science Institute, Ochang 363-883, Korea

Highlights

A new indoor smog chamber with ~7 m3 FEP reactor at KNU is developed.

KNU smog chamber exhibits reliable temperature and relative humidity control.

NO2 photolysis and wall loss rates of gas and particle are in reasonable range.

This facility can be effectively used for SOA formation and chemistry.


Abstract

An indoor smog chamber facility has been built for carrying out secondary organic aerosol (SOA) formation and for studying physicochemical properties of SOA. This facility comprises of ~7 m3 FEP Teflon reactor placed in temperature controlled room coupled with instruments for gas and particle phase data. Detailed characterization experiments have been presented describing control of reactor temperature, relative humidity (RH), effective mixing time, wall loss rates of gases and particles, light source, and air purification. This chamber showed a wide range of temperature control with acceptable precision (i.e., 18–33 ± 0.5°C). The gas wall loss rates for NO, NO2, and O3 were found to be 3.78 × 10–4 min–1, 4.48 × 10–5 min–1, and 6.47 × 10–5 min–1, respectively. NO2 photolysis rate constant was 0.17 min–1. Particle wall loss constant was found to be 3.96 × 10–3 min–1 at Dp = 100 nm. SOA yields of dark α-pinene ozonolysis ranged from 0.025 to 0.378 for α-pinene concentrations from 10 ppb to 100 ppb.

Keywords

Smog chamber Secondary organic aerosol (SOA) α-pinene Ozonolysis


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