Release and Redistribution of Arsenic Associated with Ferrihydrite Driven by Aerobic Humification of Exogenous Soil Organic Matter

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: April 17, 2025

Humification of exogenous soil organic matter (ESOM) remodels the compositions and microbial communities soil, thus exerting potential impacts on biogeochemical transformation iron (hydr)oxides associated trace metals. Here, we conducted a 70-day incubation experiment to investigate how aerobic straw humification influenced repartitioning arsenic (As) with ferrihydrite in paddy soil. Results showed that was characterized by rapid OM degradation (1-14 days) subsequent slow maturation (14-70 days). During stage, considerable As (13.1 mg·L-1) released into aqueous phase, which reimmobilized solid phase stage. Meanwhile, low-crystalline structural As/Fe converted more stable species, subtle crystalline transformation. The generated highly unsaturated phenolic compounds enriched Enterobacter Sphingomonas induced (∼3.1%) As(V) reduction, leading release during In carboxylic-rich alicyclic molecules facilitated reimmobilization. Throughout process, organo-mineral complexes formed between via C-O-Fe bond contributed solid-phase stabilization. Collectively, this work highlighted ESOM humification-driven (hydr)oxide redistribution, advancing our understanding coupled behaviors C, Fe,

Language: Английский

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Flood irrigation increases the release of phosphorus from aquifer sediments into groundwater

Journal of Contaminant Hydrology, Journal Year: 2024, Volume and Issue: 261, P. 104297 - 104297

Published: Jan. 8, 2024

Language: Английский

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

Journal of Hydrology, Journal Year: 2024, Volume and Issue: 638, P. 131444 - 131444

Published: June 1, 2024

Language: Английский

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Revealing Degradation Pathways of Soluble and Dissolved Organic Matter in Alluvial-Lacustrine Aquifer Systems Impacted by High Levels of Geogenic Ammonium

Water Research, Journal Year: 2024, Volume and Issue: 264, P. 122215 - 122215

Published: Aug. 6, 2024

Language: Английский

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Is Microbially Produced Dissolved Organic Carbon a Missing Link in Natural Attenuation?

Groundwater Monitoring & Remediation, Journal Year: 2025, Volume and Issue: unknown

Published: March 4, 2025

Abstract Our research program characterizes dissolved organic carbon (DOC) generated in association with in‐situ hydrocarbon biodegradation. While this DOC has been thought to consist primarily of degradation intermediates, high‐resolution mass spectrometry (HRMS) analysis samples collected from the USGS's Bemidji site indicates that most chemical formulae identified impacted wells are also found unimpacted water samples. We recently proposed consists microbial products as a result de novo synthesis by organisms growing on supplied oil and is chemically consistent naturally occurring DOC. In note, we further evaluated our HRMS results focusing two electrochemical characteristics: identification potential redox pairs distribution average oxidation state HRMS‐identified formulae. hypothesize microbially produced acts pool compounds continuum states serves reversible electron buffer ability accept, store, donate electrons depending conditions. This allows disconnected time space reduction terminal acceptors (TEAs), such oxygen, Fe 3+ , or sulfate. Given concentrations may be high relative hydrocarbons TEAs, it suggests missing link understanding balance at sites undergoing natural attenuation.

Language: Английский

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A New 1,10-Phenanthroline Method for Oxalate-extractable Iron Measurement

Applied Geochemistry, Journal Year: 2025, Volume and Issue: unknown, P. 106354 - 106354

Published: March 1, 2025

Language: Английский

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Unraveling the fate of phosphorus in alluvial aquifers of the middle-lower Yellow River: Coupled natural and anthropogenic impacts

Journal of Contaminant Hydrology, Journal Year: 2025, Volume and Issue: unknown, P. 104551 - 104551

Published: March 1, 2025

Language: Английский

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Multi-Phase mobilization and degradation pathway of natural organic matter within alluvial-lacustrine aquifer sediments

Journal of Hydrology, Journal Year: 2025, Volume and Issue: unknown, P. 133310 - 133310

Published: April 1, 2025

Language: Английский

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Impact of Land Use Changes on Selenium Distribution and Bioavailability in Mollisol of Sanjiang Plain

Environmental Pollution, Journal Year: 2025, Volume and Issue: unknown, P. 126374 - 126374

Published: May 1, 2025

Language: Английский

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Contribution of Microbial Metabolism to Geogenic Phosphorus Enrichment in Groundwater: Insights from Metagenomic Sequencing and Organic Molecular Characterization

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: May 29, 2025

Microbial mediation in the enrichment of geogenic phosphorus (P) is often mentioned but rarely explored, especially P processes through mineralization dissolved organic matter (DOM) containing natural P. To bridge theoretical gap, this study investigated mechanisms microbially mediated P-containing DOM by adopting an approach combining comprehensive field investigation with hydrochemical and molecular biological analyses. The co-analysis dominant microbial community compositions genomics revealed that metabolism pathways involved biodegradation were associated level inorganic (DIP). Specifically, dephosphorylation was more pronounced under conditions limited DIP, while C-P bond cleavage primary metabolic pathway sufficient DIP. Co-occurrence network analysis further indicated substrates for DIP differed between cleavage, namely CHONSP1 compounds region highly unsaturated-low O (AI ≤ 0.5, H/C < 1.5, O/C 0.4) CHOP1 unsaturated-high ≥ 0.4), respectively. These findings provide new insights into groundwater from perspective have potential implications bioremediation P-contaminated at different contamination levels.

Language: Английский

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