| Abstract: | 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. |
| Genre: | Article |
| ProdID: | 70014847 |
| Citation Author: | Wershaw, R. L.; Thorn, K. A.; Pinckney, D. J. |
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| Citation End Page: | 62 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Environmental Technology Letters |
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| Citation Number Of Pages: | 10 |
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| Citation Search Results Text: | Characterization of humic acid fractions by C-13 nuclear magnetic resonance spectroscopy; 1988; Article; Journal; Environmental Technology Letters; Wershaw, R. L.; Thorn, K. A.; Pinckney, D. J. |
| Citation Start Page: | 53 |
| Citation Volume: | 9 |
| Citation Year: | 1988 |
| Type: | citation/reference |
| Text: | Characterization of humic acid fractions by C-13 nuclear magnetic resonance spectroscopy; 1988; Article; Journal; Environmental Technology Letters; Wershaw, R. L.; Thorn, K. A.; Pinckney, D. J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Fri, 1 Jan 1988 00:00 -0600 |
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