Seasonal Trends and Site Differences of Nitroaromatic Compounds in PM2.5 in Sichuan Basin and Their Effects on Light Absorption of Brown Carbon DOI Creative Commons

Tian Tang,

Buyi Xu,

Hongli Tao

et al.

Toxics, Journal Year: 2025, Volume and Issue: 13(2), P. 124 - 124

Published: Feb. 6, 2025

Nitroaromatic compounds (NACs) have adverse effects on human health and climate. Daily PM2.5 samples were collected in winter summer of 2022 two cities, Chengdu (CD) Mianyang (MY), located Sichuan Basin southwestern China. Four types NACs PM2.5, containing nitrophenols, nitrocatechols, nitrosalicylic acids, nitronaphthol, analyzed. The mean concentration a total 10 (ΣNACs) at the suburban MY site (71.7 ± 35.6 ng m−3) was higher than that urban CD (29.5 16.2 m−3), while summer, concentrations ΣNACs cities similar, around 2.2 m−3. much attributed to impact biomass burning. 4-Nitrocatechol (4NC) most abundant species during sampling period, accounting for 35–56% mass. In winter, light absorption coefficient methanol-soluble brown carbon (Abs365,M) 10.5 3.4 13.6 4.3 Mm−1 MY, respectively, which about 4–7 times summer. contributions 365 nm Abs365,M 1.6–3.6% 0.5–0.7% with 4NC contributing among all NACs. geographical origins potential sources both sites mainly distributed within basin.

Language: Английский

Seasonal Trends and Site Differences of Nitroaromatic Compounds in PM2.5 in Sichuan Basin and Their Effects on Light Absorption of Brown Carbon DOI Creative Commons

Tian Tang,

Buyi Xu,

Hongli Tao

et al.

Toxics, Journal Year: 2025, Volume and Issue: 13(2), P. 124 - 124

Published: Feb. 6, 2025

Nitroaromatic compounds (NACs) have adverse effects on human health and climate. Daily PM2.5 samples were collected in winter summer of 2022 two cities, Chengdu (CD) Mianyang (MY), located Sichuan Basin southwestern China. Four types NACs PM2.5, containing nitrophenols, nitrocatechols, nitrosalicylic acids, nitronaphthol, analyzed. The mean concentration a total 10 (ΣNACs) at the suburban MY site (71.7 ± 35.6 ng m−3) was higher than that urban CD (29.5 16.2 m−3), while summer, concentrations ΣNACs cities similar, around 2.2 m−3. much attributed to impact biomass burning. 4-Nitrocatechol (4NC) most abundant species during sampling period, accounting for 35–56% mass. In winter, light absorption coefficient methanol-soluble brown carbon (Abs365,M) 10.5 3.4 13.6 4.3 Mm−1 MY, respectively, which about 4–7 times summer. contributions 365 nm Abs365,M 1.6–3.6% 0.5–0.7% with 4NC contributing among all NACs. geographical origins potential sources both sites mainly distributed within basin.

Language: Английский

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