Journal
NATURE COMMUNICATIONS
Volume 6, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms8628
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Funding
- UK Engineering and Physical Sciences Research Council [EP/G028958/1]
- Leverhulme Trust
- Engineering and Physical Sciences Research Council [EP/G028958/1, EP/E044670/1] Funding Source: researchfish
- EPSRC [EP/E044670/1, EP/G028958/1] Funding Source: UKRI
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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 degrees C) and the other is thermally more labile (<550 degrees 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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