| Abstract: | The molecular weight and aggregation tendency of a reference-soil fulvic acid in Armadale horizon Bh were determined by vapor-pressure osmometry using tetrahydrofuran and water as solvents. With tetrahydrofuran, number-average molecular weight values of 767 ?? 34 and 699 ?? 8 daltons were obtained from two separate sets of measurements. Two sets of measurements with water also yielded values within this range (754 ?? 70 daltons) provided that the fulvic acid concentration in water did not exceed 7 mg ml-1; at higher concentrations (9.1-13.7 mg ml-1) a number-average molecular weight of 956 ?? 25 daltons was resolved, providing evidence of molecular aggregation. Extension of these studies to 80% neutralized fulvic acid showed that a sizeable fraction of the sodium counter ion is not osmotically active. |
| Genre: | Article |
| ProdID: | 70016129 |
| Citation Author: | Marinsky, J. A.; Reddy, M. M. |
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| Citation End Page: | 130 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Analytica Chimica Acta |
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| Citation Number Of Pages: | 8 |
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| Citation Search Results Text: | Vapor-pressure osmometric study of the molecular weight and aggregation tendency of a reference-soil fulvic acid; 1990; Article; Journal; Analytica Chimica Acta; Marinsky, J. A.; Reddy, M. M. |
| Citation Start Page: | 123 |
| Citation Volume: | 232 |
| Citation Year: | 1990 |
| Type: | citation/reference |
| Text: | Vapor-pressure osmometric study of the molecular weight and aggregation tendency of a reference-soil fulvic acid; 1990; Article; Journal; Analytica Chimica Acta; Marinsky, J. A.; Reddy, M. M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/S0003-2670(00)81228-3 |
| Date Other: | Mon, 1 Jan 1990 00:00 -0600 |
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