Investigation of α-Pinene + Ozone Secondary Organic Aerosol Formation at Low Total Aerosol Mass

Abstract. Secondary organic aerosol formation from the reaction of tertiary amines with nitrate radical was investigated in an indoor environmental chamber. Particle chemistry was monitored using a high resolution aerosol mass spectrometer while gas-phase species were detected using a proton transfer reaction mass spectrometer. Trimethylamine, triethylamine and tributylamine were studied. Results indicate that tributylamine forms the most aerosol mass followed by trimethylamine and triethylamine respectively. Spectra from the aerosol mass spectrometer indicate the formation of complex non-salt aerosol products. We propose a reaction mechanism that proceeds via abstraction of a proton by nitrate radical followed by RO2 chemistry. Rearrangement of the aminyl alkoxy radical through hydrogen shift leads to the formation of hydroxylated amides, which explain most of the higher mass ions in the mass spectra. These experiments show that oxidation of tertiary amines by nitrate radical may be an important night-time source of secondary organic aerosol.

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Secondary Organic Aerosol Formation from in-Use Motor Vehicle Emissions Using a Potential Aerosol Mass Reactor

Environmental Science & Technology ◽

10.1021/es502239v ◽

2014 ◽

Vol 48 (19) ◽

pp. 11235-11242 ◽

Cited By ~ 93

Author(s):

Daniel S. Tkacik ◽

Andrew T. Lambe ◽

Shantanu Jathar ◽

Xiang Li ◽

Albert A. Presto ◽

...

Keyword(s):

Vehicle Emissions ◽

Motor Vehicle ◽

Secondary Organic Aerosol ◽

Organic Aerosol ◽

Aerosol Formation ◽

Aerosol Mass ◽

Motor Vehicle Emissions ◽

Secondary Organic Aerosol Formation

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Secondary Organic Aerosol Yields from the Oxidation of Benzyl Alcohol

10.5194/acp-2020-492 ◽

2020 ◽

Author(s):

Sophia M. Charan ◽

Reina S. Buenconsejo ◽

John H. Seinfeld

Keyword(s):

Benzyl Alcohol ◽

Urban Areas ◽

Secondary Organic Aerosol ◽

Organic Aerosol ◽

Aerosol Formation ◽

Aerosol Mass ◽

Aerosol Exposure ◽

Chemical Products ◽

Secondary Organic Aerosol Formation ◽

Urban Conditions

Abstract. Recent inventory-based analysis suggests that emissions of volatile chemical products in urban areas are now competitive with those from the transportation sector. Understanding the potential for secondary organic aerosol formation from these volatile chemical products is, therefore, critical to predicting levels of aerosol and for formulating policy to reduce aerosol exposure. It is clear that a plethora of oxygenated compounds are either emitted directly into the atmosphere or emitted indoors and later escape into the outdoors. Experimental and computationally simulated environmental chamber data provide an understanding of aerosol yield and chemistry under relevant urban conditions (5–200 ppb NO and 291–312 K) and give insight into the effect of volatile chemical products on the production of secondary organic aerosol. Benzyl alcohol, one of these volatile chemical products, is found to have a large secondary organic aerosol formation potential. At NO concentrations of ~ 80 ppb and 291 K, secondary organic aerosol mass yields for benzyl alcohol can reach 1.

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Secondary organic aerosol yields from the oxidation of benzyl alcohol

Atmospheric Chemistry and Physics ◽

10.5194/acp-20-13167-2020 ◽

2020 ◽

Vol 20 (21) ◽

pp. 13167-13190

Author(s):

Sophia M. Charan ◽

Reina S. Buenconsejo ◽

John H. Seinfeld

Keyword(s):

Benzyl Alcohol ◽

Urban Areas ◽

Secondary Organic Aerosol ◽

Organic Aerosol ◽

Aerosol Formation ◽

Aerosol Mass ◽

Aerosol Exposure ◽

Chemical Products ◽

Secondary Organic Aerosol Formation ◽

Urban Conditions

Abstract. Recent inventory-based analysis suggests that emissions of volatile chemical products in urban areas are competitive with those from the transportation sector. Understanding the potential for secondary organic aerosol formation from these volatile chemical products is therefore critical to predicting levels of aerosol and for formulating policy to reduce aerosol exposure. Experimental and computationally simulated environmental chamber data provide an understanding of aerosol yield and chemistry under relevant urban conditions (5–200 ppb NO and 291–312 K) and give insight into the effect of volatile chemical products on the production of secondary organic aerosol. Benzyl alcohol, one of these volatile chemical products, is found to have a large secondary organic aerosol formation potential. At NO concentrations of ∼ 80 ppb and 291 K, secondary organic aerosol mass yields for benzyl alcohol can reach 1.

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Secondary organic aerosol formation from biomass burning emissions

10.5194/acp-2019-326 ◽

2019 ◽

Cited By ~ 2

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.

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