3C-NMR structural features of soil humic acids and their methylated, hydrolyzed and extracted derivatives
作者： F.J. Gonzalez-Vila , H.-D. Lüdemann , F. Martin
DOI: 10.1016/0016-7061(83)90080-0
关键词:
摘要: Abstract 13C-NMR spectra of aqueous solutions three humic acids (1 Typic Chromoxerert (HA-V), 1 Humic Haplorthod (HA-P), and Inceptisol (HA-D)) are presented. The influence chemical modifications (hydrolysis with 6N HCl, diazomethane methylation, organic solvent extraction) the substances their is studied. various show significant differences. Methylation compounds introduces changes in aromatic aliphatic (sp3) region spectra. Acid hydrolysis removes residual carbohydrates amino acid signals from spectra, whereas extraction has most pronounced upon high field shows also, that a amount paraffinic carbons bound covalently to nuclei compounds.
harvard.edu
elsevier.com
sci-hub.se 参考文章(37)
M.V. Cheshire, P.A. Cranwell, C.P. Falshaw, A.J. Floyd, R.D. Haworth, Humic acid—II Tetrahedron. ,vol. 23, pp. 1669- 1682 ,(1967) , 10.1016/S0040-4020(01)82565-5
J. B. Stothers, Carbon-13 NMR spectroscopy Academic Press. ,(1972)
Francisco Javier González-Vila, Francisco Martín Martínez, L'oxydation au persulfate des acides humiques du sol Institut national de la recherche agronomique (France). ,(1981)
Shahamat U. Khan, M. Schnitzer, Humic substances in the environment M. Dekker. ,(1972)
Patrick G. Hatcher, Gary E. Maciel, Larry W. Dennis, Aliphatic structure of humic acids; a clue to their origin Organic Geochemistry. ,vol. 3, pp. 43- 48 ,(1981) , 10.1016/0146-6380(81)90012-7
M.A. Wilson, K.M. Goh, Comment on the paper: “[1H] and [13C]NMR studies on the importance of aromatic structures in fulvic and humic acids” (Ruggieroet al., 1979) Geochimica et Cosmochimica Acta. ,vol. 45, pp. 489- 490 ,(1981) , 10.1016/0016-7037(81)90256-8
DAVID GRANT, Chemical structure of humic substances Nature. ,vol. 270, pp. 709- 710 ,(1977) , 10.1038/270709A0
D VANDERHART, H RETCOFSKY, Estimation of coal aromaticities by proton-decoupled carbon-13 magnetic resonance spectra of whole coals Fuel. ,vol. 55, pp. 202- 204 ,(1976) , 10.1016/0016-2361(76)90088-0
R. L. WERSHAW, D. J. PINCKNEY, Methylation of humic Acid fractions. Science. ,vol. 199, pp. 906- 907 ,(1978) , 10.1126/SCIENCE.199.4331.906
C. E. Snape, C. A. Smith, K. D. Bartle, R. S. Matthews, Estimation of oxygen group concentrations in coal extracts by nuclear magnetic resonance spectrometry Analytical Chemistry. ,vol. 54, pp. 20- 25 ,(1982) , 10.1021/AC00238A009