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Article << Previous     |         Contents Vol 11(4)

Analysis of soil organic matter at the solid–water interface by nuclear magnetic resonance spectroscopy

Stephanie C. Genest A , Myrna J. Simpson A B , André J. Simpson A , Ronald Soong A and David J. McNally A

A Environmental NMR Centre and Department of Physical and Environmental Sciences, University of Toronto, 1265 Military Trail, Toronto, ON, M1C 1A4, Canada.
B Corresponding author. Email: myrna.simpson@utoronto.ca

Environmental Chemistry 11(4) 472-482 http://dx.doi.org/10.1071/EN14060
Submitted: 19 March 2014  Accepted: 16 May 2014   Published: 30 July 2014


 
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Environmental context. Structural and conformational information on organic matter–clay complexes and whole soils was obtained using different NMR methods. The results show that organic matter interactions with clay mineral surfaces determine the accessibility of specific organic matter components at the soil–water interface. This physical conformation may also play a role in soil biogeochemical processes and binding to pollutants in terrestrial environments.

Abstract. Organic matter (OM)–mineral interactions play an important role in OM preservation, global carbon cycling and contaminant transport. Studies have indicated that preferential sorption of OM is dependent on mineral type and solution conditions. In this study, 1H high resolution–magic angle spinning nuclear magnetic resonance (HR-MAS NMR) spectroscopy was employed to examine OM chemistry in organo-clay complexes. Dissolved OM from a forest soil, Leonardite humic acid and Peat humic acid were sorbed to Ca2+ enriched kaolinite and montmorillonite. As observed using 1H HR-MAS NMR spectroscopy, kaolinite sorbed mainly long-chain aliphatic compounds such as those from plant cuticles whereas montmorillonite sorbed a mixture of aliphatic components and proteins. These results show the preferential sorption of specific dissolved OM components on clay surfaces. This was tested further using solid-state 13C and 1H HR-MAS NMR analysis of whole soils containing kaolinite and montmorillonite as well as a Peat soil for contrast. The species present at the soil–water interface were mainly aliphatic components, carbohydrates and amino acids. Aromatic constituents were present in the soils (observed by solid-state 13C NMR and by 1H HR-MAS NMR spectroscopy when a more penetrating solvent was used) which signifies that these compounds likely exist in more hydrophobic domains that are buried and surface inaccessible. This study highlights the important role of OM interactions with clay minerals in the preservation of OM in soils and suggests that OM–OM associations may also play a role in the protection of specific OM components in soil.

Additional keywords: 1H high-resolution magic angle spinning nuclear magnetic resonance spectroscopy, humin, kaolinite, montmorillonite, organic matter preservation, organic matter sorption, solid-state 13C nuclear magnetic resonance spectroscopy, solution-state 1H nuclear magnetic resonance spectroscopy.


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