Marine Recalcitrant Dissolved Organic Matter Gained by Processing at Sandy Subterranean Estuaries

Environmental Science & Technology, Год журнала: 2025, Номер unknown

Опубликована: Фев. 13, 2025

The sandy subterranean estuary (STE) connecting fresh groundwater to saline sea water is characterized by strong geochemical (salinity, redox, and pH) gradients, with evidence emerging for its role as a hot spot consumption of labile substrates. This inspired us conduct study evaluate whether this holds true dissolved organic matter (DOM), especially given the still mysterious origin marine recalcitrant DOM. Here, characterization DOM 21 samples (depth 1-13 m, salinity 3.9‰ 32.4‰) across 65 m transect an STE located in coastal Guangdong, China, has found systematic biotransformation toward "recalcitrant" carboxyl-rich alicyclic molecules (CRAM). fraction CRAM (%CRAM) increases from 33.1% 76.7% increasing degree degradation salinity. Further, processing DOM, including more "biolabile" lower %CRAM released aquitard, active under oxic conditions than reducing conditions. Given large quantities that recirculates through STEs globally, amount (RDOM) entering ocean after likely be considerable. While studies are needed, can gain CRAM-like compounds way.

Язык: Английский

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Long-term and seasonal evaluation on environmental microbiology and water quality of Shanmei reservoir in southeast China

Environmental Pollution, Год журнала: 2025, Номер unknown, С. 125650 - 125650

Опубликована: Янв. 1, 2025

Язык: Английский

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Ammonium enrichment, nitrate attenuation and nitrous oxide production along groundwater flow paths: Carbon isotopic and DOM optical evidence

Journal of Hydrology, Год журнала: 2024, Номер 632, С. 130943 - 130943

Опубликована: Фев. 27, 2024

Язык: Английский

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Molecular characteristics of dissolved organic phosphorus in watershed runoff: Coupled influences of land use and precipitation

Journal of Environmental Sciences, Год журнала: 2024, Номер 148, С. 387 - 398

Опубликована: Фев. 1, 2024

Язык: Английский

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Degradation of phosphorus-containing natural organic matter facilitates enrichment of geogenic phosphorus in Quaternary aquifer systems: A molecular perspective

Journal of Hydrology, Год журнала: 2023, Номер 620, С. 129513 - 129513

Опубликована: Апрель 12, 2023

Язык: Английский

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Co-occurring characteristics and mechanisms of geogenic ammonium and phosphorus in Quaternary alluvial-lacustrine aquifer systems

Journal of Hydrology, Год журнала: 2024, Номер 638, С. 131444 - 131444

Опубликована: Июнь 1, 2024

Язык: Английский

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Characteristics and mechanism of phosphate removal by lanthanum modified bentonite in the presence of dissolved organic matter

Chemosphere, Год журнала: 2023, Номер 340, С. 139957 - 139957

Опубликована: Авг. 24, 2023

Язык: Английский

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Identification of methane cycling pathways in Quaternary alluvial-lacustrine aquifers using multiple isotope and microbial indicators

Water Research, Год журнала: 2023, Номер 250, С. 121027 - 121027

Опубликована: Дек. 16, 2023

Язык: Английский

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Evaluation of the current methods for assigning molecular formulas to dissolved organic matter using high resolution mass spectrometry

Scientific Reports, Год журнала: 2025, Номер 15(1)

Опубликована: Март 8, 2025

Understanding DOM composition is essential for investigating the biogeochemical carbon cycle and related elements. However, methods assigning molecular formulas (MF) in high-resolution mass spectrometry remain poorly defined, which often resulting misidentification of components. In this study, we established a metrics evaluation framework assessing assignment results each method based on similarity, accuracy correctness. We selected six then evaluated them using different settings elemental limits, filter rules selection rules. Our findings reveal that Formularity TRFU are most suitable MF DOM. These two show high similarity ratios (93–99%) low Bray-Curtis distances (0.13–0.14), indicating more substantial capability. Their correctness rates (86–87%) chemical diversity errors (0.14–0.39) indicate accurate results. Other methods, TEnvR, ICBM MFAssignR, with separate filters, unassigned error up to 47% ± 18%, potentially omitting certain At moderate dissolved organic concentrations, performs better, while outperforms at both concentrations. This study provides recommendations selecting analytical DOM, facilitating deeper understanding its properties role aquatic ecosystems.

Язык: Английский

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Dynamic mechanical properties of concrete containing cellulose fiber subject to coupling action of multiple impacts and high temperature erosion: Effects and mechanism

Construction and Building Materials, Год журнала: 2025, Номер 471, С. 140714 - 140714

Опубликована: Март 11, 2025

Язык: Английский

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