Towards a mechanistic understanding of carbon stabilization in manganese oxides

Karen Johnson (), Graham Purvis, Elisa Lopez-Capel, Caroline Peacock, Neil Gray, Thomas Wagner, Christian März, Leon Bowen, Jesus Ojeda, Nina Finlay, Steve Robertson, Fred Worrall and Chris Greenwell
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Karen Johnson: School of Engineering and Computing Sciences, Durham University
Graham Purvis: School of Civil Engineering and Geosciences, Devonshire Walk, Newcastle University
Elisa Lopez-Capel: School of Agriculture, Food and Rural Development, Newcastle University
Caroline Peacock: Earth Surface Science Institute, School of Earth and Environmental Sciences, University of Leeds
Neil Gray: School of Civil Engineering and Geosciences, Devonshire Walk, Newcastle University
Thomas Wagner: School of Civil Engineering and Geosciences, Devonshire Walk, Newcastle University
Christian März: School of Civil Engineering and Geosciences, Devonshire Walk, Newcastle University
Leon Bowen: Durham University
Jesus Ojeda: Experimental Techniques Centre, Institute of Materials and Manufacturing, Brunel University
Nina Finlay: School of Engineering and Computing Sciences, Durham University
Steve Robertson: School of Engineering and Computing Sciences, Durham University
Fred Worrall: Durham University
Chris Greenwell: Durham University

Nature Communications, 2015, vol. 6, issue 1, 1-11

Abstract: Abstract 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 thermogravimetric methods, we identify two main OC fractions. One is thermally refractory (>550 °C) and the other is thermally more labile (

Date: 2015
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DOI: 10.1038/ncomms8628

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