Investigation into the differences and relationships between gasSOA and aqSOA in winter haze pollution on Chongming Island, Shanghai, based on VOCs observation

Environmental Pollution, Год журнала: 2022, Номер 316, С. 120684 - 120684

Опубликована: Ноя. 16, 2022

Язык: Английский

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Urgency of controlling agricultural nitrogen sources to alleviate summertime air pollution in the North China Plain

Chemosphere, Год журнала: 2022, Номер 311, С. 137124 - 137124

Опубликована: Ноя. 6, 2022

Язык: Английский

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Weakened Gas-to-Particle Partitioning of Oxygenated Organic Molecules in Liquified Aerosol Particles

Environmental Science & Technology Letters, Год журнала: 2022, Номер 9(10), С. 837 - 843

Опубликована: Сен. 21, 2022

Aqueous-phase chemistry plays an important role in secondary organic aerosol (SOA) formation. However, the mechanism of interaction between physics and is still poorly understood. Here continuous measurements gas- particle-phase composition organics were conducted using iodine-adduct time-of-flight chemical ionization mass spectrometer coupled with a filter inlet for gases aerosols Beijing to understand physicochemical processes related SOA Our results showed that contributed 65.9% OA 17.1% nonrefractory PM2.5 during whole campaign. These values are lower than those reported previous studies. oligomerization from methylglyoxal (C3H4O2) oligomers (C4–7H6–10O5) probable path direct gas-to-particle partitioning some CxHyOz particle-gas partition coefficient ≳1.0 × 10–5 weakened when water content (AWC) exceeds 15 μg m–3, corresponding relative glass transition temperature below 0.85 compared AWC <15 m–3. A phase solid/semisolid liquid, increasing diffusivity particles, should explain observed inhibition and, subsequently, low fraction at high humidity pollution events. This study provides new insights into formation mechanism.

Язык: Английский

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An overlooked oxidation mechanism of toluene: computational predictions and experimental validations

Chemical Science, Год журнала: 2023, Номер 14(45), С. 13050 - 13059

Опубликована: Янв. 1, 2023

Secondary organic aerosols (SOAs) influence the Earth's climate and threaten human health. Aromatic hydrocarbons (AHs) are major precursors for SOA formation in urban atmosphere. However, revealed oxidation mechanism dramatically underestimates contribution of AHs to formation, strongly suggesting importance seeking additional pathways formation. Using toluene, most abundant AHs, as a model system combination quantum chemical method field observations based on advanced mass spectrometry, we herein demonstrate that second-generation can form novel epoxides (TEPOX) with high yield. Such TEPOX further react H2SO4 or HNO3 aerosol phase less-volatile compounds including non-aromatic ring-retaining organosulfates organonitrates through reactive uptakes, providing new candidates AH-derived future ambient observation. With newly mechanism, chemistry-aerosol box modeling yield toluene reach up 0.35, much higher than 0.088 original under conditions pH = 2 0.1 ppbv NO. This study opens route uptake from significantly fills current knowledge gap

Язык: Английский

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Modelling molecular composition of SOA from toluene photo-oxidation at urban and street scales

Environmental Science Atmospheres, Год журнала: 2024, Номер 4(8), С. 839 - 847

Опубликована: Янв. 1, 2024

Near-explicit chemical mechanisms representing toluene SOA formation are reduced using the GENOA algorithm and used in 3D simulations of air quality over Greater Paris streets a district near Paris.

Язык: Английский

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