Influencing factors and mechanism by which DOM in groundwater releases Fe from sediment

Xia, Xuezhi; Teng, Yanguo; Zhai, Yuanzheng; Zheng, Fuxin; Cao, Xinyi

doi:10.1016/j.chemosphere.2022.134524

Cited by 20 publications

(7 citation statements)

References 64 publications

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“…As a result of OM adsorption, the minerals released dissolved Fe or Al to the solution. The dissolved Fe or Al concentration for all Fe and Al oxide systems increased with decreasing DOM removal ratio or increasing OM loading (Figure ), consistent with previous studies. , This suggests that DOM promoted dissolution of minerals likely through the ligand-promoted dissolution mechanism. , However, the solubilities of these minerals in the presence of DOM differed from each other. The allophane, boehmite, and amorphous alumina systems exhibited substantially higher solubilities with the dissolved Al concentration ranging from 0.05 to 0.35 mM, as opposed to the gibbsite and all Fe oxide systems with the dissolved Al or Fe concentration being 0.07 μM–0.02 mM.…”

Section: Resultssupporting

confidence: 89%

“…The dissolved Fe or Al concentration for all Fe and Al oxide systems increased with decreasing DOM removal ratio or increasing OM loading (Figure 2), consistent with previous studies. 47,48 This suggests that DOM promoted dissolution of minerals likely through the ligand-promoted dissolution mechanism. 47,48 However, the solubilities of these minerals in the presence of DOM differed from each other.…”

Section: Classification Of Elemental Compositions Based On H/c and O/cmentioning

confidence: 98%

“…47,48 This suggests that DOM promoted dissolution of minerals likely through the ligand-promoted dissolution mechanism. 47,48 However, the solubilities of these minerals in the presence of DOM differed from each other. The allophane, boehmite, and amorphous alumina systems exhibited substantially higher solubilities with the dissolved Al concentration ranging from 0.05 to 0.35 mM, as opposed to the gibbsite and all Fe oxide systems with the dissolved Al or Fe concentration being 0.07 μM−0.02 mM.…”

Section: Classification Of Elemental Compositions Based On H/c and O/cmentioning

confidence: 98%

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Controls of Mineral Solubility on Adsorption-Induced Molecular Fractionation of Dissolved Organic Matter Revealed by 21 T FT-ICR MS

Hu,

McKenna,

Wen

et al. 2024

Environ. Sci. Technol.

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Mineral adsorption-induced molecular fractionation of dissolved organic matter (DOM) affects the composition of both DOM and OM adsorbed and thus stabilized by minerals. However, it remains unclear what mineral properties control the magnitude of DOM fractionation. Using a combined technique approach that leverages the molecular composition identified by ultrahigh resolution 21 T Fourier transform ion cyclotron resonance mass spectrometry and adsorption isotherms, we catalogue the compositional differences that occur at the molecular level that results in fractionation due to adsorption of Suwannee River fulvic acid on aluminum (Al) and iron (Fe) oxides and a phyllosilicate (allophane) species of contrasting properties. The minerals of high solubility (i.e., amorphous Al oxide, boehmite, and allophane) exhibited much stronger DOM fractionation capabilities than the minerals of low solubility (i.e., gibbsite and Fe oxides). Specifically, the former released Al 3+ to solution (0.05−0.35 mM) that formed complexes with OM and likely reduced the surface hydrophobicity of the mineral-OM assemblage, thus increasing the preference for adsorbing polar DOM molecules. The impacts of mineral solubility are exacerbated by the fact that interactions with DOM also enhance metal release from minerals. For sparsely soluble minerals, the mineral surface hydrophobicity, instead of solubility, appeared to be the primary control of their DOM fractionation power. Other chemical properties seemed less directly relevant than surface hydrophobicity and solubility in fractionating DOM.

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Section: Resultssupporting

confidence: 89%

Section: Classification Of Elemental Compositions Based On H/c and O/cmentioning

confidence: 98%

Section: Classification Of Elemental Compositions Based On H/c and O/cmentioning

confidence: 98%

See 1 more Smart Citation

Controls of Mineral Solubility on Adsorption-Induced Molecular Fractionation of Dissolved Organic Matter Revealed by 21 T FT-ICR MS

Hu,

McKenna,

Wen

et al. 2024

Environ. Sci. Technol.

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“…However, if environmental conditions change (e.g. following seasonal redox changes, or physical disturbance of the sediments), sediment bound compounds can be released back into the overlying water [2]. Removal/re-release of chemical compounds at the sediment-water interface and in surface layers of the sediments can be dynamic processes in space and time [3].…”

Section: Introductionmentioning

confidence: 99%

Development and validation of an in situ high-resolution technique for measuring antibiotics in sediments

Li,

Rong,

Han

et al. 2024

Journal of Hazardous Materials

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“…Specifically, groundwater is one of the most commonly used water resources for drinking [ 5 , 6 , 7 ]. Therefore, there is always a need to provide and supply clean groundwater for drinking [ 8 , 9 ]. Arsenic (As) is a naturally occurring element with high toxicity and carcinogenic potential [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Evolution Mechanism of Arsenic Enrichment in Groundwater and Associated Health Risks in Southern Punjab, Pakistan

Baloch

Zhang

et al. 2022

IJERPH

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Arsenic (As) contamination in groundwater is a worldwide concern for drinking water safety. Environmental changes and anthropogenic activities are making groundwater vulnerable in Pakistan, especially in Central Punjab. This study explores the distribution, hydrogeochemical behavior, and pathways of As enrichment in groundwater and discusses the corresponding evolution mechanism, mobilization capability, and health risks. In total, 510 groundwater samples were collected from three tehsils in the Punjab province of Pakistan to analyze As and other physiochemical parameters. Arsenic concentration averaged 14.0 μg/L in Vehari, 11.0 μg/L in Burewala, and 13.0 μg/L in Mailsi. Piper-plots indicated the dominance of Na+, SO42−, Ca2+, and Mg2+ ions in the groundwater and the geochemical modeling showed negative saturation indices with calcium carbonate and salt minerals, including aragonite (CaCO3), calcite (CaCO3), dolomite (CaMg(CO3)2), and halite (NaCl). The dissolution process hinted at their potential roles in As mobilization in groundwater. These results were further validated with an inverse model of the dissolution of calcium-bearing mineral, and the exchange of cations between Ca2+ and Na+ in the studied area. Risk assessment suggested potential carcinogenic risks (CR > 10−4) for both children and adults, whereas children had a significant non-carcinogenic risk hazard quotient (HQ > 1). Accordingly, children had higher overall health risks than adults. Groundwater in Vehari and Mailsi was at higher risk than in Burewala. Our findings provide important and baseline information for groundwater As assessment at a provincial level, which is essential for initiating As health risk reduction. The current study also recommends efficient management strategies for As-contaminated groundwater.

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Influencing factors and mechanism by which DOM in groundwater releases Fe from sediment

Cited by 20 publications

References 64 publications

Controls of Mineral Solubility on Adsorption-Induced Molecular Fractionation of Dissolved Organic Matter Revealed by 21 T FT-ICR MS

Controls of Mineral Solubility on Adsorption-Induced Molecular Fractionation of Dissolved Organic Matter Revealed by 21 T FT-ICR MS

Development and validation of an in situ high-resolution technique for measuring antibiotics in sediments

Evolution Mechanism of Arsenic Enrichment in Groundwater and Associated Health Risks in Southern Punjab, Pakistan

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