Chemodiversity of coastal seawater dissolved organic matter shaped by wastewater treatment plant effluent in Tokyo Bay, Japan

Applied Geochemistry, Journal Year: 2025, Volume and Issue: unknown, P. 106292 - 106292

Published: Jan. 1, 2025

Language: Английский

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Suppressing Organic Bromine but Promoting Bromate: Is the Ultraviolet/Ozone Process a Double-Edged Sword for the Toxicity of Wastewater to Mammalian Cells?

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(26), P. 11649 - 11660

Published: June 14, 2024

Brominated byproducts and toxicity generation are critical issues for ozone application to wastewater containing bromide. This study demonstrated that ultraviolet/ozone (UV/O3, 100 mJ/cm2, 1 mg-O3/mg-DOC) reduced the cytotoxicity of from 14.2 mg pentol/L produced by ozonation 4.3 (1 mg/L bromide, pH 7.0). The genotoxicity was also 1.65 0.17 μg-4-NQO/L UV/O3. Compared with O3 alone, adsorbable organic bromine 25.8 5.3 μg/L UV/O3, but bromate increased 32.9 71.4 μg/L. UV/O3 process enhanced removal pre-existing precursors (highly unsaturated phenolic compounds poly aromatic hydrocarbons), while new were generated, yet combined effect on did not result in a significant change toxicity. Instead, UV radiation inhibited HOBr concentration through both rapid decomposition reduce production formed HOBr, thus suppressing AOBr formation. However, hydroxyl radical-dominated pathway led increase bromate. Considering bromate, effectively controlled mammalian cells, even though an emphasis should be placed managing elevated Futhermore, other end points needed evaluate outcomes process.

Language: Английский

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Optical Variation and Molecular Transformation of Brown Carbon During Oxidation by NO₃^• in the Aqueous Phase

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: unknown

Published: Feb. 6, 2024

The NO3•-driven nighttime aging of brown carbon (BrC) is known to greatly impact its atmospheric radiative forcing. However, the oxidation by NO3• on optical properties BrC in waters as well associated reaction mechanism remain unclear. In this work, we found that variation proxies under environmentally relevant exposure depends strongly their sources, with enhanced light absorptivity for biomass-burning but bleaching urban aerosols and humic substances. High-resolution mass spectrometry using FT-ICR MS shows leads formation light-absorbing species (e.g., nitrated organics) while destroying electron donors phenols) within charge transfer complexes substances, evidenced transient absorption spectroscopy NaBH4 reduction experiments well. Moreover, measured rate constants between real BrCs (k = (1.8 ± 0.6) × 107 MC–1s–1, expressed moles carbon) are much higher than those individual model organic (OC), suggesting OCs may be a previously ill-quantified important sink waters. This work provides insights into kinetics molecular transformation during NO3•, facilitating further evaluation BrC's climatic effects levels.

Language: Английский

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Irradiation and DOM mediate Lead Release from Polyvinyl Chloride Microplastics in Natural Surface Water

Journal of Hazardous Materials, Journal Year: 2025, Volume and Issue: 486, P. 137080 - 137080

Published: Jan. 1, 2025

Language: Английский

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Photic versus Aphotic Production of Organohalogens from Native versus Invasive Wetland Plants-Derived Dissolved Organic Matter

Water Research, Journal Year: 2025, Volume and Issue: 274, P. 123103 - 123103

Published: Jan. 7, 2025

Language: Английский

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Qualitatively elucidating the molecular characteristics of precursors for saturated halogenated disinfection byproducts in chlorinated urban eutrophic lake water by ultrahigh-resolution mass spectrometry

Journal of Hazardous Materials, Journal Year: 2025, Volume and Issue: 489, P. 137709 - 137709

Published: Feb. 22, 2025

Language: Английский

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Microbial welan gum production, chemistry and applications: A review

International Journal of Biological Macromolecules, Journal Year: 2025, Volume and Issue: unknown, P. 141640 - 141640

Published: March 1, 2025

Language: Английский

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Development of a Nontargeted Algorithm for Per- and Polyfluoroalkyl Substances in the FT-ICR Mass Spectra of Complex Organic Mixtures

Analytical Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: March 6, 2025

The unrivaled mass resolving power and subppm error enable the application of Fourier transform ion cyclotron resonance spectrometry (FT-ICR MS) for nontargeted screening per- polyfluoroalkyl substances (PFAS). Few automated FT-ICR MS methods exist analysis PFAS in solutions containing other dissolved organic matter. In this study, isotopic pattern dynamic homologous series inspection were complementarily employed FTMSDeu algorithm to simultaneously assign chemical formulas molecules, with an overall assignment accuracy 91.2% 1,802 unique their 11,634 formulas. negative effects fluorine-related isobaric isotopes sub-mDa differences on formula natural matter addressed by empirical F/(H + X) rule adoption a threshold number plus number. There 203 one novel formula, C9H6O4S1I1F11, identified fluoropolymer industry-impacted river water sample using our analyzing spectra. Overall, results study highlighted great potential updated high-throughput spectra complex mixtures from real environmental samples.

Language: Английский

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Sustainable Transformation of DOM in Sedimentation Sludge Water by UV-Fe2+/PAA: Toward Cleaner Production via FT-ICR MS

Journal of Cleaner Production, Journal Year: 2025, Volume and Issue: unknown, P. 145452 - 145452

Published: April 1, 2025

Language: Английский

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Simultaneous Elucidation of the Chemodiversity of Dissolved Organic Matter and Quantitation of Trace Organic Contaminant Sucralose by Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

Analytical Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: May 6, 2025

Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) has become a cutting-edge technique for molecular characterization of dissolved organic matter (DOM) and trace contaminants. Nevertheless, FT-ICR MS is rarely applied to simultaneously elucidate DOM chemodiversity quantify the concentrations Compared conventional solid-phase extraction (SPE), pH-dependent fractionation molecules using sequential SPE strategy significantly enhanced recovery carbon yielded more chemical formulas from environmental samples (p < 0.05). The at circumneutral pH provided exclusive isolation some hydrogen-rich oxygen-poor molecules, caused 5-fold reduction in matrix effects, improved detection limits structure typical wastewater indicator, sucralose, was successfully validated analysis with tandem hydrogen/deuterium exchange measurements. With standard addition method, quantitation sucralose extracts isolated were estimated be 0.26 0.87 μg/L, respectively. representative urban lake measured by (e.g., 0.9-4.1 μg/L) comparable those determined liquid chromatography coupled an Orbitrap analyzer. findings this study expand application research highlighting its potential identifying contaminants, quantifying their concentrations, elucidating inform contaminant sources aquatic systems.

Language: Английский

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