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Two Dimensional HETCOR Solid-State NMR Spectroscopy as a Tool to Improve our Understanding of the Chemical Alterations Caused by Charring of Humic Material

AuthorsKnicker, Heike ; Velasco Molina, Marta ; López-Martín, M. Carmen; Rosa Arranz, José M. de la ; Berns, Anne E.
KeywordsSoil organic matter
Pyrogenic organic matter
Black nitrogenn
Issue Date1-Sep-2014
PublisherInternational Humic Substances Society
Citation17th Meeting of the International Humic Substances Society - Natural Organic Matter: Structure-Dynamics-Innovative applications, Ioannina, (Greece) September 1-5 (2014) pp. 186-187
AbstractThe structure of pyrogenic organic matter (PyOM) is still a matter of controversial discussions. In order to obtain more detailed information 2-dimenstional (2D) 13C HETeronucleus CORelation (HETCOR) Nuclear Magnetic Resonance (NMR) spectroscopy was applied to model compounds, fire-affected and unaffected soils. Here, the C-signal intensity is modulated by the proton chemical shift via scalar coupling, which allows a more detailed correlation of protons to carbon groups. With those first experiments, we demonstrated the high potential of this technique for the study of complex organic samples. Our results supported the concept of PyOM being a heterogeneous mixture of partly thermally altered molecules, rather than a highly condensed polyaromatic network. For the first time, a 2D 15N HETCOR NMR spectrum of PyOM was acquired, evidencing that Black Nitrogen is indeed an integral part of the Black Carbon network and that some amide N groups can survive intense charring.
Publisher version (URL)http://ihss2014.org/
Appears in Collections:(IRNAS) Comunicaciones congresos
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