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Title: 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 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 L 3 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,more » which could otherwise be oxidized back to CO 2.« less

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1409582
Report Number(s):
BNL-114634-2017-JA¿¿¿
Journal ID: ISSN 2045-2322
DOE Contract Number:  
SC0012704
Resource Type:
Journal Article
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Barber, Andrew, Brandes, Jay, Leri, Alessandra, Lalonde, Karine, Balind, Kathryn, Wirick, Sue, Wang, Jian, and Gélinas, Yves. Preservation of organic matter in marine sediments by inner-sphere interactions with reactive iron. United States: N. p., 2017. Web. doi:10.1038/s41598-017-00494-0.
Barber, Andrew, Brandes, Jay, Leri, Alessandra, Lalonde, Karine, Balind, Kathryn, Wirick, Sue, Wang, Jian, & Gélinas, Yves. Preservation of organic matter in marine sediments by inner-sphere interactions with reactive iron. United States. doi:10.1038/s41598-017-00494-0.
Barber, Andrew, Brandes, Jay, Leri, Alessandra, Lalonde, Karine, Balind, Kathryn, Wirick, Sue, Wang, Jian, and Gélinas, Yves. Thu . "Preservation of organic matter in marine sediments by inner-sphere interactions with reactive iron". United States. doi:10.1038/s41598-017-00494-0.
@article{osti_1409582,
title = {Preservation of organic matter in marine sediments by inner-sphere interactions with reactive iron},
author = {Barber, Andrew and Brandes, Jay and Leri, Alessandra and Lalonde, Karine and Balind, Kathryn and Wirick, Sue and Wang, Jian and Gélinas, Yves},
abstractNote = {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.},
doi = {10.1038/s41598-017-00494-0},
journal = {Scientific Reports},
issn = {2045-2322},
number = 1,
volume = 7,
place = {United States},
year = {2017},
month = {3}
}

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