Roles of different molecular weights of dissolved organic matter in arsenic enrichment in groundwater: Evidences from ultrafiltration and EEM-PARAFAC

Li, Yongming; Guo, Huaming; Zheng, Hao; Xiu, Wei; He, Wei; Ding, Qian

doi:10.1016/j.apgeochem.2019.03.024

Cited by 64 publications

(14 citation statements)

References 69 publications

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“…and a relatively more refractory nature, whereas the tryptophan-like C2 fluorophore was less structurally condensed and more labile [34]. The highest FDOM appeared in pore water DC-2 by 98.52 QSU.…”

Section: Sources Of Dom Based On Spectral and Fluorescent Characterismentioning

confidence: 96%

“…Peaks at 250/440 nm and 315/440 nm were similar to the traditional terrestrial humic-like peak A and peak C [32], and spectral features were also similar to other reported terrestrial humic-like matter. These two short wavelength (UV and visible spectrum) humic-like peaks originated from fulvic-like substances [33,34]. This fraction of fluorophores were more hydrophobic, larger in molecular unit, and non-biodegradable [35].…”

Section: Sources Of Dom Based On Spectral and Fluorescent Characterismentioning

confidence: 99%

“…Protein-like substances with autochthonous sources were easily adsorbed onto the sediment minerals and/or retained by the microorganisms on the sediments [38,39]. It was suggested that humic-like components originated from microbial/algal activities, having probably been associated with a more condensed structure and larger molecular size and a relatively more refractory nature, whereas the tryptophan-like C2 fluorophore was less structurally condensed and more labile [34]. The highest FDOM appeared in pore water DC-2 by 98.52 QSU.…”

Section: Sources Of Dom Based On Spectral and Fluorescent Characterismentioning

confidence: 99%

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Optical Properties of Dissolved Organic Matter and Controlling Factors in Dianchi Lake Waters

Xiao

et al. 2019

Water

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Characterization of dissolved organic matter (DOM) is useful in understanding environment quality and carbon cycling in the lake system. In this study, the fluorescence of DOM, major ions, and nutrients in water were investigated to understand the sources and the transformation of DOM in Dianchi Lake, the sixth largest freshwater lake in China. The dissolved organic carbon content in water above the deposition layer was higher than 5 mg C∙L−1 but lower than that in pore water. Two primary components of humic (C1) and protein-like components (C2) were identified using parallel factor (PARAFAC) modeling on sample fluorescence spectra. Organic components were related to mineral structures, and encapsulation of bacterial or algal cells into particulates could be disintegrated to release DOM. The aromaticity and the hydrophobicity of optical properties were regulated by percentages of chromophores (CDOM) of DOM in surface water, whereas by percentages of fluorophores (FDOM) in DOM in pore water, the underlying water layer was defined as a belt of transition. The molecular weight enhanced with percentages of C1 in CDOM increased in water above the sediment layer and the pore water at the northern lake site, but molecular weight attenuated with percentages decreased in pore water at the southern lake site. DOM not only originated from particulate decomposition but also derived from internal transformation among different, dissolved organic molecules. Small molecules were aggregated into larger ones, and, conversely, large molecules decomposed into small sizes. Another speculation is that dissolved molecules adsorbed or were encapsulated into particulates or were degraded and released into dissolved phases. The precise factors regulated composition, structure, and spectral properties of dissolved organic matter in the Dianchi Lake. This study highlights that sources of DOM and transformation mechanisms in the lake water could be correlated with nutrients and primary geochemical factors for mobility and distribution in different water compartments.

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Section: Sources Of Dom Based On Spectral and Fluorescent Characterismentioning

confidence: 96%

Section: Sources Of Dom Based On Spectral and Fluorescent Characterismentioning

confidence: 99%

Section: Sources Of Dom Based On Spectral and Fluorescent Characterismentioning

confidence: 99%

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Optical Properties of Dissolved Organic Matter and Controlling Factors in Dianchi Lake Waters

Xiao

et al. 2019

Water

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“…Several studies have utilized EEMs in groundwater and terrestrial sediment NOM characterization in combination with other physicochemical analyses to draw connections among NOM qualities and environmental conditions ( Mladenov et al, 2010 ; Li et al, 2019 ; Huang et al, 2021 ). Huang et al utilized EEMs to characterize NOM in groundwaters with varying ammonium concentrations, finding that high-ammonium groundwaters exhibited increased humic-like signatures as compared to low-ammonium groundwaters, abundant in protein-like signatures ( Li et al, 2019 ). In addition to nutrients such as ammonium, mobilization of metals is a critical facet of environmental conditions that affect microbial activity in variable redox conditions.…”

Section: Current Analytical Chemistry Approachesmentioning

confidence: 99%

“… Mladenov et al (2010) demonstrated that groundwater collected at 11–14 m BGS exhibited lignin-like and aromatic NOM signatures, and that iron and arsenic mobilization may be associated with microbial consumption (and therefore absence) of labile NOM in the subsurface. Li et al (2019) further studied the effects of NOM on arsenic mobilization in the subsurface, demonstrating that humic-like NOM participates in arsenic complexation, further driving arsenic mobilization forward.…”

Section: Current Analytical Chemistry Approachesmentioning

confidence: 99%

Characterizing Natural Organic Matter Transformations by Microbial Communities in Terrestrial Subsurface Ecosystems: A Critical Review of Analytical Techniques and Challenges

Gushgari-Doyle

Chacon

et al. 2022

Front. Microbiol.

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Determining the mechanisms, traits, and pathways that regulate microbial transformation of natural organic matter (NOM) is critical to informing our understanding of the microbial impacts on the global carbon cycle. The capillary fringe of subsurface soils is a highly dynamic environment that remains poorly understood. Characterization of organo-mineral chemistry combined with a nuanced understanding of microbial community composition and function is necessary to understand microbial impacts on NOM speciation in the capillary fringe. We present a critical review of the popular analytical and omics techniques used for characterizing complex carbon transformation by microbial communities and focus on how complementary information obtained from the different techniques enable us to connect chemical signatures with microbial genes and pathways. This holistic approach offers a way forward for the comprehensive characterization of the formation, transformation, and mineralization of terrestrial NOM as influenced by microbial communities.

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Effect of the Molecular Weight of Humic Acids on the Adsorption of As(V) on Goethite

Xie,

Ma,

Ablat

et al. 2024

Water Air Soil Pollut

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Roles of different molecular weights of dissolved organic matter in arsenic enrichment in groundwater: Evidences from ultrafiltration and EEM-PARAFAC

Cited by 64 publications

References 69 publications

Optical Properties of Dissolved Organic Matter and Controlling Factors in Dianchi Lake Waters

Optical Properties of Dissolved Organic Matter and Controlling Factors in Dianchi Lake Waters

Characterizing Natural Organic Matter Transformations by Microbial Communities in Terrestrial Subsurface Ecosystems: A Critical Review of Analytical Techniques and Challenges

Effect of the Molecular Weight of Humic Acids on the Adsorption of As(V) on Goethite

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