Surfaces and Interfaces, Год журнала: 2024, Номер 55, С. 105493 - 105493
Опубликована: Ноя. 25, 2024
Язык: Английский
Current Pollution Reports, Год журнала: 2025, Номер 11(1)
Опубликована: Июнь 3, 2025
Язык: Английский
Процитировано
0
Analytical Sciences, Год журнала: 2024, Номер 40(10), С. 1907 - 1918
Опубликована: Июль 5, 2024
Sampling and chromatography-mass spectrometry methods were investigated to measure atmospheric amines aminoamides. Amines their amide derivatives play significant roles in new particle formation (NPF) the atmosphere, especially diamines aminoamides have higher NPF potentials compared monoamines. For amine sampling, silica gel tube collection formic acid extraction gave good overall recoveries (>93 ± 8%) for mono-, di-, tri-, tetramines, Two chromatography subjected analyze extracted amines. One involved direct analysis using hydrophilic interaction liquid with carboxyl or diol group functioned separation column (carboxyl-HILIC diol-HILIC), other utilized derivatization 4-(N,N-dimethylaminosulfonyl)-7-fluoro-2,1,3-benzoxadiazole (DBD-F) subsequent reversed-phase (HPLC). Separated detected by electrospray ionization tandem mass both cases. DBD-F-HPLC method provided sensitivity mono- all polyamines (limit of detection (LOD) < 4.6 nM, relative standard deviation (RSD) 100 nM 9.2%). However, could not be DBD-F-HPLC. Carboxyl-HILIC sensitivities (LOD 1.6 RSD 4.8%). Forest air measurement was performed data obtained carboxyl-HILIC showed agreement 1,3-diaminopropane, 1,4-diaminobutane (putrescine) 1,5-diaminopentane (cadaverine) (R
Язык: Английский
Процитировано
2
Environmental Science & Technology Letters, Год журнала: 2024, Номер unknown
Опубликована: Ноя. 28, 2024
Aminiums are significant components of organic aerosols with intense research on aliphatic aminiums. However, the mechanisms formation aromatic aminiums in urban remain elusive. Highly time-resolved PM2.5 samples were collected center Shanghai (China) during winter to investigate origin and The dominant aminium groups (mainly dimethylaminium monomethylaminium). Anilinium was third most abundant aminium. concentrations anilinium total showed higher levels daytime weekdays. This finding combined source apportionment analysis suggested that daily weekly scale variations anthropogenic activities (e.g., traffic for commuting) mainly responsible fluctuations (particularly aminiums). acid dependence significantly stronger than formation. Aliphatic negatively positively correlated ozone, respectively, suggesting oxidative processes weakened abundance but promoted molecular characterization atmospheric degradation higher-molecular-weight amine compounds an important mechanism aerosols. Thus, this study provides novel insights into
Язык: Английский
Процитировано
2
Journal of Environmental Management, Год журнала: 2023, Номер 347, С. 119079 - 119079
Опубликована: Сен. 23, 2023
Язык: Английский
Процитировано
4
ChemistrySelect, Год журнала: 2024, Номер 9(3)
Опубликована: Янв. 16, 2024
Abstract N ‐alkyl anilines are a series of common and versatile compounds which not only have been used as reaction solvents, acid‐accepters, organic‐bases, but also in synthesis dyes, pharmaceuticals, anti‐colodal. The ‐methyl and/or , ‐dimethyl the most representative ones among these. Due to their widespread uses, numerous works reported on synthetic strategies past decades. studies N−H methylations mainly focus selection reagents, catalysts, or ligands design. Different transition‐metals, e. g., Ir, Ru, Pd, et. al, with different methylation protocols. Methanol (CH 3 OH), carbon dioxide (CO 2 ), formaldehyde (HCHO), dimethyl carbonate ((CH ) CO was C source, hydrogen (H silanes H source. In this work, we would like summarize latest advances ( included) derivatives. This review provides an overview reactants catalyst, well emphasis scope substrates proposed mechanism for each work.
Язык: Английский
Процитировано
1
Environmental Science & Technology, Год журнала: 2024, Номер 58(12), С. 5453 - 5460
Опубликована: Март 13, 2024
Many types of living plants release gaseous trimethylamine (TMA), making it a potentially important contributor to new particle formation (NPF) in remote areas. However, panoramic view the importance forest biogenic TMA at regional scale is lacking. Here, we pioneered nationwide mobile measurements across transect contiguous farmland eastern China and subtropical forests southern China. In contrast route, concentrations measured during route correlated significantly with isoprene, suggesting potential emissions from leaves. Our high time-resolved obtained weak photo-oxidizing atmosphere reflected freshly emitted TMA, indicating highest emission intensity irrigated dryland (set as baseline 10), followed by paddy field (7.1), evergreen (5.9), broadleaf mixed (4.3). Extrapolating their proportions roughly China, alone, which constitute half total area, account for nearly 70% nation's farmland. estimates, despite uncertainties, take first step toward large-scale assessment amines, highlighting need observational modeling studies consider this hitherto overlooked source TMA.
Язык: Английский
Процитировано
1
Aerosol Science and Technology, Год журнала: 2024, Номер 58(4), С. 440 - 460
Опубликована: Апрель 2, 2024
The protonation state of organic acids and bases in aqueous aerosols has the potential to impact cloud activating properties by altering H+ concentrations, consequently aerosol chemistry water activity, but is currently overlooked most atmospheric models. We investigated acid–base dissociation on droplet number concentration short-wave radiative effect from formation environments with varying incorporating into aerosol–chemistry–climate box model ECHAM6.3–HAM2.3. degree previously been observed for several organics Brönsted acid or base character be significantly modified surface, compared bulk solution. introduced an empirical account this mechanism both explore further climate effects. Suwanee River Fulvic decanoic were used as examples acidic tributylamine n-butylamine bases. Our results show that accounting equilibria components, their possible surface modulation, enhanced a substantial clouds, pristine, clean, well polluted environments. leads concentrations aerosol, which influences sulfur drastically increase sulfate mass whole population. increased contributes rise particles within larger size ranges, thereby increasing concentrations. In addition, amounts ions resulting amount available solute leading higher condensation nuclei, droplets. smaller than all modulation largest clean These emphasize importance aerosol-cloud-climate consideration models regional global scales.
Язык: Английский
Процитировано
1
Atmospheric Research, Год журнала: 2024, Номер 309, С. 107586 - 107586
Опубликована: Июль 14, 2024
Язык: Английский
Процитировано
1
Journal of Aerosol Science, Год журнала: 2024, Номер unknown, С. 106481 - 106481
Опубликована: Окт. 1, 2024
Язык: Английский
Процитировано
1
Journal of Geophysical Research Atmospheres, Год журнала: 2023, Номер 128(24)
Опубликована: Дек. 12, 2023
Abstract Mineral dust is one of the most abundant types ice nucleating particles in atmosphere. During atmospheric transport, mineral can become coated with inorganic and organic solutes, which impact their nucleation activity. Aminium cations formed from amines are type solute that coat atmosphere, but effects on activity have not been studied. We investigated primary, secondary, tertiary aminium methyl ethyl groups, as well ammonium cations, K‐feldspar, an important dust, immersion freezing mode at low cation concentrations (0.2–20 mM) using a droplet‐freezing apparatus. Ammonium substantially increased consistent previous studies. In contrast, primary significantly reduced K‐feldspar activity, secondary had no significant effect (the was less than uncertainty our measurements). Our combined results following mechanisms: undergo ion exchange providing exposed N–H groups for hydrogen bonding ice; exposing hydrophobic tail effective do due to steric caused by multiple cation.
Язык: Английский
Процитировано
1