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Comparison of solid-state 13C NMR spectra of soil organic matter from an experimental burning site acquired at two field strengths


Smernik, R J; Eckmeier, E; Schmidt, M W I (2008). Comparison of solid-state 13C NMR spectra of soil organic matter from an experimental burning site acquired at two field strengths. Australian Journal of Soil Research, 46(2):122-127.

Abstract

Solid-state 13C cross polarisation (CP) nuclear magnetic resonance spectra were acquired for 15 soil organic matter samples on 2 different spectrometers (200MHz and 400 MHz). Distributions of broad functional group classes—carboxyl, aryl, O-alkyl, and alkyl—were determined by integration across broad chemical shift regions. The distributions derived from the 2 spectrometers were closely correlated (r2 = 0.77–0.93). Only slight biases were identified;
carboxyl C contents were on average 8% lower and alkyl C contents 5% higher for spectra acquired on the 400MHz
spectrometer. These results indicate that valid 13C CP spectra can be acquired at field strengths up to 400 MHz, and that spectra acquired at different field strengths can be directly comparable.

Abstract

Solid-state 13C cross polarisation (CP) nuclear magnetic resonance spectra were acquired for 15 soil organic matter samples on 2 different spectrometers (200MHz and 400 MHz). Distributions of broad functional group classes—carboxyl, aryl, O-alkyl, and alkyl—were determined by integration across broad chemical shift regions. The distributions derived from the 2 spectrometers were closely correlated (r2 = 0.77–0.93). Only slight biases were identified;
carboxyl C contents were on average 8% lower and alkyl C contents 5% higher for spectra acquired on the 400MHz
spectrometer. These results indicate that valid 13C CP spectra can be acquired at field strengths up to 400 MHz, and that spectra acquired at different field strengths can be directly comparable.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Geography
Dewey Decimal Classification:910 Geography & travel
Uncontrolled Keywords:soil organic matter, cross polarization, solid-state 13C NMR.
Language:English
Date:18 March 2008
Deposited On:23 Oct 2008 14:10
Last Modified:21 Nov 2017 13:34
Publisher:CSIRO
ISSN:0004-9573
Publisher DOI:https://doi.org/10.1071/SR07128

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