Sulfate Reduction in Sediments Produces High Levels of Chromophoric Dissolved Organic Matter

Abstract Sulfate reduction plays an important role in altering dissolved organic matter (DOM) in estuarine and coastal sediments, although its role in the production of optically active chromophoric DOM (CDOM) and a subset of fluorescent DOM (FDOM) has not been previously investigated in detail. Fre...

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Autores principales:	Jenna L. Luek, Kaitlyn E. Thompson, Randolph K. Larsen, Andrew Heyes, Michael Gonsior
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0b84b9025bd24d61bdf2799702d56d5e
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spelling	oai:doaj.org-article:0b84b9025bd24d61bdf2799702d56d5e2021-12-02T12:32:04ZSulfate Reduction in Sediments Produces High Levels of Chromophoric Dissolved Organic Matter10.1038/s41598-017-09223-z2045-2322https://doaj.org/article/0b84b9025bd24d61bdf2799702d56d5e2017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-09223-zhttps://doaj.org/toc/2045-2322Abstract Sulfate reduction plays an important role in altering dissolved organic matter (DOM) in estuarine and coastal sediments, although its role in the production of optically active chromophoric DOM (CDOM) and a subset of fluorescent DOM (FDOM) has not been previously investigated in detail. Freshwater sediment slurries were incubated anaerobically with added sulfate and acetate to promote sulfate-reducing bacteria. Ultraviolet visible (UV-Vis) absorbance and 3-dimensional excitation emission matrix (EEM) fluorescence spectra were measured over a five weeks anaerobic dark incubation period. Parallel Factor Analysis (PARAFAC) of FDOM determined components that increased significantly during dark and anaerobic incubation matching three components previously considered of terrestrially-derived or humic-like origin published in the OpenFluor database. The observed FDOM increase was strongly correlated (R2 = 0.96) with the reduction of sulfate. These results show a direct experimental link between sulfate reduction and FDOM production, which impacts our understanding of coastal FDOM sources and early sediment diagenesis. As 3D fluorescence techniques are commonly applied to diverse systems, these results provide increasing support that FDOM can have many diverse sources not consistently captured by common classifications such as “humic-like” fluorescence.Jenna L. LuekKaitlyn E. ThompsonRandolph K. LarsenAndrew HeyesMichael GonsiorNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jenna L. Luek Kaitlyn E. Thompson Randolph K. Larsen Andrew Heyes Michael Gonsior Sulfate Reduction in Sediments Produces High Levels of Chromophoric Dissolved Organic Matter
description	Abstract Sulfate reduction plays an important role in altering dissolved organic matter (DOM) in estuarine and coastal sediments, although its role in the production of optically active chromophoric DOM (CDOM) and a subset of fluorescent DOM (FDOM) has not been previously investigated in detail. Freshwater sediment slurries were incubated anaerobically with added sulfate and acetate to promote sulfate-reducing bacteria. Ultraviolet visible (UV-Vis) absorbance and 3-dimensional excitation emission matrix (EEM) fluorescence spectra were measured over a five weeks anaerobic dark incubation period. Parallel Factor Analysis (PARAFAC) of FDOM determined components that increased significantly during dark and anaerobic incubation matching three components previously considered of terrestrially-derived or humic-like origin published in the OpenFluor database. The observed FDOM increase was strongly correlated (R2 = 0.96) with the reduction of sulfate. These results show a direct experimental link between sulfate reduction and FDOM production, which impacts our understanding of coastal FDOM sources and early sediment diagenesis. As 3D fluorescence techniques are commonly applied to diverse systems, these results provide increasing support that FDOM can have many diverse sources not consistently captured by common classifications such as “humic-like” fluorescence.
format	article
author	Jenna L. Luek Kaitlyn E. Thompson Randolph K. Larsen Andrew Heyes Michael Gonsior
author_facet	Jenna L. Luek Kaitlyn E. Thompson Randolph K. Larsen Andrew Heyes Michael Gonsior
author_sort	Jenna L. Luek
title	Sulfate Reduction in Sediments Produces High Levels of Chromophoric Dissolved Organic Matter
title_short	Sulfate Reduction in Sediments Produces High Levels of Chromophoric Dissolved Organic Matter
title_full	Sulfate Reduction in Sediments Produces High Levels of Chromophoric Dissolved Organic Matter
title_fullStr	Sulfate Reduction in Sediments Produces High Levels of Chromophoric Dissolved Organic Matter
title_full_unstemmed	Sulfate Reduction in Sediments Produces High Levels of Chromophoric Dissolved Organic Matter
title_sort	sulfate reduction in sediments produces high levels of chromophoric dissolved organic matter
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/0b84b9025bd24d61bdf2799702d56d5e
work_keys_str_mv	AT jennalluek sulfatereductioninsedimentsproduceshighlevelsofchromophoricdissolvedorganicmatter AT kaitlynethompson sulfatereductioninsedimentsproduceshighlevelsofchromophoricdissolvedorganicmatter AT randolphklarsen sulfatereductioninsedimentsproduceshighlevelsofchromophoricdissolvedorganicmatter AT andrewheyes sulfatereductioninsedimentsproduceshighlevelsofchromophoricdissolvedorganicmatter AT michaelgonsior sulfatereductioninsedimentsproduceshighlevelsofchromophoricdissolvedorganicmatter
_version_	1718394139258650624

Sulfate Reduction in Sediments Produces High Levels of Chromophoric Dissolved Organic Matter

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