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Data from: Towards a mechanistic understanding of carbon stabilization in manganese oxides. Open Access

Abstract form article: Minerals stabilize organic carbon (OC) in sediments, thereby directly affecting global climate at multiple scales, but how they do it is far from understood. Here we show that manganese oxide (Mn oxide) in a water treatment works filter bed traps dissolved OC as coatings build up in layers around clean sand grains at 3%w/wC. Using spectroscopic and thermogravi- metric methods, we identify two main OC fractions. One is thermally refractory (>550 °C) and the other is thermally more labile (<550 °C). We postulate that the thermal stability of the trapped OC is due to carboxylate groups within it bonding to Mn oxide surfaces coupled with physical entrapment within the layers. We identify a significant difference in the nature of the surface-bound OC and bulk OC . We speculate that polymerization reactions may be occurring at depth within the layers. We also propose that these processes must be considered in future studies of OC in natural systems.

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Resource type
Dataset
Contributors
Creator: Johnson, Karen 1
Contact person: Johnson, Karen 1
Creator: Purvis, Graham 2
Creator: Lopez-Capel, Elisa 2
Creator: Ojeda, Jesus 3
1 Durham University, UK
2 Newcastle University, UK
3 Brunel University, UK
Funder
EPSRC
Research methods
Other description
Minerals are known to stabilise organic carbon in sediments, affecting biogeochemical cycles and global climate, but the mechanism is not understood. Here, the authors suggest that manganese oxides can trap organic carbon and may act as a 'mineral pump', transforming carbon between labile and refractory forms.
Keyword
minerals
Micro-FTIR images
XPS spectral analysis
carbon stabilisation
TGA spectral analysis
manganese oxide
Subject
Location
Language
Cited in
doi:10.1038/ncomms8628
Identifier
ark:/32150/br86b364d
doi:10.15128/br86b364d
Rights
All rights reserved All rights reserved
Publisher
Durham University
Date Created
2015-06-29T16:28:00.000+00:00

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S. Palucha
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20 July 2017, 12:07:44
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