Effect of organic matter applications on 13C-NMR spectra of humic acids of soil
β Scribed by S. Dou; J. J. Zhang; K. Li
- Book ID
- 108718651
- Publisher
- John Wiley and Sons
- Year
- 2008
- Tongue
- English
- Weight
- 253 KB
- Volume
- 59
- Category
- Article
- ISSN
- 1351-0754
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π SIMILAR VOLUMES
## Abstract The ^13^C NMR spectra of a number of derivatives of the cyclic acylal of malonic acid and of dimethylbarbituric acid are reported. These compounds contain an electron poor polarized carbon β carbon double bond and act therefore, as Lewis acids.
13 C 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