Characterization of humic acid fractions by C-13 nuclear magnetic resonance spectroscopy
Soil humic acids from different environments were fractionated by adsorption chromatography on Sephadex and characterized by C‐13 nuclear magnetic resonance (NMR) spectroscopy. The C‐13 NMR spectra of the fractions consist of some sharp, well‐resolved lines and some broad bands in contrast to the spectra of the unfractionated humic acids, where the bands are broader and less well‐resolved. The marked increase in resolution is apparently due to increased homogeneity of the fractions. These spectra are compared to the spectra of model compounds.
|Characterization of humic acid fractions by C-13 nuclear magnetic resonance spectroscopy
|Robert L. Wershaw, Kevin A. Thorn, D. J. Pinckney
|Environmental Technology Letters
|USGS Publications Warehouse
|National Research Program - Central Branch