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Does Solid-state 15N NMR Spectroscopy Detect all Soil Organic Nitrogen?

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Abstract

Virtually all of the N detected by 15N cross polarization (CP) NMR spectra of four HF-treated soil clay fractions is amide N. However, the intensity of this 15N CP NMR signal (per unit N) is 27–57% lower than detected for a wheat protein, gliadin. There are two possible explanations – either the amide N in the soil clay fractions produces proportionately less NMR signal than does the amide N in gliadin, or part of the N in the soil clay fractions produces little or no NMR signal. The cross polarization dynamics of the gliadin amide resonance and amide resonances detected for the soil clay fractions are very similar and thus should produce similar amounts of signal, ruling out the first possibility. Therefore up to half or even more of the organic N in these soil clay fractions must be in a form that is insensitive to NMR detection. For a model compound (caffeine), non-protonated heterocyclic N produced less than 20% of the signal of an equivalent amount of amide N in gliadin. Results from several 13C NMR techniques provide further evidence that much of the undetected N in the soil clay fractions may be heterocyclic.

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  1. Soil and Land Systems, School of Earth and Environmental Sciences, The University of Adelaide, Waite Campus, Urrbrae, SA, 5064, Australia

    Ronald J. Smernik

  2. CSIRO Land and Water, PMB 2, Glen Osmond, SA, 5064, Australia

    Jeffrey A. Baldock

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Smernik, R.J., Baldock, J.A. Does Solid-state 15N NMR Spectroscopy Detect all Soil Organic Nitrogen?. Biogeochemistry 75, 507–528 (2005). https://doi.org/10.1007/s10533-005-2857-8

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