Aqueous processing of water-soluble organic compounds in the eastern United States during winter

El-Sayed, Marwa M.H.; Hennigan, Christopher J.

doi:10.1039/d2em00115b

Cited by 2 publications

(2 citation statements)

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“…However, recent studies have identified a subset of OC termed brown carbon (BrC) that is able to absorb strongly at visible wavelengths, typically <450 nm. − BrC and BrC precursor chemical components include aromatic and highly conjugated molecules, polycyclic aromatics, and nitro-compounds. , Nitrated phenolic compounds, such as nitrophenols, nitrocatechol, methylnitrophenol, methylnitrocatechol, and dinitrophenol, have been identified in BB events from different regions, including in cloud water samples from eastern China, , from winter time domestic wood burning in suburban region of London and from haze episodes in Shanghai . Furthermore, levoglucosan, anhydrosaccharides, and methoxyphenols, which are the pyrolysis products of cellulose, hemicellulose, and lignin, have been detected in wood smoke . According to the vegetation type, pyrolysis of lignin produces fine aerosols enriched in syringic acid, vanillic acid, and p -hydroxybenzoic acid. , …”

Section: Introductionmentioning

confidence: 99%

“…19 Furthermore, levoglucosan, anhydrosaccharides, and methoxyphenols, which are the pyrolysis products of cellulose, hemicellulose, and lignin, have been detected in wood smoke. 20 According to the vegetation type, pyrolysis of lignin produces fine aerosols enriched in syringic acid, vanillic acid, and p-hydroxybenzoic acid. 21 Based on laboratory and field studies on UV-induced aging of BB smoke, the high concentration of organic trace gases in the BB plume can lead to SOA formation 23 and enhance the organic aerosol mass.…”

Section: ■ Introductionmentioning

confidence: 99%

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Hygroscopicity and Volatility of Biomass Burning Aromatic and Nitroaromatic Compounds

Amugoda,

Singh,

Salas

et al. 2024

ACS EST Air

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The microphysical characteristics of aerosol particles from biomass burning (BB) impact their behavior in the atmosphere. Aromatic and nitroaromatic species, either directly emitted or formed by oxidation, are commonly found in BB. Despite generally low hygroscopicity, the oxygen functionality in these compounds can give rise to limited interactions with water vapor, influencing the optical properties and phase of BB particles. Here, we report on a range of aromatic and nitroaromatic compounds, revealing varied hygroscopic growth across molecules with similar functionality, demonstrating the importance of specific molecular interactions in predicting hygroscopic growth and solubility. We show that 4-nitrocatechol, phthalic acid, and 2-, 3-, and 4-nitrophenol exhibit reversible interactions with water, while vanillic acid, syringic acid, p-hydroxybenzoic acid, and nitrobenzaldehyde are nonhygroscopic. Most components measured did not exhibit measurable evaporation over 2−3 h at 293 K, indicating vapor pressures <10 −5 Pa. The structural isomers of nitrophenol showed significant volatility that varied with molecular structure, RH, and particle phase. We report liquid-state vapor pressures from evaporation measurements of aqueous particles at high RH and solid-state vapor pressures from measurements under dry conditions. Overall, our findings offer crucial physicochemical insights into how BB compounds interact with water vapor and their implications for aerosol behavior.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Hygroscopicity and Volatility of Biomass Burning Aromatic and Nitroaromatic Compounds

Amugoda,

Singh,

Salas

et al. 2024

ACS EST Air

View full text Add to dashboard Cite

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Chemical Differences between Phenolic Secondary Organic Aerosol Formed through Gas-Phase and Aqueous-Phase Reactions

Jiang,

Yu,

Yee

et al. 2024

ACS Earth Space Chem.

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Phenolic compounds, which are significant emissions from biomass burning (BB), undergo rapid photochemical reactions in both gas and aqueous phases to form secondary organic aerosol, namely, gasSOA and aqSOA, respectively. The formation of gasSOA and aqSOA involves different reaction mechanisms, leading to different product distributions. In this study, we investigate the gaseous and aqueous reactions of guaiacola representative BB phenolto elucidate the compositional differences between phenolic aqSOA and gasSOA. Aqueous-phase reactions of guaiacol produce higher SOA yields than gas-phase reactions (e.g., roughly 60 vs 30% at one half-life of guaiacol). These aqueous reactions involve more complex reaction mechanisms and exhibit a more gradual SOA evolution than their gaseous counterparts. Initially, gasSOA forms with high oxidation levels (O/C > 0.82), while aqSOA starts with lower O/C (0.55–0.75). However, prolonged aqueous-phase reactions substantially increase the oxidation state of aqSOA, making its bulk chemical composition closer to that of gasSOA. Additionally, aqueous reactions form a greater abundance of oligomers and high-molecular-weight compounds, alongside a more sustained production of carboxylic acids. AMS spectral signatures representative of phenolic gasSOA have been identified, which, together with tracer ions of aqSOA, can aid in the interpretation of field observation data on aerosol aging within BB smoke. The notable chemical differences between phenolic gasSOA and aqSOA highlighted in this study also underscore the importance of accurately representing both pathways in atmospheric models to better predict the aerosol properties and their environmental impacts.

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Aqueous processing of water-soluble organic compounds in the eastern United States during winter

Abstract: Aqueous multi-phase processes are significant contributors to organic aerosol (OA) mass in the atmosphere. This study characterizes the formation of water-soluble organic matter during the winter in the eastern United...

Cited by 2 publications

References 106 publications

Hygroscopicity and Volatility of Biomass Burning Aromatic and Nitroaromatic Compounds

Hygroscopicity and Volatility of Biomass Burning Aromatic and Nitroaromatic Compounds

Chemical Differences between Phenolic Secondary Organic Aerosol Formed through Gas-Phase and Aqueous-Phase Reactions

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