Bulletin of Experimental Biology and Medicine.
New York Consultants BureauSpringer / Автономная некоммерческая организация Издательство Российской академии медицинских наук.
Vol. 136.
2003.
P. 380-384
The fragment composition of humic acids was studied by quantitative C-13 NMR spectroscopy. A comparative analysis of the chemical composition of humic acids extracted from organic matter of different origin was performed. A number of structural parameters determined from the C-13 NMR spectra was proposed for the classification of humic acids by origin.