Nitrate-Photolysis Shortens the Lifetimes of Brown Carbon Tracers from Biomass Burning DOI
Yi Liu, Ru‐Jin Huang, Chunshui Lin

и другие.

Environmental Science & Technology, Год журнала: 2024, Номер unknown

Опубликована: Дек. 27, 2024

Biomass burning is an important source of brown carbon (BrC) aerosols, which influence climate by affecting the Earth's radiative balance. However, transformation pathways BrC chromophores, especially in presence photochemically active species, such as nitrate, are not well understood. In this study, nitrate-mediated aqueous-phase photooxidation three typical chromophores from biomass was investigated, including 4-nitrocatechol, 3-nitrosalicylic acid, and 3,4-dinitrophenol. Variations nitrate concentrations, pH, temperatures were systematically examined to assess their impacts on apparent photolysis rates these chromophores. The results show that increasing concentrations significantly enhances 3–3.5 times compared nitrate-free conditions. Also, a temperature rise 0 30 °C increases factor 1.3–2.5 for effect pH varies among depending substituents positions benzene ring. High-resolution mass spectrometric analysis suggests initiates with addition nitro and/or hydroxyl groups ring, followed ring-opening reaction formation smaller, highly oxygenated molecules formic glyoxylic malonic nitropropanoic acid. This study highlights key role BrC, altering aging shortening atmospheric lifetimes BrC. These particular importance better understanding its forcing, given increase fraction aerosols China recent years.

Язык: Английский

Inconsistent capacity of potential HONO sources to enhance secondary pollutants: evidence from WRF-Chem modeling DOI
Jingwei Zhang,

Haiyan Ran,

Yu Qu

и другие.

Journal of Environmental Sciences, Год журнала: 2025, Номер unknown

Опубликована: Фев. 1, 2025

Язык: Английский

Процитировано

4
Exploring Photochemical Conversion of NO2 to HONO on N-Heterocycles: Unique Variation Trend of Gases, Kinetics, and Mechanism DOI

Wangjin Yang,

Xue Dong He,

Xiangli Nan

и другие.

Environmental Science & Technology, Год журнала: 2025, Номер unknown

Опубликована: Фев. 11, 2025

The photochemical conversion of NO2 to nitrous acid (HONO) on N-heterocycles and the corresponding benzene compounds was investigated through a flow tube reactor coupled with methods spectroscopy, mass spectrum, theoretical calculation. average uptake coefficient organics during 1 h (γa) varied in range (1.1–8.0) × 10–6. Light led an increase γa by factor 2.2–11.5 times. HONO generated electron transfer from excited NO2, as shown linear correlation formation (e–) production organics. Especially, temporal variation concentrations 9-methyl acridine (MA-N) showed unique trend, where increased time. reaction MA-N nitrogen-/oxygen-containing species well demethylation species. coexistence oxygen-containing species, including acridone hydroxy-methylacridine, had synergistic effect HONO. According experimental results, it speculated that heterogeneous between could contribute source strength lower than 660 ppt h–1 near-ground surface 92 aloft air.

Язык: Английский

Процитировано

0
Size-segregated nitrated aromatic compounds in PM10 and potential health risks in Guangzhou, south China DOI
Le Fang, Runqi Zhang, Sheng Li

и другие.

Atmospheric Environment, Год журнала: 2025, Номер unknown, С. 121145 - 121145

Опубликована: Март 1, 2025

Язык: Английский

Процитировано

0
Aqueous phase photolysis of 4-nitrocatechol: Reaction kinetics, evolutions of chemical composition, light absorption and oxidation potential DOI

Ruoyuan Lei,

Sha Yu,

Haifeng Meng

и другие.

Atmospheric Environment, Год журнала: 2024, Номер unknown, С. 120981 - 120981

Опубликована: Дек. 1, 2024

Язык: Английский

Процитировано

1
Nitrate-Photolysis Shortens the Lifetimes of Brown Carbon Tracers from Biomass Burning DOI
Yi Liu, Ru‐Jin Huang, Chunshui Lin

и другие.

Environmental Science & Technology, Год журнала: 2024, Номер unknown

Опубликована: Дек. 27, 2024

Biomass burning is an important source of brown carbon (BrC) aerosols, which influence climate by affecting the Earth's radiative balance. However, transformation pathways BrC chromophores, especially in presence photochemically active species, such as nitrate, are not well understood. In this study, nitrate-mediated aqueous-phase photooxidation three typical chromophores from biomass was investigated, including 4-nitrocatechol, 3-nitrosalicylic acid, and 3,4-dinitrophenol. Variations nitrate concentrations, pH, temperatures were systematically examined to assess their impacts on apparent photolysis rates these chromophores. The results show that increasing concentrations significantly enhances 3–3.5 times compared nitrate-free conditions. Also, a temperature rise 0 30 °C increases factor 1.3–2.5 for effect pH varies among depending substituents positions benzene ring. High-resolution mass spectrometric analysis suggests initiates with addition nitro and/or hydroxyl groups ring, followed ring-opening reaction formation smaller, highly oxygenated molecules formic glyoxylic malonic nitropropanoic acid. This study highlights key role BrC, altering aging shortening atmospheric lifetimes BrC. These particular importance better understanding its forcing, given increase fraction aerosols China recent years.

Язык: Английский

Процитировано

0