Variation in oxidative potential of fine particulate matter and its association with chemical constituents at a regional site in India DOI
Shreya Dubey, Pooja Manwani,

Suman Yadav

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 954, P. 176159 - 176159

Published: Sept. 10, 2024

Chemical composition, optical properties, and oxidative potential of water- and methanol-soluble organic compounds emitted from the combustion of biomass materials and coal DOI Creative Commons
Tao Cao,

Meiju Li,

Chunlin Zou

et al.

Atmospheric chemistry and physics, Journal Year: 2021, Volume and Issue: 21(17), P. 13187 - 13205

Published: Sept. 6, 2021

Abstract. Biomass burning (BB) and coal combustion (CC) are important sources of brown carbon (BrC) in ambient aerosols. In this study, six biomass materials five types were combusted to generate fine smoke particles. The BrC fractions, including water-soluble organic (WSOC), humic-like substance (HULIS-C), methanol-soluble (MSOC), subsequently fractionated, their optical properties chemical structures then comprehensively investigated using UV–visible spectroscopy, proton nuclear magnetic resonance spectroscopy (1H NMR), fluorescence excitation–emission matrix (EEM) combined with parallel factor (PARAFAC) analysis. addition, the oxidative potential (OP) BB CC was measured dithiothreitol (DTT) method. results showed that WSOC, HULIS-C, MSOC accounted for 2.3 %–22 %, 0.5 %–10 6.4 %–73 % total mass combustion-derived PM2.5, respectively, extracting highest concentrations compounds. fractions had light absorption capacity (mass efficiency at 365 nm (MAE365): 1.0–2.7 m2/gC) both smoke, indicating contained more strong light-absorbing components. Therefore, may represent better than fractions. Some significant differences observed between emitted from higher MAE365 lower Ångström exponent values detected CC. EEM-PARAFAC identified four fluorophores: two protein-like, one humic-like, polyphenol-like fluorophores. protein-like substances dominant components WSOC (47 %–80 %), HULIS-C (44 %–87 (42 %–70 %). 1H-NMR suggested oxygenated aliphatic functional groups (H-C-O), whereas unsaturated (H-C-C= Ar−H). DTT assays indicated generally a stronger (DTTm, 2.6–85 pmol/min/µg) 0.4–11 pmol/min/µg), having OP HULIS-C. contributed half activity (63.1 ± 15.5 highlighting HULIS major contributor reactive oxygen species (ROS) production WSOC. Furthermore, principal component analysis Pearson correlation coefficients highly fluorophore C4 be active BrC.

Language: Английский

Citations

58
Seasonal and diurnal variation of PM2.5 HULIS over Xi'an in Northwest China: Optical properties, chemical functional group, and relationship with reactive oxygen species (ROS) DOI
Tian Zhang, Shasha Huang,

Diwei Wang

et al.

Atmospheric Environment, Journal Year: 2021, Volume and Issue: 268, P. 118782 - 118782

Published: Oct. 12, 2021

Language: Английский

Citations

45
Optical properties, chemical functional group, and oxidative activity of different polarity levels of water-soluble organic matter in PM2.5 from biomass and coal combustion in rural areas in Northwest China DOI
Shasha Huang, Yu Luo, Xin Wang

et al.

Atmospheric Environment, Journal Year: 2022, Volume and Issue: 283, P. 119179 - 119179

Published: May 17, 2022

Language: Английский

Citations

36
Optical properties, molecular characterizations, and oxidative potentials of different polarity levels of water-soluble organic matters in winter PM2.5 in six China's megacities DOI
Tian Zhang, Zhenxing Shen, Shasha Huang

et al.

The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 853, P. 158600 - 158600

Published: Sept. 8, 2022

Language: Английский

Citations

31
Light absorption properties and molecular profiles of HULIS in PM2.5 emitted from biomass burning in traditional “Heated Kang” in Northwest China DOI
Tian Zhang, Zhenxing Shen,

Yaling Zeng

et al.

The Science of The Total Environment, Journal Year: 2021, Volume and Issue: 776, P. 146014 - 146014

Published: Feb. 23, 2021

Language: Английский

Citations

39
Winter brown carbon over six of China's megacities: light absorption, molecular characterization, and improved source apportionment revealed by multilayer perceptron neural network DOI Creative Commons

Diwei Wang,

Zhenxing Shen, Qian Zhang

et al.

Atmospheric chemistry and physics, Journal Year: 2022, Volume and Issue: 22(22), P. 14893 - 14904

Published: Nov. 23, 2022

Abstract. Brown carbon (BrC) constitutes a large fraction of organic and exhibits strong light absorption properties, thus affecting the global radiation budget. In this study, we investigated chemical functional bonds, sources BrC in six megacities China, namely Beijing, Harbin, Xi'an, Chengdu, Guangzhou, Wuhan. The average values coefficient mass efficiency at 365 nm northern cities were higher than those southern by 2.5 1.8 times, respectively, demonstrating abundance present China's megacities. Fourier transform infrared (FT-IR) spectra revealed sharp intense peaks 1640, 1458–1385, 1090–1030 cm−1, which ascribed to aromatic phenols, confirming contribution primary emission (e.g., biomass burning coal combustion) BrC. addition, noted 860, 1280–1260, 1640 attributed organonitrate oxygenated phenolic groups, indicating that secondary also existed Positive matrix factorization (PMF) coupled with multilayer perceptron (MLP) neural network analysis was used apportion absorption. results showed emissions burning, tailpipe emissions, made major However, formation processes greater (17.9 %–21.2 %) (2.1 %–10.2 %). These can provide basis for more effective control reduce its impacts on regional climates human health.

Language: Английский

Citations

28
Oxidative potential of atmospheric brown carbon in six Chinese megacities: Seasonal variation and source apportionment DOI

Diwei Wang,

Xueting Yang,

Hongwei Lu

et al.

Atmospheric Environment, Journal Year: 2023, Volume and Issue: 309, P. 119909 - 119909

Published: June 15, 2023

Language: Английский

Citations

14
Brown carbon aerosols in the Indo-Gangetic Plain outflow: insights from excitation emission matrix (EEM) fluorescence spectroscopy DOI

Supriya Dey,

Arya Mukherjee,

Anuraag J. Polana

et al.

Environmental Science Processes & Impacts, Journal Year: 2021, Volume and Issue: 23(5), P. 745 - 755

Published: Jan. 1, 2021

Characterization of aerosol brown carbon (BrC) composition in the Indian context using excitation emission matrix (EEM) fluorescence coupled with PARAFAC analysis.

Language: Английский

Citations

30
Concentrations, optical properties and sources of humic-like substances (HULIS) in fine particulate matter in Xi'an, Northwest China DOI
Wei Yuan, Ru‐Jin Huang, Lu Yang

et al.

The Science of The Total Environment, Journal Year: 2021, Volume and Issue: 789, P. 147902 - 147902

Published: May 21, 2021

Language: Английский

Citations

27
The role of nitroaromatic compounds (NACs) in constraining BrC absorption in the Indo-Gangetic Plain (IGP) DOI

Archita Rana,

Sayantan Sarkar

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 917, P. 170523 - 170523

Published: Feb. 1, 2024

Language: Английский

Citations

4