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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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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

File Details

Depositor

S. Palucha

Date Uploaded

12 October 2015, 14:10:14

Date Modified

20 July 2017, 12:07:44

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File format: zip (ZIP Format)

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File size: 1816153

Last modified: 2017:07:20 12:25:40+01:00

Filename: br86b364d.zip

Original checksum: 43f21aa25bf3ca0e43a81019097e7334