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Significant Impact of a Daytime Halogen Oxidant on Coastal Air Quality.
Environ Sci Technol
January 2025
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong SAR 999077, China.
Chlorine radicals (Cl) are highly reactive and affect the fate of air pollutants. Several field studies in China have revealed elevated levels of daytime molecular chlorine (Cl), which, upon photolysis, release substantial amounts of Cl but are poorly represented in current chemical transport models. Here, we implemented a parametrization for the formation of daytime Cl through the photodissociation of particulate nitrate in acidic environments into a regional model and assessed its impact on coastal air quality during autumn in South China.
View Article and Find Full Text PDFAtmospheric aggravation potential of a wastewater treatment plant concerning organochlorine pesticides, polychlorinated biphenyls, and polybrominated diphenyl ether emissions.
Chemosphere
February 2025
Bursa Technical University, Department of Environmental Engineering, Bursa, Turkiye. Electronic address:
The pollution potential of a municipal wastewater treatment plant (WWTP) in Bursa, Türkiye, in terms of organochlorine pesticides (ΣOCPs), polychlorinated biphenyls (ΣPCBs), and polybrominated diphenyl ethers (ΣPBDEs), was investigated in air samples. Concentrations were determined using polyurethane foam disk samplers at key processes, such as the aeration tank (AT) and settling chamber (SC) of the WWTP and the background area (BA) at an urban site. Atmospheric concentration levels of PBDEs at the SC are 1.
View Article and Find Full Text PDFHalogenated bisphenol F compounds: Chlorination-mediated formation and photochemical fate in sunlit surface water.
Water Res
December 2024
Fujian Key Laboratory of Coastal Pollution Prevention and Control, College of the Environment & Ecology, Xiamen University, Xiamen 361102, China. Electronic address:
Halogenated bisphenol compounds are prevalent in urban water systems and may pose greater environmental risks than their bisphenol precursors. This study explored the formation of halogenated bisphenol F (BPF) in water chlorination and their subsequent transformation behaviors in receiving waters. The kinetics and pathways of BPF halogenation with chlorine, bromine, and iodine were firstly investigated.
View Article and Find Full Text PDFFate and Transformation of 15 Classes of Per- and Polyfluoroalkyl Substances in Aqueous Film-Forming Foam (AFFF)-Amended Soil Microcosms.
Environ Sci Technol
December 2024
Department of Biological and Environmental Engineering, Cornell University, Ithaca, New York 14853, United States.
The environmental fate of per- and polyfluoroalkyl substances (PFAS) in aqueous film-forming foams (AFFFs), especially those synthesized by electrochemical fluorination (ECF) processes, remains largely unknown. This study evaluated the transformation of AFFF-derived ECF-based precursors in aerobic soil microcosms amended with a historically used AFFF formulation (3M Light Water). Fifteen classes of PFAS, including AFFF components and transformation products, were identified or tentatively identified by suspect screening/nontargeted analysis (SSA/NTA) throughout a 308-day incubation.
View Article and Find Full Text PDFIncreasing Contribution of Chlorine Chemistry to Wintertime Ozone Formation Promoted by Enhanced Nitrogen Chemistry.
Environ Sci Technol
December 2024
Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
Article Synopsis
- - Chlorine radicals play a crucial role in atmospheric oxidation and pollutant behavior, but their interaction with nitrogen chemistry, specifically related to nitric oxide (NO), is not well understood.
- - This research provides evidence that increased levels of NO lead to daytime breakdown of nitrate and nighttime reactions between NO molecules, resulting in higher concentrations of chlorine-containing compounds after the Chinese Spring Festival.
- - The study emphasizes that the increase in nitrogen chemistry from NO significantly boosts chlorine reactions, ultimately enhancing the levels of ozone and the overall oxidative power of the atmosphere during winter days.
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