Differentiated emissions and secondary organic aerosol formation potential of organic vapor from industrial coatings in China

Journal of Hazardous Materials, Год журнала: 2024, Номер 466, С. 133668 - 133668

Опубликована: Янв. 30, 2024

Язык: Английский

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Secondary Organic Aerosol Generated from Biomass Burning Emitted Phenolic Compounds: Oxidative Potential, Reactive Oxygen Species, and Cytotoxicity

Environmental Science & Technology, Год журнала: 2024, Номер 58(19), С. 8194 - 8206

Опубликована: Апрель 29, 2024

Phenolic compounds are largely emitted from biomass burning (BB) and have a significant potential to form SOA (Phc-SOA). However, the toxicological properties of Phc-SOA remain unclear. In this study, phenol guaiacol were chosen as two representative phenolic gases in BB plumes, water-soluble components their generated under different photochemical ages NOx levels investigated. contribute greatly oxidative (OP) biomass-burning SOA. OH-adducts (e.g., 2-methoxyhydroquinone) identified (GSOA) with high OP. The addition nitro groups 2,5-dimethyl-1,4-benzoquinone, surrogate quinone compound Phc-SOA, increased its toxicity both (PSOA) GSOA vitro human alveolar epithelial cells decreased aging terms cell death cellular reactive oxygen species (ROS), possibly due more ring-opening products relatively low toxicity. influence was consistent between ROS for but not PSOA, indicating that production does necessarily represent all processes contributing caused by PSOA. Combining acellular assays can provide comprehensive understanding aerosol properties.

Язык: Английский

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Secondary Brown Carbon Formation From Photooxidation of Furans From Biomass Burning

Geophysical Research Letters, Год журнала: 2024, Номер 51(1)

Опубликована: Янв. 4, 2024

Abstract Furans are a major class of volatile organic compounds emitted from biomass burning. Their high reactivity with atmospheric oxidants leads to the formation secondary aerosol (SOA), including brown carbon (BrC) that can affect global climate via interactions solar radiation. Here, we investigate optical properties and chemical composition SOA generated photooxidation furfural, 2‐methylfuran, 3‐methylfuran under dry (RH < 5%) humid ∼ 50%) conditions in presence nitrogen oxides (NO x ) ammonium sulfate seed aerosol. Dry furfural oxidation has greatest BrC formation, reduced nitrogen‐containing (NOCs) SOA, which dominated by amines amides formed reactions between carbonyls ammonia/ammonium. Based on products detected, propose novel pathways NOCs photooxidation, contribute accretion during photochemical aging burning plumes.

Язык: Английский

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Particle Size Distribution Dynamics Can Help Constrain the Phase State of Secondary Organic Aerosol

Environmental Science & Technology, Год журнала: 2021, Номер 55(3), С. 1466 - 1476

Опубликована: Янв. 8, 2021

Particle phase state is a property of atmospheric aerosols that has important implications for the formation, evolution, and gas/particle partitioning secondary organic aerosol (SOA). In this work, we use size-resolved chemistry microphysics model (Statistical Oxidation Model coupled to TwO Moment Aerosol Sectional (SOM-TOMAS)), updated include an explicit treatment particle state, constrain bulk diffusion coefficient (Db) SOA produced from α-pinene ozonolysis. By leveraging data laboratory experiments performed in absence seed under dry conditions, find Db can be constrained ((1–7) × 10–15 cm2 s–1 these experiments) by simultaneously reproducing time-varying mass concentrations evolution size distribution. Another version our used predicted composition calculate glass-transition temperature, viscosity, and, ultimately, (∼10–15 s–1) was able reproduce distribution measurements when included oligomer formation (oligomers accounted about fifth mass). Our work highlights potential using historical

Язык: Английский

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Process-Level Modeling Can Simultaneously Explain Secondary Organic Aerosol Evolution in Chambers and Flow Reactors

Environmental Science & Technology, Год журнала: 2022, Номер 56(10), С. 6262 - 6273

Опубликована: Май 3, 2022

Secondary organic aerosol (SOA) data gathered in environmental chambers (ECs) have been used extensively to develop parameters represent SOA formation and evolution. The EC-based are usually constrained less than one day of photochemical aging but extrapolated predict over much longer timescales atmospheric models. Recently, has increasingly studied oxidation flow reactors (OFRs) multiple days. However, these OFR rarely validate or update the parameters. simultaneous use EC is challenging because processes relevant evolution proceed very different timescales, both reactor types exhibit distinct experimental artifacts. In this work, we show that a kinetic chemistry microphysics model accounts for various processes, including wall losses, phase state, heterogeneous oxidation, oligomerization, new particle formation, can simultaneously explain experiments, using single consistent set With α-pinene as an example, first developed by fitting output measured mass concentration oxygen-to-carbon (O:C) ratio from experiment (<1 aging). We then simulate experiments found overestimated (by factor 3–16) ages ranging 0.4 13 days, when excluding abovementioned processes. By comprehensively accounting was able observed mass, composition (i.e., O:C), size distribution experiments. This work suggests be modeled consistently, synergistic aid developing more refined

Язык: Английский

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Aqueous-phase chemistry of atmospheric phenolic compounds: A critical review of laboratory studies

The Science of The Total Environment, Год журнала: 2022, Номер 856, С. 158895 - 158895

Опубликована: Сен. 18, 2022

Язык: Английский

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Oxidized and Unsaturated: Key Organic Aerosol Traits Associated with Cellular Reactive Oxygen Species Production in the Southeastern United States

Environmental Science & Technology, Год журнала: 2023, Номер 57(38), С. 14150 - 14161

Опубликована: Сен. 12, 2023

Exposure to ambient fine particulate matter (PM2.5) is associated with millions of premature deaths annually. Oxidative stress through overproduction reactive oxygen species (ROS) a possible mechanism for PM2.5-induced health effects. Organic aerosol (OA) dominant component PM2.5 worldwide, yet its role in toxicity poorly understood due chemical complexity. Here, integrated cellular ROS measurements and detailed multi-instrument characterization PM urban southeastern United States, we show that oxygenated OA (OOA), especially more-oxidized OOA, the main type production. We further reveal highly unsaturated containing carbon–oxygen double bonds aromatic rings OOA are major contributors These results highlight key features driving toxicity. As ubiquitous abundant atmosphere, this emphasizes need understand sources processing when formulating effective strategies mitigate impacts.

Язык: Английский

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Atmospheric clusters to nanoparticles: Recent progress and challenges in closing the gap in chemical composition

Journal of Aerosol Science, Год журнала: 2020, Номер 153, С. 105733 - 105733

Опубликована: Дек. 11, 2020

Язык: Английский

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Evaluation of Probes to Measure Oxidizing Organic Triplet Excited States in Aerosol Liquid Water

Environmental Science & Technology, Год журнала: 2023, Номер 57(15), С. 6052 - 6062

Опубликована: Апрель 3, 2023

Oxidizing triplet excited states of organic matter (3C*) drive numerous reactions in fog/cloud drops and aerosol liquid water (ALW). Quantifying oxidizing concentrations ALW is difficult because 3C* probe loss can be inhibited by the high levels dissolved (DOM) copper particle water, leading to an underestimate concentrations. In addition, illuminated contains singlet molecular oxygen (1O2*), which interfere with probes. Our overarching goal find a that has low inhibition DOM Cu(II) sensitivity 1O2*. To this end, we tested 12 potential probes from variety compound classes. Some are strongly DOM, while others react rapidly One candidates, (phenylthiol)acetic acid (PTA), seems well suited for conditions, mild fast rate constants triplets, but it also weaknesses, including pH-dependent reactivity. We evaluated performance both PTA syringol (SYR) as aqueous extracts particulate matter. While less sensitive than SYR, results lower concentrations, possibly reactive weakly triplets.

Язык: Английский

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New particle formation in the tropical free troposphere during CAMP²Ex: statistics and impact of emission sources, convective activity, and synoptic conditions

Atmospheric chemistry and physics, Год журнала: 2023, Номер 23(17), С. 9853 - 9871

Опубликована: Сен. 6, 2023

Abstract. Nucleation in the free troposphere (FT) and subsequent growth of new particles represent a globally important source cloud condensation nuclei (CCN). Whereas particle formation (NPF) has been shown to occur frequently upper over tropical oceans, there have few studies NPF at lower altitudes. In addition, impact urban emissions biomass burning on marine FT remains poorly understood. this study, we examine mid-troposphere (3–8.5 km) ocean coastal region using airborne measurements during recent Cloud, Aerosol Monsoon Processes Philippines Experiment (CAMP2Ex). was mostly observed above 5.5 km coincided with elevated relative humidity (RH) reduced sink (CS), suggesting that occurs convective outflow. The frequency increases altitude, reaching ∼ 50 % 8 km. An abrupt decrease coincides early monsoon transition is attributed increased CS resulting from activity more frequent transport aged plumes. Surprisingly, large fraction events background air were morning, likely made possible by very low despite actinic flux. Convectively detrained biomass-burning plumes fresh enhance as result precursor concentrations scavenging pre-existing particles. contrast, suppressed where reactive precursors are consumed, while relatively high. This study shows strong FT. results also illustrate competing influences different variables interactions among anthropogenic emissions, clouds, meteorology, which lead under variety conditions environments.

Язык: Английский

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