Arsenic biogeochemical cycling association with basin-scale dynamics of microbial functionality and organic matter molecular composition

Water Research, Год журнала: 2024, Номер 251, С. 121117 - 121117

Опубликована: Янв. 8, 2024

Язык: Английский

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Selective utilization of organic carbon molecules promotes arsenic methylation by increasing methyltransferase activity in arsM-harboring microbes of paddy soils

Soil Biology and Biochemistry, Год журнала: 2024, Номер 190, С. 109305 - 109305

Опубликована: Янв. 2, 2024

Язык: Английский

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Ammonium-Enhanced Arsenic Mobilization from Aquifer Sediments

Environmental Science & Technology, Год журнала: 2024, Номер unknown

Опубликована: Фев. 5, 2024

Ammonium-related pathways are important for groundwater arsenic (As) enrichment, especially via microbial Fe(III) reduction coupled with anaerobic ammonium oxidation; however, the key (and microorganisms) underpinning ammonium-induced and their contributions to As mobilization in still unknown. To address this gap, aquifer sediments hosting high from western Hetao Basin were incubated 15N-labeled external organic carbon sources (including glucose, lactate, lactate/acetate). Decreases concentrations positively correlated increases total produced Fe(II) (Fe(II)tot) released As. The molar ratios of Fe(II)tot oxidized ranged 3.1 3.7 all incubations, δ15N values N2 headspace increased ammonium-treated series, suggesting as end product oxidation. addition release by 16.1% 49.6%, which was more pronounced when copresented electron donors. Genome-resolved metagenomic analyses (326 good-quality MAGs) suggested that system required syntrophic metabolic interactions between bacterial archaeal current results highlight significance ammonium-stimulated driving mobilization, is underestimated groundwater.

Язык: Английский

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Groundwater arsenic and antimony mobility from an antimony mining area: Controls of sulfide oxidation, carbonate and silicate weathering, and secondary mineral precipitation

Water Research, Год журнала: 2025, Номер 273, С. 123086 - 123086

Опубликована: Янв. 1, 2025

Язык: Английский

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Hydrogen gas oxidation-driven reductive dissolution of solid-phase arsenic contributing to arsenite pollution in groundwater: Insights from metagenomic and microcosm analyses

Journal of Hazardous Materials, Год журнала: 2025, Номер unknown, С. 137444 - 137444

Опубликована: Янв. 1, 2025

Язык: Английский

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Refractory Humic-like Substances: Tracking Environmental Impacts of Anthropogenic Groundwater Recharge

Environmental Science & Technology, Год журнала: 2020, Номер 54(24), С. 15778 - 15788

Опубликована: Ноя. 20, 2020

To unravel the crucial components of natural organic matter that respond to process anthropogenic groundwater recharge (AGR) from different water sources, dissolved (DOM) and base-extractable particulate (POM) in surface were analyzed using excitation–emission matrix spectroscopy coupled with parallel factor analysis (EEM–PARAFAC). The EEM traditional spectral indices samples show fluorescent intensity, molecular weight, humification degree DOM relatively higher than those POM, reclaimed area (RWRA) was more contaminated south-to-north (SNWRA). PARAFAC indicates dominated by an allochthonous humic-like substance (C1), whereas POM tryptophan-like substances associated microbial activity (C2). Partitioning between showed (C1 C4) likely be distributed into a phase compared protein-like (C2 C3), which suggested potential use C1 C4 as tracking indicator. In particular, clear gradient distributions along both hydrogeological profile aquifer systems terms concentration composition also discriminated RWRA SNWRA regard effects various AGRs on groundwater. association water-quality indicators revealed principal component further indicated refractory would track environmental impacts intentional AGR processes.

Язык: Английский

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Novel Insights into Dissolved Organic Matter Processing Pathways in a Coastal Confined Aquifer System with the Highest Known Concentration of Geogenic Ammonium

Environmental Science & Technology, Год журнала: 2021, Номер 55(21), С. 14676 - 14688

Опубликована: Окт. 22, 2021

High levels of geogenic ammonium in groundwater is a highly neglected nitrogen pool coastal aquatic systems. Although organic matter (OM) mineralization known to significantly influence enrichment, the detailed mechanism underlying enrichment based on dissolved (DOM) characterization aquifer systems remains unclear. In this study, we characterized optical and molecular signatures DOM coupled with hydrogeochemistry multiple isotopes (H/O/C/N) elucidate detail mechanisms anomalously high confined system Pearl River Delta, which exhibits highest reported concentration Earth. We identified three fluorescent components, marine humic-like component (C1) two other components (C2 C3). The autochthonous OM was first processed C1 component, further transformed C2 C3 components. terms classes, processing pathway from bacterial- or algal-derived aliphatic compounds unsaturated-low O identified, were accumulated as main products. Compounds containing N atoms processed, one atom gradually accumulated, degraded into CHO compounds. (up 179 mg/L N) enriched due decomposition CHO+3N CHO+2N, CHO+1N, Owing longer residence time less frequent fresh water flushing, produced retained "long-term result". contrasting characteristics, together differing depositional hydrogeological conditions, give rise higher compared inland alluvial–lacustrine To our knowledge, study characterize its relationship

Язык: Английский

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Dissolved organic matter characterization in high and low ammonium groundwater of Dongting Plain, central China

Ecotoxicology and Environmental Safety, Год журнала: 2020, Номер 208, С. 111779 - 111779

Опубликована: Дек. 11, 2020

High levels of ammonium in groundwater is a potential threat to drinking water security and ecological status. The role dissolved organic matter (DOM) mobilization natural crucial but the intrinsic link between them has still been poorly understood. This study used high-pressure size exclusion chromatography (HPSEC) fluorescence excitataion-emission-matrix spectra (EEMs) with parallel factor analysis (PARAFAC) elucidate influence DOM characteristics systems having contrastive Dongting Plain, central Yangtze River. results indicate that NH4+-N concentration western plain (0–16.75 mg/L) are much higher compared southern (0–1.5 mg/L). more reductive environment characterized by larger molecular weight (MW) lower polydispersity (ρ), whereas relatively small high detected south oxidative condition. index (f450/500) biological (BIX), dominated terrestrial humic-like component amounts microbial components. Protein-like main f450/500 BIX. correlates well increases significantly content component, indicating closely associated weight. further enriches theory on Quaternary alluvial-lacustrine aquifer provides theoretical basis for local supply security.

Язык: Английский

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Identification of processes mobilizing organic molecules and arsenic in geothermal confined groundwater from Pliocene aquifers

Water Research, Год журнала: 2021, Номер 198, С. 117140 - 117140

Опубликована: Апрель 11, 2021

Язык: Английский

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Hydrogeochemical analysis and groundwater pollution source identification based on self-organizing map at a contaminated site

Journal of Hydrology, Год журнала: 2022, Номер 616, С. 128839 - 128839

Опубликована: Ноя. 28, 2022

Язык: Английский

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