Interactions of thiols with sedimentary particulate phase: studies of 3-mercaptopropionate in salt marsh sediments from Shelter Island, New York

Vairavamurthy, Murthy A.; Manowitz, B.; Maletic, Dusan; Wolfe, Helen

doi:10.1016/s0146-6380(97)00019-3

Cited by 22 publications

(9 citation statements)

References 36 publications

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“…55 Recently, it was suggested that such particle-bound reactive polysulfides are formed by the reaction of inorganic polysulfides with active sites on humics coated on mineral particles. 56 Thus, particle-bound polysulfides could also be considered as humic-bound polysulfides. In this view, the reactivity of the particle-bound polysulfides can be ascribed to the fact that the free end of the polysulfide chain is available for reactions with other reactive molecules (such as thiols and compounds with activated unsaturated bonds), while the other end of the chain is attached to the humic macromolecule.…”

Section: Resultsmentioning

confidence: 99%

Characterization of Sulfur-Containing Functional Groups in Sedimentary Humic Substances by X-ray Absorption Near-Edge Structure Spectroscopy

et al. 1997

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Humic substances, which are randomly cross-linked heterogeneous organic materials of high molecular weight, comprise a major fraction of the organic matter in soils and sediments. Because humic substances have a variety of functional groups, they play a major role in controlling the physical and chemical characteristics of natural waters, soils, and sediments. Sedimentary humic substances are considered to be the precursors of petroleum-forming kerogens. Sulfur is thought to play a major role in forming humic substances in anoxic marine sediments. Because of their structural heterogeneity, humic substances are not easily amenable to biochemical degradation and, thus, are generally considered to be biologically refractory. The complexity and heterogeneity of humic substances render the elucidation of their chemical structure a major analytical challenge. Degradative techniques, such as pyrolysis GC−MS, can change a sample's structure during preparation and analysis and, thus, may give inaccurate information. In this study, we investigated the sulfur-containing functional groups in humic acids from various marine sediments using XANES spectroscopy which has proved to be an important, nondestructive tool for analyzing sulfur forms. Humic acids were isolated from near-surface sediments from three locations: a salt marsh in Shelter Island, NY; the Peru Margin; and Florida Bay. We found that organic sulfides, di- and polysulfides, sulfonates, and organic sulfates are the major forms of sulfur in these sedimentary humics. The reduced-sulfur structures, organic sulfides, and di- and polysulfides, are essentially intramolecular as opposed to the highly oxidized forms of sulfur, sulfonates, and ester-bonded sulfates, which can only be present as end groups. The abundance of the reduced-sulfur structures reflects the extent to which sulfur is involved in forming intramolecular cross-links which are crucial for building up the macromolecular structures of humic substances. The significance of the presence of the different sulfur functionalities in humic substances is discussed in relation to early diagenesis and preservation of organic matter in marine sediments.

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Section: Resultsmentioning

confidence: 99%

Characterization of Sulfur-Containing Functional Groups in Sedimentary Humic Substances by X-ray Absorption Near-Edge Structure Spectroscopy

et al. 1997

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“…Deeper in the profiles, the differences in MMHg concentrations and percentage patterns between cores can be related to the decrease of LMW ligand with depth (Vairavamurthy et al, 1997) and to their respective amounts of H 2 S and Fe in PWs. Our set of cores can be divided in three groups with PWs H 2 S ˃ Fe in the entire HU and CH profiles, H 2 S ≥ Fe in core BCt and H 2 S ≤ Fe in core BE (Fig.…”

Section: Om Fe and S Control On The Mmhg Accumulation In Sediment Anmentioning

confidence: 97%

Diagenetic production, accumulation and sediment-water exchanges of methylmercury in contrasted sediment facies of Lake Titicaca (Bolivia)

Guédron

Audry²,

Achá³

et al. 2020

Science of The Total Environment

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“…During most of the year, continuously high polysulfide concentrations will promote chemical reactions between polysulfide-S 0 and biogenic organic matter. Products will include polysulfide-linked macromolecules, as shown in studies by Vairavamurthy et al (1997b), Adam et al (1998), Amrani and Aizenshtat (2004) and Amrani et al (2007). In fully aerated, pH 3.5 solutions, macromolecular polysulfides are stable for at least two days (Hutchinson et al, 2001), implying that they would be likely to survive the short-term acidification and purging involved in determining RSS NV .…”

Section: Seasonal Behavior Of Rss Tnvmentioning

confidence: 98%

Reduced sulfur species in a stratified seawater lake (Rogoznica Lake, Croatia); seasonal variations and argument for organic carriers of reactive sulfur

Bura-Nakić

Helz

Ciglenečki

et al. 2009

Geochimica et Cosmochimica Acta

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Interactions of thiols with sedimentary particulate phase: studies of 3-mercaptopropionate in salt marsh sediments from Shelter Island, New York

Cited by 22 publications

References 36 publications

Characterization of Sulfur-Containing Functional Groups in Sedimentary Humic Substances by X-ray Absorption Near-Edge Structure Spectroscopy

Characterization of Sulfur-Containing Functional Groups in Sedimentary Humic Substances by X-ray Absorption Near-Edge Structure Spectroscopy

Diagenetic production, accumulation and sediment-water exchanges of methylmercury in contrasted sediment facies of Lake Titicaca (Bolivia)

Reduced sulfur species in a stratified seawater lake (Rogoznica Lake, Croatia); seasonal variations and argument for organic carriers of reactive sulfur

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