iScience, Journal Year: 2024, Volume and Issue: 27(10), P. 110891 - 110891
Published: Sept. 12, 2024
Understanding the characteristics and sources of water-soluble ion pollution in particulate matter is crucial for preventing, controlling, managing air pollution. In this study, we analyzed ions PM
Language: Английский
Environmental Research Communications, Journal Year: 2023, Volume and Issue: 5(8), P. 081002 - 081002
Published: July 24, 2023
Abstract Brown carbon (BrC) has a large impact on the Earth’s radiative balance. This study examined BrC’s optical characteristics, chemical functional groups, and total organic (TOC) in deposited particulate matter from combustion of biomass, fossil fuels, mosquito coil. A UV–vis spectrophotometer was used to assess properties, TOC analyzer quantify TOC, attenuated reflection-fourier transform infrared spectroscopy (ATR-FTIR) identify group. The light absorption properties (absorption coefficient (b abs-BrC ), mass efficiency (MAE 365 angstrom exponent (AAE), refractive index (k )) were determined. Among biomasses, wheat straw exhibited greatest value b (27.26 × 10 3 ± 4.09 Mm −1 ) whereas maize had lowest (7.38 1.11 ). higher at nm suggested that chromophores contributed more process. AAE followed this sequence - coil (5.46 0.82) > biomass (5.13 1.45) fuels (2.85 0.32). highest MAE (0.99 0.15 m 2 gC k (0.028 0.004) obtained straw, (0.07 0.011 (0.002) identified octane. Biomasses samples showed strong peak ∼850, ∼1368, ∼1370, ∼1306, near 1640 cm , indicating major component BrC nitrate R-ONO which is responsible increase properties. It also contains complex heterocyclic aromatic ring compounds, carbonyl group (C=O), nitrogen-containing groups such as − NO C ≡ N . projected substantial contribution overall one illustration probable climatic effect biomasses fuel burning Southeast Asian region.
Language: Английский
Citations
11
Atmospheric Research, Journal Year: 2025, Volume and Issue: unknown, P. 108091 - 108091
Published: March 1, 2025
Language: Английский
Citations
0
Atmospheric Pollution Research, Journal Year: 2024, Volume and Issue: 15(4), P. 102062 - 102062
Published: Jan. 26, 2024
Language: Английский
Citations
1
Atmosphere, Journal Year: 2024, Volume and Issue: 15(4), P. 421 - 421
Published: March 28, 2024
Brown carbon (BrC) is a new term for organic aerosol (OA) with strong absorption ability from the visible to ultraviolet (UV) wavelengths, which plays vital role in atmospheric visibility and climate change. Herein, we report field measurements 1 March 2020 28 February 2021, sampled at urban Suzhou, Yangtze River Delta (YRD), China, investigate optical properties sources of BrC. By analyzing seasonal characteristics BrC 370 nm (babs370), babs370 was found be highest (9.0 ± 7.2 Mm−1) winter lowest (5.1 3.3 summer, respectively. The Ångström exponent (AAE) value 1.22 0.05, followed by 1.21 1.20 1.19 0.05 fall, spring, mass cross-section (MAC) secondary (SOC) 0.2 m2g−1 2.9 0.1 4.3 2.8 winter, significantly lower than that primary (POC) nm, suggesting aging process could weaken light Five different factors were identified positive matrix factorization (PMF) analysis, including biomass-burning-related, vehicle-related, sulfate-related, nitrate-related, dust-related factors, on average account 7.4%, 73.4%, 11.9%, 1.9%, 5.4% babs370, Potential Source Contribution Factor (PSCF) analysis showed those high periods mainly contributed air south. Moreover, influence degree potential source areas, sequence > spring fall summer. Our results improve understanding an important industrial city YRD, reduce uncertainty prediction its effect this region.
Language: Английский
Citations
0
iScience, Journal Year: 2024, Volume and Issue: 27(10), P. 110891 - 110891
Published: Sept. 12, 2024
Understanding the characteristics and sources of water-soluble ion pollution in particulate matter is crucial for preventing, controlling, managing air pollution. In this study, we analyzed ions PM
Language: Английский
Citations
0