Multigeneration Production of Secondary Organic Aerosol from Toluene Photooxidation

2021 ◽  
Author(s):  
Yixin Li ◽  
Jiayun Zhao ◽  
Yuan Wang ◽  
John H. Seinfeld ◽  
Renyi Zhang
Keyword(s):  
Secondary Organic Aerosol ◽  
Organic Aerosol ◽  
Toluene Photooxidation

scholarly journals Effect of Humidity on the Reactive Uptake of Ammonia and Dimethylamine by Nitrogen-Containing Secondary Organic Aerosol

Atmosphere ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1502
Author(s):  
Natalie R. Smith ◽  
Julia Montoya-Aguilera ◽  
Donald Dabdub ◽  
Sergey A. Nizkorodov
Keyword(s):  
Relative Humidity ◽  
Secondary Organic Aerosol ◽  
Condensation Reaction ◽  
Organic Aerosol ◽  
Uptake Coefficient ◽  
Acid Base Equilibrium ◽  
Amine Uptake ◽  
Reactive Uptake Coefficient ◽  
Uptake Coefficients ◽  
Toluene Photooxidation

This study investigated the uptake of ammonia (NH3) by secondary organic aerosol (SOA) particles generated via limonene photooxidation or ozonolysis as well as the uptake of dimethylamine (DMA) by limonene ozonolysis, α-cedrene photooxidation, or toluene photooxidation SOA in an environmental chamber between 0–50% relative humidity. In addition to the acid-base equilibrium uptake, NH3 and DMA can react with SOA carbonyl compounds converting them into nitrogen-containing organic compounds (NOCs). The effective reactive uptake coefficients for the formation of NOCs from ammonia were measured on the order of 10−5. The observed DMA reactive uptake coefficients ranged from 10−5 to 10−4. Typically, the reactive uptake coefficient decreased with increasing relative humidity. This is consistent with NOC formation by a condensation reaction between NH3 or DMA with SOA, which produces water as a product. Ammonia is more abundant in the atmosphere than amines. However, the larger observed reactive uptake coefficient suggests that amine uptake may also be a potential source of organic nitrogen in particulate matter.

Effect of NOx and RH on the secondary organic aerosol formation from toluene photooxidation

2022 ◽  
Author(s):  
Shijie Liu ◽  
Xiaodi Liu ◽  
Yiqian Wang ◽  
Si Zhang ◽  
Can Wu ◽  
...  
Keyword(s):  
Secondary Organic Aerosol ◽  
Organic Aerosol ◽  
Aerosol Formation ◽  
Secondary Organic Aerosol Formation ◽  
Toluene Photooxidation

scholarly journals Secondary organic aerosol formation from toluene photooxidation under various NO<sub>x</sub> conditions and particle acidity

2008 ◽  
Vol 8 (4) ◽  
pp. 14467-14495 ◽  
Author(s):  
G. Cao ◽  
M. Jang
Keyword(s):  
Secondary Organic Aerosol ◽  
Organic Aerosol ◽  
Aerosol Formation ◽  
Organic Mass ◽  
Humidity Effect ◽  
Toluene Concentration ◽  
Acidic Sulfate ◽  
Secondary Organic Aerosol Formation ◽  
Toluene Photooxidation ◽  
Teflon Film

Abstract. Secondary organic aerosol (SOA) formation from photooxidation of toluene is studied using a 2 m3 indoor Teflon film chamber under three different NOx conditions: low (≤3 ppb), intermediate (90–105 ppb) and high (280–315 ppb). SOA experiments are conducted in the presence of either neutral or acidic sulfate seed aerosols under two different humidity levels (%RH 15–22 or 38–49). NOx concentrations in the chamber air affect not only SOA yields but also SOA growth described by the organic mass (OM) produced as a function of the toluene concentration consumed over the course of a single SOA experiment. The particle acidity effect on toluene SOA formation varies with NOx concentrations. For the low and the intermediate NOx experiments, SOA yields with acidic sulfate seed considerably increase by: 36%–115% at low %RH and 25–44% at high %RH compared to those with neutral seed. No significant particle acidity effect is observed for the high NOx experiments. The humidity effect on SOA formation is also different at the three NOx levels. For the low NOx experiments, SOA yields are 29%–34% lower at high %RH than those at low %RH in the presence of either neutral or acidic sulfate seed. For the intermediate NOx experiments, SOA yields at high %RH increase by 39% in the presence of neutral seed but slightly decrease by 7% in the presence of acidic sulfate seed compared to those at low %RH. For the high NOx experiments with a high NO fraction, no significant humidity effect on SOA yields is found with both neutral and acidic sulfate seeds.

scholarly journals Secondary organic aerosol formation from biomass burning emissions

2019 ◽  
Author(s):  
Christopher Y. Lim ◽  
David H. Hagan ◽  
Matthew M. Coggon ◽  
Abigail R. Koss ◽  
Kanako Sekimoto ◽  
...  
Keyword(s):  
Biomass Burning ◽  
Secondary Organic Aerosol ◽  
Total Concentration ◽  
Organic Aerosol ◽  
Oh Radicals ◽  
Aerosol Formation ◽  
Atmospheric Aging ◽  
Aerosol Mass ◽  
Photochemical Aging ◽  
Organic Gases

Abstract. Biomass burning is an important source of aerosol and trace gases to the atmosphere, but how these emissions change chemically during their lifetimes is not fully understood. As part of the Fire Influence on Regional and Global Environments Experiment (FIREX 2016), we investigated the effect of photochemical aging on biomass burning organic aerosol (BBOA), with a focus on fuels from the western United States. Emissions were sampled into a small (150 L) environmental chamber and photochemically aged via the addition of ozone and irradiation by 254 nm light. While some fraction of species undergoes photolysis, the vast majority of aging occurs via reaction with OH radicals, with total OH exposures corresponding to the equivalent of up to 10 days of atmospheric oxidation. For all fuels burned, large and rapid changes are seen in the ensemble chemical composition of BBOA, as measured by an aerosol mass spectrometer (AMS). Secondary organic aerosol (SOA) formation is seen for all aging experiments and continues to grow with increasing OH exposure, but the magnitude of the SOA formation is highly variable between experiments. This variability can be explained well by a combination of experiment-to-experiment differences in OH exposure and the total concentration of non-methane organic gases (NMOGs) in the chamber before oxidation, measured by PTR-ToF-MS (r2 values from 0.64 to 0.83). From this relationship, we calculate the fraction of carbon from biomass burning NMOGs that is converted to SOA as a function of equivalent atmospheric aging time, with carbon yields ranging from 24 ± 4 % after 6 hours to 56 ± 9 % after 4 days.

scholarly journals Aging of atmospheric aerosols and the role of iron in catalyzing brown carbon formation

2021 ◽  
Author(s):  
Hind A. A. Al-Abadleh
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Atmospheric Aerosols ◽  
Secondary Organic Aerosol ◽  
Organic Aerosol ◽  
Atmospheric Oxidation ◽  
Carbon Formation ◽  
Brown Carbon ◽  
Volatile Organic

Extensive research has been done on the processes that lead to the formation of secondary organic aerosol (SOA) including atmospheric oxidation of volatile organic compounds (VOCs) from biogenic and anthropogenic...

PRELIMINARY RESULTS OF THE OSOA PROJECT (ORIGIN AND FORMATION OF SECONDARY ORGANIC AEROSOL)

2001 ◽  
Vol 32 ◽  
pp. 903-904
Author(s):  
T. HOFFMANN ◽  
B. SCHELL ◽  
J. HJORTH ◽  
I. BARNES ◽  
G. MOORTGAT ◽  
...  
Keyword(s):  
Secondary Organic Aerosol ◽  
Organic Aerosol ◽  
Preliminary Results
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