Hidden Role of Organic Matter in the Immobilization and Transformation of Iodine on Fe-OM Associations

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(22), P. 9840 - 9849

Published: May 22, 2024

The biogeochemical processes of iodine are typically coupled with organic matter (OM) and the dynamic transformation iron (Fe) minerals in aquifer systems, which further regulated by association OM Fe minerals. However, roles mobility on Fe-OM associations remain poorly understood. Based batch adsorption experiments subsequent solid-phase characterization, we delved into immobilization iodate iodide different C/Fe ratios under anaerobic conditions. results indicated that a higher ratio (=1) exhibited greater capacity for immobilizing (∼60–80% iodate), was attributed to affinity significantly decreased extent Fe(II)-catalyzed caused associated OM. compounds abundant oxygen high unsaturation were more preferentially ferrihydrite than those poor low unsaturation; thus, capable binding 28.1–45.4% reactive iodine. At comparable ratios, mobilization aromatic susceptible complexes compared coprecipitates. These new findings contribute deeper understanding cycling is controlled environments.

Language: Английский

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Effect of Organic Matter on Iodine Migration and Transformation in Groundwater

Advances in Environmental Protection, Journal Year: 2025, Volume and Issue: 15(01), P. 38 - 43

Published: Jan. 1, 2025

Language: Английский

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Sources and fate of nitrate in the unsaturated zone in an alluvial-lacustrine plain

Journal of Hazardous Materials, Journal Year: 2025, Volume and Issue: 490, P. 137721 - 137721

Published: Feb. 24, 2025

Language: Английский

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Spatial distribution and formation mechanisms of high‑iodine groundwater throughout China

Earth-Science Reviews, Journal Year: 2025, Volume and Issue: unknown, P. 105134 - 105134

Published: April 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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The Competitive/Cooperative Dynamics of Sulfur Disproportionation Microbes and Methanogens in Geogenic High-Iodine Groundwater Systems

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

Published: May 7, 2025

The microbial transformation of iodine-bearing organic matter (OM) and iron (Fe) minerals is a critical process that controls the release iodine (I) to groundwater. However, roles functional types, OM molecular characteristics, microbe-OM interactions in mobilization remain unclear. In this study, groundwater samples with different concentrations were collected from central Yangtze River basins, China. Using 16S rRNA gene sequencing, we identified sulfur disproportionation methanogenesis as dominant metabolic processes relatively low-I (<300 μg/L) high-I (>300 groundwater, respectively. Sediment incubation experiments showed combined can promote by 87.1%. Ultrahigh-resolution characterization components revealed sulfur-disproportionating microbes may selectively metabolize bioactive (e.g., aliphatic compounds oxygen-poor highly unsaturated compounds), leaving recalcitrant N-containing oxygen-rich compounds, polyphenols, polycyclic aromatic compounds) methanogenic preferentially consume Thus, cooperative-competitive pattern between methanogens disproportionating microorganisms influence degradation potentially contribute mobilization. This study highlights process, driven biological methanogenesis, promotes enrichment alluvial-lacustrine improves our understanding genesis geogenic high-iodine systems.

Language: Английский

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Decoding the Role of Organic Matter in Groundwater Feammox Processes: Insights from the Yangtze River Paleochannel

Water Research, Journal Year: 2025, Volume and Issue: 284, P. 123920 - 123920

Published: May 27, 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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Coupled Transformation Pathways of Iron Minerals and Natural Organic Matter Related to Iodine Mobilization in Alluvial-Lacustrine Aquifer

Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 480, P. 135944 - 135944

Published: Sept. 24, 2024

Language: Английский

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