A review of secondary organic aerosols formation focusing on organosulfates and organic nitrates

Journal of Hazardous Materials, Journal Year: 2022, Volume and Issue: 430, P. 128406 - 128406

Published: Feb. 2, 2022

Language: Английский

---

Formation of Secondary Nitroaromatic Compounds in Polluted Urban Environments

Journal of Geophysical Research Atmospheres, Journal Year: 2022, Volume and Issue: 127(10)

Published: May 14, 2022

Abstract Nitroaromatic compounds (NACs) are important light absorption contributors to atmospheric brown carbon; however, their formation pathways and the key influential factors in polluted urban atmospheres largely unknown. Herein, we present molecular characterization of particulate NACs Shanghai by applying ultra‐high‐performance liquid chromatography coupled Orbitrap mass spectrometry, investigated seasonal diel variations pathways. The total number abundance increased significantly during air pollution episodes, these exhibited greatest relative among CHON compounds. 12 quantified higher levels winter (52.3 ± 29.1 ng m −3 ) than summer (7.83 3.30 ), owing masses mostly passing through northern heating regions. Among NACs, 4‐nitrophenol 4‐nitrocatechol were most abundant species. Most enhanced via photooxidation day summer, while day‐night not as obvious. Further analysis relevance suggested that nitrophenol its methylated derivatives mainly formed gas‐phase photochemical reactions, whereas aqueous‐phase oxidation processing could be an pathway form methyl‐nitrocatechols. Formation was relatively sensitive NO 2 under low‐NO x conditions, became independent high‐NO conditions. A larger fraction transformed into inorganic nitrate products when less abundant, implying would play more roles aerosol properties with decline concentrations.

Language: Английский

---

Elucidating Secondary Organic Aerosol Processes through High-Resolution Aerosol Mass Spectrometry in Beijing

Advances in Atmospheric Sciences, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 24, 2025

Language: Английский

---

Spatial and diurnal variations of aerosol organosulfates in summertime Shanghai, China: potential influence of photochemical processes and anthropogenic sulfate pollution

Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(20), P. 13433 - 13450

Published: Oct. 25, 2023

Abstract. Organosulfates (OSs) are ubiquitous aerosol components, which has seen intense research over years. However, spatial and diurnal variations in OS formation polluted atmospheres remain poorly understood. In this study, 130 species were quantified (or semi-quantified) ambient fine particulate matter (PM2.5) collected urban suburban Shanghai (East China) the summer of 2021. Isoprene- monoterpene-derived OSs dominant groups (averaging 51 % 19 total OSs, respectively), likely indicating a large biogenic contribution to summer. Most peaked during daytime, while nitrooxy-OSs (NOSm) increased nighttime. Accordingly, largely produced via daytime processes, rather than nighttime chemistry, except for NOSm. Additionally, although areas exhibited similar variations, average concentrations anthropogenic decreased significantly from site site. Furthermore, we concretized based on interactions among ultraviolet (UV), ozone (O3), sulfate (SO42-). Indeed, most correlated with values UV[O3][SO42-] both Shanghai. particular, correlation between major was stronger O3 SO42-; moreover, there no significant UV. Thus, higher events attributed enhanced photochemical processes level area. Overall, study provides field evidence influence important implications mitigation organic pollution.

Language: Английский

---

Comparative study of atmospheric brown carbon at Shanghai and the East China Sea: Molecular characterization and optical properties

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 941, P. 173782 - 173782

Published: June 5, 2024

Language: Английский

---

Detection of organosulfates and nitrooxy-organosulfates in Arctic and Antarctic atmospheric aerosols, using ultra-high resolution FT-ICR mass spectrometry

The Science of The Total Environment, Journal Year: 2020, Volume and Issue: 767, P. 144339 - 144339

Published: Dec. 29, 2020

Language: Английский

---

Chemical characteristics and sources of organosulfates, organosulfonates, and carboxylic acids in aerosols in urban Xi'an, Northwest China

The Science of The Total Environment, Journal Year: 2021, Volume and Issue: 810, P. 151187 - 151187

Published: Oct. 29, 2021

We investigated speciation and levels of organosulfates, organosulfonates as well carboxylic acids in aerosol samples collected during summer (2014) winter (2014/15) Xi'an, Northwest China, to improve understanding composition sources organic aerosols this region heavily affected by air pollution. Organosulfates are formed from reactive gas-phase compounds acidic sulfate aerosols, contributing secondary SOA. The show a large diversity organosulfur species line with other regions reflecting the high complexity SOA precursors. In samples, organosulfates isoprene prevalent due transport masses southern isoprene-emitting mountain forests. During winter, local or areas north city low population density very temperatures. estimated (768 ± 346 ng m-3) (938 374 more similar than expected given carbon indicating formation processes. observed an organosulfonate molecular weight 214 (C6H14O6S) at (254 232 but much lower concentrations (12 13 summer. High were mainly pH below about 2.5. Concentrations oxidation monoterpenes (5.2 2.7 m-3 summer). Phthalic acid was 90 29 correlated highly carbon, chloride potassium, common origin, most likely burning biomass plastic-containing waste. Further research is needed elucidate organosulfonates, impact on properties affecting e.g. health effects.

Language: Английский

---

Molecular Characterization of Organosulfate-Dominated Aerosols over Agricultural Fields from the Southern Great Plains by High-Resolution Mass Spectrometry

ACS Earth and Space Chemistry, Journal Year: 2022, Volume and Issue: 6(7), P. 1733 - 1741

Published: May 10, 2022

The molecular composition of organic aerosols, especially for day/nighttime variations organosulfates above agricultural fields, is not well understood despite profound impacts on regional climate, crop production, air quality, and human health. Here, nanospray desorption electrospray ionization with high-resolution mass spectrometry (nano-DESI-HRMS) used to interrogate the aerosols collected at Southern Great Plains, located in an region Oklahoma. Identified formulae featured carbon, hydrogen, oxygen (CHO), nitrogen (CHNO), and/or sulfur (CHOS, CHNOS), higher organosulfate proportions during daytime (41%) compared nighttime (30%). Nighttime increases CHO, CHNO, extremely low volatility carbon (ELVOC) species. However, due high relative humidity, phase state was found be more liquid-like than using parametrized glass transition temperatures. Aerosol from anthropogenically influenced plume (southerly winds) showed significant CHOS ELVOC By comparison chamber studies, species are suspected mixed biogenic anthropogenic origin, whereas CHNOS (not identified southerly suggested predominately origin. Overall, this study provides key insight into demonstrating dependence upon day/night cycles episodic emissions.

Language: Английский

---

Formation of organic sulfur compounds through SO<sub>2</sub>-initiated photochemistry of PAHs and dimethylsulfoxide at the air-water interface

Atmospheric chemistry and physics, Journal Year: 2022, Volume and Issue: 22(6), P. 4237 - 4252

Published: April 1, 2022

Abstract. The presence of organic sulfur compounds (OS) at the water surface acting as surfactants, may influence air-water interaction and contribute to new particle formation in atmosphere. However, impact ubiquitous anthropogenic pollutant emissions, such SO2 polycyclic aromatic hydrocarbons (PAHs) on OS interface still remains unknown. Here, we observe large amounts SO2, upon irradiation aqueous solutions containing typical PAHs, pyrene (PYR), fluoranthene (FLA), phenanthrene (PHE) well dimethylsulfoxide (DMSO). We rapid several gaseous OSs from light-induced heterogeneous reactions with either DMSO or a mixture PAHs (PAHs/DMSO), some these (e.g. methanesulfonic acid) are established secondary aerosol (SOA) precursors. A myriad unsaturated produced detected phase. tentative reaction pathways supported by theoretical calculations Gibbs energy reactions. Our findings provide insights into potential sources occurring (sea, lake, river) surface, that should be considered future model studies for better representation SOA processes.

Language: Английский

---

Field Evidence for Constraints of Nearly Dry and Weakly Acidic Aerosol Conditions on the Formation of Organosulfates

Environmental Science & Technology Letters, Journal Year: 2024, Volume and Issue: 11(9), P. 981 - 987

Published: Aug. 6, 2024

A global perspective on the abundance and formation of organosulfates (OSs) during field studies (relative humidity 53% to 77%) suggested that investigated particles are generally nondry acidic (pH < 6). However, key factors affecting OS in nearly dry weakly aerosol conditions remain elusive. This topic was resolved by examining composition OSs PM2.5 collected Urumqi (dry dusty) over a one-year period. Anthropogenic accounted for 49 ± 8% total OSs, indicating large anthropogenic contribution (particularly winter). The low liquid water (ALW) concentration (2 2 μg m–3) weak particle acidity = 7 2) summer were important limiting formation. increased ALW (100 70 5 1) winter significantly promoted production. most isoprene- monoterpene-derived also constrained unfavorable acidity, resulting biogenic levels being lower than winter. study provides observational evidence constraints dusty atmospheric conditions.

Language: Английский

---