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Formation of Heteroaromatic Nitrogen after Prolonged Humification of Vascular Plant Remains as Revealed by Nuclear Magnetic Resonance Spectroscopy

H. Knicker*,a, P.G. Hatcherb and F.J. González-Vilac

a Lehrstuhl für Bodenkunde, Technische Universität München, 85350 Freising-Weihenstephan, Germany
b Department of Chemistry, The Ohio State University, Columbus, OH 43210
c Instituto de Recursos Naturales y Agrobiología, C.S.I.C., P.O. Box 1052, 41080 Sevilla, Spain



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  		Fig. 1. Cross polarization magic angle spinning (CPMAS) 13C and 15N nuclear magnetic resonance (NMR) spectra of two layers of the Torreblanca (Spain) peat in comparison with those obtained from fresh ryegrass (Lolium perenne L.) material (Knicker et al., 1996b). Asterisks indicate spinning side bands.

 


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  		Fig. 2. Cross polarization magic angle spinning (CPMAS) 15N nuclear magnetic resonance (NMR) spectra of the peat from Mangrove Lake, Bermuda.

 


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  		Fig. 3. Cross polarization magic angle spinning (CPMAS) 13C and 15N nuclear magnetic resonance (NMR) spectra of the peat from the Padul Turba deposit and the lignite from the Arenas del Rey deposit.

 


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  		Fig. 4. Cross polarization magic angle spinning (CPMAS) 13C and CPMAS 15N nuclear magnetic resonance (NMR) spectra of two coals.

 




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