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Elemental, isotopic, and spectroscopic assessment of chemical fractionation of dissolved organic matter sampled with a portable reverse osmosis system.

Author(s): Ouellet A, Catana D, Plouhinec JB, Lucotte M, Gélinas Y

Environ Sci Technol. 2008 Apr 01;42(7):2490-5 Authors: Ouellet A, Catana D, Plouhinec JB, Lucotte M, Gélinas Y

Article GUID: 18504986
Anthropogenic and natural methane emissions from a shale gas exploration area of Quebec, Canada.

Author(s): Pinti DL, Gelinas Y, Moritz AM, Larocque M, Sano Y

Sci Total Environ. 2016 Oct 01;566-567:1329-1338 Authors: Pinti DL, Gelinas Y, Moritz AM, Larocque M, Sano Y

Article GUID: 27267724
Persistence of Escherichia coli in batch and continuous vermicomposting systems.

Author(s): Hénault-Ethier L, Martin VJ, Gélinas Y

Waste Manag. 2016 Oct;56:88-99 Authors: Hénault-Ethier L, Martin VJ, Gélinas Y

Article GUID: 27499290
Food-Web Complexity in Guaymas Basin Hydrothermal Vents and Cold Seeps.

Author(s): Portail M, Olu K, Dubois SF, Escobar-Briones E, Gelinas Y, Menot L, Sarrazin J

PLoS One. 2016;11(9):e0162263 Authors: Portail M, Olu K, Dubois SF, Escobar-Briones E, Gelinas Y, Menot L, Sarrazin J

Article GUID: 27683216
Preservation of organic matter in marine sediments by inner-sphere interactions with reactive iron.

Author(s): Barber A, Brandes J, Leri A, Lalonde K, Balind K, Wirick S, Wang J, Gélinas Y

Sci Rep. 2017 03 23;7(1):366 Authors: Barber A, Brandes J, Leri A, Lalonde K, Balind K, Wirick S, Wang J, Gélinas Y

Article GUID: 28336935
Differences in Riverine and Pond Water Dissolved Organic Matter Composition and Sources in Canadian High Arctic Watersheds Affected by Active Layer Detachments.

Author(s): Wang JJ, Lafrenière MJ, Lamoureux SF, Simpson AJ, Gélinas Y, Simpson MJ

Environ Sci Technol. 2018 Feb 06;52(3):1062-1071 Authors: Wang JJ, Lafrenière MJ, Lamoureux SF, Simpson AJ, Gélinas Y, Simpson MJ

Article GUID: 29301070
Title:Preservation of organic matter in marine sediments by inner-sphere interactions with reactive iron.
Authors:Barber A,  Brandes J,  Leri A,  Lalonde K,  Balind K,  Wirick S,  Wang J,  Gélinas Y
Link:https://www.ncbi.nlm.nih.gov/pubmed/28336935?dopt=Abstract
Category:Sci Rep
PMID:28336935
Dept Affiliation: CHEMBIOCHEM
1 GEOTOP and the Department of Chemistry and Biochemistry, Concordia University, 7141 Sherbrooke West, Montréal, Quebec, H4B 1R6, Canada.
2 Skidaway Institute of Oceanography, University of Georgia, 10 Ocean Science Circle, Savannah, GA, 31411, USA.
3 Department of Natural Sciences, Marymount Manhattan College, 221 E 71st St., New York, New York, 10021, USA.
4 National Synchrotron Light Source, Brookhaven National Laboratory, Upton, NY, 11973, USA.
5 Canadian Light Source Inc, Saskatoon, Saskatchewan, S7N 0X4, Canada.
6 GEOTOP and the Department of Chemistry and Biochemistry, Concordia University, 7141 Sherbrooke West, Montréal, Quebec, H4B 1R6, Canada. yves.gelinas@concordia.ca.

Description:

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

Sci Rep. 2017 03 23;7(1):366

Authors: Barber A, Brandes J, Leri A, Lalonde K, Balind K, Wirick S, Wang J, Gélinas Y

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.

PMID: 28336935 [PubMed]