Preservation of organic matter in marine sediments by inner-sphere interactions with reactive iron

Abstract Interactions between organic matter and mineral matrices are critical to the preservation of soil and sediment organic matter. In addition to clay minerals, Fe(III) oxides particles have recently been shown to be responsible for the protection and burial of a large fraction of sedimentary o...

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Autores principales:	Andrew Barber, Jay Brandes, Alessandra Leri, Karine Lalonde, Kathryn Balind, Sue Wirick, Jian Wang, Yves Gélinas
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/bf39ce12c0924907921986e80e0e0235
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spelling	oai:doaj.org-article:bf39ce12c0924907921986e80e0e02352021-12-02T11:40:22ZPreservation of organic matter in marine sediments by inner-sphere interactions with reactive iron10.1038/s41598-017-00494-02045-2322https://doaj.org/article/bf39ce12c0924907921986e80e0e02352017-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00494-0https://doaj.org/toc/2045-2322Abstract Interactions between organic matter and mineral matrices are critical to the preservation of soil and sediment organic matter. In addition to clay minerals, Fe(III) oxides particles have recently been shown to be responsible for the protection and burial of a large fraction of sedimentary organic carbon (OC). Through a combination of synchrotron X-ray techniques and high-resolution images of intact sediment particles, we assessed the mechanism of interaction between OC and iron, as well as the composition of organic matter co-localized with ferric iron. We present scanning transmission x-ray microscopy images at the Fe L3 and C K1 edges showing that the organic matter co-localized with Fe(III) consists primarily of C=C, C=O and C-OH functional groups. Coupling the co-localization results to iron K-edge X-ray absorption spectroscopy fitting results allowed to quantify the relative contribution of OC-complexed Fe to the total sediment iron and reactive iron pools, showing that 25–62% of total reactive iron is directly associated to OC through inner-sphere complexation in coastal sediments, as much as four times more than in low OC deep sea sediments. Direct inner-sphere complexation between OC and iron oxides (Fe-O-C) is responsible for transferring a large quantity of reduced OC to the sedimentary sink, which could otherwise be oxidized back to CO2.Andrew BarberJay BrandesAlessandra LeriKarine LalondeKathryn BalindSue WirickJian WangYves GélinasNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Andrew Barber Jay Brandes Alessandra Leri Karine Lalonde Kathryn Balind Sue Wirick Jian Wang Yves Gélinas Preservation of organic matter in marine sediments by inner-sphere interactions with reactive iron
description	Abstract Interactions between organic matter and mineral matrices are critical to the preservation of soil and sediment organic matter. In addition to clay minerals, Fe(III) oxides particles have recently been shown to be responsible for the protection and burial of a large fraction of sedimentary organic carbon (OC). Through a combination of synchrotron X-ray techniques and high-resolution images of intact sediment particles, we assessed the mechanism of interaction between OC and iron, as well as the composition of organic matter co-localized with ferric iron. We present scanning transmission x-ray microscopy images at the Fe L3 and C K1 edges showing that the organic matter co-localized with Fe(III) consists primarily of C=C, C=O and C-OH functional groups. Coupling the co-localization results to iron K-edge X-ray absorption spectroscopy fitting results allowed to quantify the relative contribution of OC-complexed Fe to the total sediment iron and reactive iron pools, showing that 25–62% of total reactive iron is directly associated to OC through inner-sphere complexation in coastal sediments, as much as four times more than in low OC deep sea sediments. Direct inner-sphere complexation between OC and iron oxides (Fe-O-C) is responsible for transferring a large quantity of reduced OC to the sedimentary sink, which could otherwise be oxidized back to CO2.
format	article
author	Andrew Barber Jay Brandes Alessandra Leri Karine Lalonde Kathryn Balind Sue Wirick Jian Wang Yves Gélinas
author_facet	Andrew Barber Jay Brandes Alessandra Leri Karine Lalonde Kathryn Balind Sue Wirick Jian Wang Yves Gélinas
author_sort	Andrew Barber
title	Preservation of organic matter in marine sediments by inner-sphere interactions with reactive iron
title_short	Preservation of organic matter in marine sediments by inner-sphere interactions with reactive iron
title_full	Preservation of organic matter in marine sediments by inner-sphere interactions with reactive iron
title_fullStr	Preservation of organic matter in marine sediments by inner-sphere interactions with reactive iron
title_full_unstemmed	Preservation of organic matter in marine sediments by inner-sphere interactions with reactive iron
title_sort	preservation of organic matter in marine sediments by inner-sphere interactions with reactive iron
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/bf39ce12c0924907921986e80e0e0235
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Preservation of organic matter in marine sediments by inner-sphere interactions with reactive iron

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