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Type: Journal article
Title: Background signal in solid state 13C NMR spectra of soil organic matter (SOM) - quantification and minimization
Author: Smernik, R.
Oades, J.
Citation: Solid State Nuclear Magnetic Resonance, 2001; 20(1-2):74-84
Publisher: Elsevier Science BV
Issue Date: 2001
ISSN: 0926-2040
Statement of
Ronald J. Smernik and J. Malcolm Oades
Abstract: 13C background signal, obtained for an empty rotor, was shown by spin counting experiments to be equivalent to 1 mg of observable carbon for cross-polarization (CP) spectra and 69 mg of observable C for Bloch decay (BD) spectra. The BD background was mainly due to Kel-F in the stator. with minimal signal detected from the Kel-F end-caps. The CP background was attributed to non-Kel-F components of the stator, probe, or probe supports. The BD background signal was eliminated by using a modified dipolar dephasing pulse sequence in which the absence of 19F decoupling (rather than the absence of 1H decoupling) causes selective elimination of the Kel-F signal.
Keywords: Carbon Isotopes; Soil; Magnetic Resonance Spectroscopy
Rights: Copyright © 2001 Academic Press. All rights reserved.
RMID: 0020010178
DOI: 10.1006/snmr.2001.0031
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Appears in Collections:Soil and Land Systems publications

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