Characteristics, Origins, and Atmospheric Processes of Amines in Fine Aerosol Particles in Winter in China

Journal of Geophysical Research Atmospheres, Год журнала: 2023, Номер 128(14)

Опубликована: Июль 9, 2023

Abstract Amines affect particle formation, aerosol acidity, nitrogen cycle, and climate change. However, little is known about the temporal spatial differences in composition, source, formation process of amines fine particulate matter (PM 2.5 ) different regions China. Seven (amine salts) were investigated PM collected Yangtze River Delta (YRD, Shanghai Nanjing), Pearl (PRD, Guangzhou), northern China (Xi'an Haerbin), background (Puding) areas winter 2017–2018. Methylamine was dominant amine species at YRD, China, sites, while diethylamine dominated PRD site; moreover, mass concentration fraction lowest site. These results could be attributed to changes sources atmospheric processes. Further, coal combustion biomass burning found important contributors cities winter. The contribution weakened other urban sites. In contrast, abundance site largely controlled by biogenic sources. Acid‐base chemistry displacement mechanism tightly associated with salts all particular, degradation hydroxyl radical (•OH) significant Nanjing, Guangzhou, Xi'an, Haerbin insignificant photochemical sites can explained differentiated sources, meteorological conditions, •OH levels. Overall, our findings deepen understanding origins processes amines.

Язык: Английский

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Mapping atmospheric ammonia, alkylamines and their particulate partners in PM2.5 over the Northwest Pacific using an Ambient Ion Monitor – Ion Chromatograph (1) - residual origin, artifact reaction and signal extraction

Atmospheric Environment, Год журнала: 2025, Номер unknown, С. 121071 - 121071

Опубликована: Янв. 1, 2025

Язык: Английский

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Measurement report: Occurrence of aminiums in PM_2.5 during winter in China – aminium outbreak during polluted episodes and potential constraints

Atmospheric chemistry and physics, Год журнала: 2024, Номер 24(18), С. 10531 - 10542

Опубликована: Сен. 23, 2024

Abstract. Amines and aminiums play an important role in particle formation, liquid-phase reactions, climate change have attracted considerable attention over the years. Here, we investigated concentrations compositions of PM2.5 11 Chinese cities during winter, focusing on characteristics polluted days key factors influencing aminium outbreak. Monomethylaminium was dominant species most cities, except Taiyuan Guangzhou, followed by dimethylaminium. Diethylaminium dominated total Guangzhou. Thus, main amine sources Guangzhou were significantly different from those other cities. The (TAs) increased days, while relatively weak outbreaks occurred Xi'an Beijing. Additionally, TAs Beijing insignificantly correlated with major acidic aerosol components, opposite pattern observed nine acid–base chemistry associated formation all Based sensitivity analysis : ammonium ratio to changes, as well excluding effects relative humidity atmospheric oxidation, proposed possibility competitive uptake ammonia versus amines aerosols or displacement (constraining outbreaks). Overall, this study deepens understanding spatiotemporal differences characteristic China. However, particles form relevant require further mechanistic research.

Язык: Английский

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Two-Step Noncatalyzed Hydrolysis Mechanism of Imines at the Air–Water Interface

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(42), С. 28866 - 28873

Опубликована: Окт. 8, 2024

The hydrolysis of imines has long been assumed to be their main atmospheric fate, based on early studies in the field organic chemistry. However, mechanism and kinetics remain unclear. Here, an advanced Born-Oppenheimer molecular dynamics method was employed investigate noncatalyzed at air-water interface by selecting CH

Язык: Английский

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Seasonally Dependent Daytime and Nighttime Formation of Oxalic Acid Vapor and Particulate Oxalate in Tropical Coastal and Marine Atmospheres

Atmosphere, Год журнала: 2025, Номер 16(1), С. 98 - 98

Опубликована: Янв. 17, 2025

Oxalic acid is the most abundant low-molecular-weight dicarboxylic in atmosphere, and it plays a crucial role formation of new particles cloud condensation nuclei. However, observational studies have focused on particulate oxalate, leaving significant knowledge gap oxalic vapor. This study investigated concentrations vapor oxalate PM2.5 at rural tropical coastal island site south China across different seasons, based semi-continuous measurements using an Ambient Ion Monitor-Ion Chromatograph (AIM-IC) system. We replaced default 25 μL sampling loop AIM-IC with 250 loop, improving ability to distinguish signal from noise. The data revealed clear seasonal patterns dependent daytime nighttime vapor, benefiting high signal-to-noise ratios. Specifically, were 0.059 ± 0.15 μg m−3 February April 2023, exhibiting consistent diurnal variations similar those O3, likely driven by photochemical reactions. These values decreased 0.021 0.07 November December higher related dark chemistry processes, amplified accumulation due low mixing layer height. comparable but exhibited (3–7)-day variations, superimposed fluctuations varying degrees. Additionally, thermodynamic equilibrium calculations performed data, independent size distributions upwind marine atmosphere analyzed support findings.

Язык: Английский

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Amino Acid and Amine Compounds in Fine Aerosol Particles: A Review of Determination Methods, Abundances, Origins, and Atmospheric Processes

Aerosol Science and Engineering, Год журнала: 2025, Номер unknown

Опубликована: Март 6, 2025

Язык: Английский

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Does distance from the vehicle headlight change the properties of particulate matter?

Journal of Hazardous Materials, Год журнала: 2025, Номер unknown, С. 137999 - 137999

Опубликована: Март 1, 2025

Язык: Английский

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Particle Size Dependence and Phase Partitioning of Dimethylamine and Diethylamine in an Urban Atmosphere across Seasons

ACS Earth and Space Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Март 29, 2025

Язык: Английский

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An Adiabatic-Expansion-Induced Perturbation Study on Gas–Aerosol Partitioning in Ambient Air–Dimethylamine and Trimethylamine (1)

Atmosphere, Год журнала: 2025, Номер 16(5), С. 546 - 546

Опубликована: Май 5, 2025

Eulerian observations of chemical species at fixed positions in a flow field are known to violate conservation laws, while tracking moving air parcels practically unfeasible. often cause positive correlations between the reactants and products atmosphere, which frequently misinterpreted as evidence related conversion. This dilemma has motivated innovative trials. The perturbation technique, widely used mathematical physical studies, offers potential solution. Combining with techniques may compensate for this weakness, making approach particularly valuable studying gas–aerosol partitioning semi-volatile particulate ambient air. As an example, we examined combination through adiabatic-expansion-induced study dimethylamine (DMA) trimethylamine (TMA) size-segregated atmospheric particles ranging from 10 μm 0.056 μm, coupled downstream observations, were performed coastal marine atmospheres using commercial sampler (Nano-MOUDI-II, MSP, Shoreview, MN, USA), followed by offline analysis. results revealed that DMA generally tended evaporate during observational periods, enhanced perturbations occasionally led co-formation DMAHNO3 NH4NO3. However, gaseous TMA apparently underwent gas–particle condensation reach equilibrium air, resulting formation non-ionized particulates. thermodynamic analysis further supported observed was primarily determined rather than ionic TMAH+.

Язык: Английский

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Molecular Characterization of Nascent and Aged Sea Spray Aerosol

ACS Earth and Space Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Май 19, 2025

Язык: Английский

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