Photoreaction of biomass burning brown carbon aerosol particles

Liu-Kang, Carolyn; Gallimore, Peter J.; Liu, Tengyu; Abbatt, Jonathan P. D.

doi:10.1039/d1ea00088h

Cited by 6 publications

(9 citation statements)

References 54 publications

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“…Biomass burning (BB), for example, domestic solid fuel burning, emits a large amount of organic nitrogen (N)-containing organic compounds into the air in urban environments. − One fraction of the N-containing organics is associated with the so-called “brown carbon” (BrC) compounds that absorb in the visible range of the solar spectrum, thereby contributing to positive radiative forcing (warming the atmosphere). − (Photo)chemical oxidation of phenolic substances occurring in the atmospheric aqueous phase (cloud, fog, and aerosol liquid water) − and heterogeneous processing of gas-phase ozone (O 3 ) with the methoxyphenols at the water surface can also contribute to the formation of N-containing organic compounds, including BrC, in the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Ozone Oxidation Chemistry at a Riverine Surface Microlayer as a Source of Nitrogen Organic Compounds

Wang

Deng

et al. 2022

Environ. Sci. Technol. Lett.

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Nitrogen (N)-containing organic compounds, including “brown carbon” (BrC), represent an important fraction of organic aerosols. However, little is known about the processes of formation of the secondarily formed N-containing organics in the atmosphere. Here, we investigated the formation of gas-phase organic compounds, including N-containing organics, through interfacial oxidation chemistry of gaseous O3 with an authentic riverine surface microlayer (SML) by using a high-resolution quadrupole Orbitrap mass spectrometer coupled to a commercial secondary electrospray ionization source. The resulting hierarchical cluster diagram obtained for real-time observation for 60 min shows the occurrence of 677 ions in positive mode. The level of N-containing organics, including BrC compounds (e.g., imidazoles), formed during the heterogeneous processing of O3 on the SML in the dark and under ultraviolet–visible light irradiation, was on average 20.7% among all samples. Many of the detected N-containing compounds comprise a CN bond, suggesting that they are potentially toxic compounds that also affect urban air quality. Overall, this study provides evidence that interfacial ozone oxidation chemistry at the riverine SML plays an important role as an additional source of air pollution in urban environments, which can affect both human health and the absorption properties of urban aerosols.

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Section: Introductionmentioning

confidence: 99%

Interfacial Ozone Oxidation Chemistry at a Riverine Surface Microlayer as a Source of Nitrogen Organic Compounds

Wang

Deng

et al. 2022

Environ. Sci. Technol. Lett.

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“…Experimental biomass burning aerosol particles were generated based on a previous approach. ,, In particular, pine wood and peat pellets (both from commercial suppliers) were smoldered to mimic real-life smoldering conditions for biomass burning. Blocks of pine (4 g) were cut to approximately 8 cm × 2 cm × 1 cm.…”

Section: Experimental and Data Analysis Methodsmentioning

confidence: 99%

Nitration of Phenols by Reaction with Aqueous Nitrite: A Pathway for the Formation of Atmospheric Brown Carbon

Wang

Jorga

Abbatt

2023

ACS Earth Space Chem.

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Nitrophenols are a major component of light-absorbing atmospheric organic aerosols, commonly referred to as brown carbon (BrC). Most nitrophenol formation pathways involve reactions of phenolic compounds with OH, NO3, and NO2 in the gas phase. In this study, an aqueous nitrophenol production pathway is investigated that can proceed in the dark without apparent OH radical formation. Using high-performance liquid chromatography–mass spectrometry, we demonstrate that catechol reacts in acidic solutions with dissolved nitrite to form nitrocatechol. The rate of nitration increases significantly from pH 4.4 to pH 3.4 such that nitrocatechol is susceptible to second-generation reactions under the most acidic conditions producing chromophores that absorb in the visible region (peak at 425 nm). Increases in the N:C ratio of the reaction solution, as detected by aerosol mass spectrometry, and enhanced absorption from 300 to 500 nm of wood and peat smoke aqueous extracts exposed to nitrite suggest that this is a general nitration pathway. The atmospheric conditions under which this BrC formation process may occur are discussed.

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“…There are carbonyl-containing compounds in BBOA with a range of volatilities, including sinapaldehyde and coniferaldehyde, , which are expected to be similarly susceptible. Irradiation at UV wavelengths can also change the optical properties of BrC constituents of BBOA, as has been shown for isolated compounds like 2,4-dinitrophenol as well as complex mixtures of compounds from biomass burning in the laboratory. , This irradiation has been shown to cause both darkening and whitening, , potentially depending on the fuel species, wavelength range, exposure time, and spectral flux. Recently, the first evidence that irradiation at UV wavelengths can also change the viscosity of organic aerosol was reported: secondary organic aerosol generated from the ozonolysis of d -limonene and α-pinene became more viscous, by orders of magnitude, after atmospherically relevant amounts of UV irradiation .…”

Section: Introductionmentioning

confidence: 95%

“…Irradiation at UV wavelengths can also change the optical properties of BrC constituents of BBOA, as has been shown for isolated compounds like 2,4-dinitrophenol as well as complex mixtures of compounds from biomass burning in the laboratory. 6,23 This irradiation has been shown to cause both darkening and whitening, 24,25 organic aerosol was reported: secondary organic aerosol generated from the ozonolysis of D-limonene and α-pinene became more viscous, by orders of magnitude, after atmospherically relevant amounts of UV irradiation. 26 If a similar increase in viscosity were to occur for BBOA, it would have significant implications for the multiphase processing of primary BrC in the atmosphere, since increased viscosity would slow the mixing of oxidants and organics within the particles.…”

Section: ■ Introductionmentioning

confidence: 99%

Ultraviolet Irradiation Can Increase the Light Absorption and Viscosity of Primary Brown Carbon from Biomass Burning

Al-Mashala,

Betz,

Calvert

et al. 2023

ACS Earth Space Chem.

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The light absorption of brown carbon (BrC) constituents of biomass burning organic aerosol (BBOA) changes in the atmosphere, in part due to multiphase oxidation. For example, ozonolysis leads to the whitening of primary BrC constituents. Irradiation can also change the properties of BrC. Here, we investigate the interplay between irradiation and multiphase processing by measuring the reactive uptake of ozone to thin films of BBOA before and after exposure to UV radiation in a photoreactor. Thin films were prepared from the lower volatility fraction of BBOA from eastern red cedar, a species associated with wildfires and prescribed fires in the southern Great Plains, United States. Irradiation increased the mass absorption coefficient of the BrC at near-UV and visible wavelengths. It also significantly decreased the reactive uptake of ozone, which was attributed to increased viscosity of the BBOA material. These changes in absorptivity and viscosity are consistent with results of mass spectrometry and volatility tandem differential mobility analysis, which show that high-molecular-weight species constitute a greater fraction of the total mass after irradiation. Our results may have significant implications on the warming effect of BrC, since UV irradiation here both darkens this BBOA material and makes it more resistant to multiphase processing and whitening by ozone under the conditions investigated.

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Photoreaction of biomass burning brown carbon aerosol particles

Abstract: The light-absorbing fraction of atmospheric organic particles, known as brown carbon (BrC) aerosol, can affect climate by influencing global radiative forcing. Regional effects arising from biomass burning BrC pollution are...

Cited by 6 publications

References 54 publications

Interfacial Ozone Oxidation Chemistry at a Riverine Surface Microlayer as a Source of Nitrogen Organic Compounds

Interfacial Ozone Oxidation Chemistry at a Riverine Surface Microlayer as a Source of Nitrogen Organic Compounds

Nitration of Phenols by Reaction with Aqueous Nitrite: A Pathway for the Formation of Atmospheric Brown Carbon

Ultraviolet Irradiation Can Increase the Light Absorption and Viscosity of Primary Brown Carbon from Biomass Burning

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