Construction and characterization of an atmospheric simulation smog chamber

Wu, Shengji; Lü, Zifeng; Hao, Jiming; Zhao, Zhe; Li, Junhua; Takekawa, Hideto; Minoura, Hiroaki; Yasuda, Akio

doi:10.1007/s00376-007-0250-3

Cited by 51 publications

(36 citation statements)

References 11 publications

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“…The experiments were carried out in a smog chamber which was described in detail in Wu et al (Wu et al, 2007). The 2 m 3 cuboid reactor, with a surface-to-volume ratio of 5 m -1 , was constructed with 50 μm-thick FEP-Teflon film (Toray Industries, Inc. Japan).…”

Section: Methodsmentioning

confidence: 99%

Effects of Inorganic Seeds on Secondary Organic Aerosol (SOA) Formation

Chu¹,

Jiang²,

Lü³

et al. 2012

Atmospheric Aerosols - Regional Characteristics - Chemistry and Physics

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Section: Methodsmentioning

confidence: 99%

Effects of Inorganic Seeds on Secondary Organic Aerosol (SOA) Formation

Chu¹,

Jiang²,

Lü³

et al. 2012

Atmospheric Aerosols - Regional Characteristics - Chemistry and Physics

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“…The floor is covered with less reflective but more durable stainless steel sheets. For indoor Teflon chambers, air conditioning systems are widely used to control the temperature within the tropospheric temperature range, which is roughly from −60 to 40 • C (Takekawa et al, 2003;Carter et al, 2005;Paulsen et al, 2005;Wu et al, 2007). The enclosure temperature of our chamber is controlled by three cooling units (total power 40 kW), which are located outside the laboratory next to the enclosure.…”

Section: Enclosurementioning

confidence: 99%

“…Wu et al (2007) constructed a 2 m 3 , precisely temperaturecontrolled indoor smog chamber made of FEP Teflon film to study the SOA formation. However, the small volumes of these smog chambers impart the disadvantage of relatively large wall effects and also make it difficult to do experiments of long durations.…”

Section: Introductionmentioning

confidence: 99%

Design and characterization of a smog chamber for studying gas-phase chemical mechanisms and aerosol formation

Wang

Liu²,

Bernard³

et al. 2014

Atmos. Meas. Tech.

103

100

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Abstract. We describe here characterization of a new stateof-the-art smog chamber facility for studying atmospheric gas-phase and aerosol chemistry. The chamber consists of a 30 m 3 fluorinated ethylene propylene (FEP) Teflon film reactor housed in a temperature-controlled enclosure equipped with black lamps as the light source. Temperature can be set in the range from −10 to 40 • C at accuracy of ±1 • C as measured by eight temperature sensors inside the enclosure and one just inside the reactor. Matrix air can be purified with non-methane hydrocarbons (NMHCs) < 0.5 ppb, NO x /O 3 /carbonyls < 1 ppb and particles < 1 cm −3 . The photolysis rate of NO 2 is adjustable between 0 and 0.49 min −1 . At 298 K under dry conditions, the average wall loss rates of NO, NO 2 and O 3 were measured to be 1.41 × 10 −4 min −1 , 1.39 × 10 −4 min −1 and 1.31 × 10 −4 min −1 , respectively, and the particle number wall loss rate was measured to be 0.17 h −1 . Auxiliary mechanisms of this chamber are determined and included in the Master Chemical Mechanism to evaluate and model propene-NO x -air irradiation experiments. The results indicate that this new smog chamber can provide high-quality data for mechanism evaluation. Results of α-pinene dark ozonolysis experiments revealed secondary organic aerosol (SOA) yields comparable to those from other chamber studies, and the two-product model gives a good fit for the yield data obtained in this work. Characterization experiments demonstrate that our Guangzhou Institute of Geochemistry, Chinese Academy Sciences (GIG-CAS), smog chamber facility can be used to provide valuable data for gas-phase chemistry and secondary aerosol formation.

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“…The chamber was described in detail in Wu et al [30]. A temperature-controlled enclosure (SEWT-Z-120, Escpec, Japan) provides a constant temperature between 10 and 30 °C (±0.5 °C), and 40 black lights (GE F40T12/BLB, peak intensity at 365 nm, General Electric Company, USA) provide irradiation during the experiments.…”

Section: 1mentioning

confidence: 99%

Secondary aerosol formation and oxidation capacity in photooxidation in the presence of Al2O3 seed particles and SO2

et al. 2015

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To investigate the sensitivity of secondary aerosol formation and oxidation capacity to NO x in homogeneous and heterogeneous reactions, a series of irradiated toluene/NO x /air and -pinene/NO x /air experiments were conducted in smog chambers in the absence or presence of Al 2 O 3 seed particles. Various concentrations of NO x and volatile organic compounds (VOCs) were designed to simulate secondary aerosol formation under different scenarios for NO x . Under "VOC-limited" conditions, the increasing NO x concentration suppressed secondary aerosol formation, while the increasing toluene concentration not only contributed to the increase in secondary aerosol formation, but also led to the elevated oxidation degree for the organic aerosol. Sulfate formation was suppressed with the increasing NO x due to a decreased oxidation capacity of the photooxidation system. Secondary organic aerosol (SOA) formation also decreased with the presence of high concentration of NO x , because organo-peroxy radicals (RO 2 ) react with NO x instead of with peroxy radicals (RO 2 or HO 2 ), resulting in the formation of volatile organic products. The increasing concentration of NO x enhanced the formation of sulfate, nitrate and SOA under "NO x -limited" conditions, in which the heterogeneous reactions played an important role. In the presence of Al 2 O 3 seed particles, a synergetic promoting effect of mineral dust and NO x on secondary aerosol formation in heterogeneous reactions was observed in the photooxidation. This synergetic effect strengthened the positive relationship between NO x and secondary aerosol formation under "NO x -limited" conditions but weakened or even overturned the negative relationship between NO x and secondary aerosol formation under "VOC-limited" conditions. Sensitivity of secondary aerosol formation to NO x seemed different in homogeneous and heterogeneous reactions, and should be both taken into account in the sensitivity study. The sensitivity of secondary aerosol formation to NO x was further investigated under "winter-like" and NH 3 -rich conditions. No obvious difference for the sensitivity of secondary aerosol formation except nitrate to NO x was observed. secondary aerosol, oxidation capacity, synergetic promoting effect, Al 2 O 3 seed particles, sensitivity

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Construction and characterization of an atmospheric simulation smog chamber

Cited by 51 publications

References 11 publications

Effects of Inorganic Seeds on Secondary Organic Aerosol (SOA) Formation

Effects of Inorganic Seeds on Secondary Organic Aerosol (SOA) Formation

Design and characterization of a smog chamber for studying gas-phase chemical mechanisms and aerosol formation

Secondary aerosol formation and oxidation capacity in photooxidation in the presence of Al2O3 seed particles and SO2

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