| Abstract: | Intensity distortions and poor signal to noise in the cross-polarization magic-angle sample spinning NMR of fulvic acids were investigated and attributed to molecular mobility in these ostensibly "solid" materials. We have shown that inefficiencies in cross polarization can be overcome by lowering the sample temperature to about -60??C. These difficulties can be generalized to many other synthetic and natural products. The use of variable temperature and cross-polarization intensity as a function of contact time can yield valuable qualitative information which can aid in the characterization of many materials. ?? 1987. |
| Genre: | Article |
| ProdID: | 70014266 |
| Citation Author: | Earl, W. L.; Wershaw, R. L.; Thorn, K. A. |
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| Citation End Page: | 274 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Magnetic Resonance |
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| Citation Number Of Pages: | 11 |
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| Citation Search Results Text: | The use of variable temperature and magic-angle sample spinning in studies of fulvic acids; 1987; Article; Journal; Journal of Magnetic Resonance; Earl, W. L.; Wershaw, R. L.; Thorn, K. A. |
| Citation Start Page: | 264 |
| Citation Volume: | 74 |
| Citation Year: | 1987 |
| Type: | citation/reference |
| Text: | The use of variable temperature and magic-angle sample spinning in studies of fulvic acids; 1987; Article; Journal; Journal of Magnetic Resonance; Earl, W. L.; Wershaw, R. L.; Thorn, K. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/0022-2364(87)90337-4 |
| Date Other: | Thu, 1 Jan 1987 00:00 -0600 |
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