Characterization of a smog chamber for studying formation of gas-phase products and secondary organic aerosol
Publication in refereed journal

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摘要Smog chambers provide a potent approach to explore the secondary organic aerosol formation under varied conditions. This study describes the construction and characterization of a new smog chamber facility for studying the formation mechanisms of gas-phase products and secondary organic aerosol from the photooxidation of volatile organic compounds. The chamber is a 5.4 m3 Fluorinated Ethylene Propylene (FEP) Teflon reactor with the potential to perform photooxidation experiments at controlled temperature and relative humidity. Detailed characterizations were conducted for evaluation of stability of environmental parameters, mixing time, background contamination, light intensity, and wall losses of gases and particles. The photolysis rate of NO2 (JNO2) ranged from (1.02−3.32) ×10−3 s−1, comparable to the average JNO2 in ambient environment. The wall loss rates for NO, NO2, and O3 were 0.47 × 10−4, 0.37 × 10−4, and 1.17 × 10−4 min−1, while wall loss of toluene was obsoletely found in a 6 hr test. The particle number wall loss rates are (0.01−2.46) ×10−3 min−1 for 40−350 nm with an average lifetime of more than one day. A series of toluene photooxidation experiments were carried out in absence of NOx under dry conditions. The results of the simulation experiments demonstrated that the chamber is well designed to simulate photolysis progress in the atmosphere.
出版社接受日期21.12.2022
著者Yuan Q., Zhang Z. Z., Wang M., Ho K. F., Wang T., Lee S. C.
期刊名稱Journal of Environmental Sciences
出版年份2024
月份2
卷號136
出版社Elsevier
頁次570 - 582
國際標準期刊號1001-0742
電子國際標準期刊號1878-7320
語言美式英語

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