Vapor-pressure osmometric study of the molecular weight and aggregation tendency of a reference-soil fulvic acid
Analytica Chimica Acta
By: J.A. Marinsky and M.M. Reddy
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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.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Vapor-pressure osmometric study of the molecular weight and aggregation tendency of a reference-soil fulvic acid |
| Series title | Analytica Chimica Acta |
| DOI | 10.1016/S0003-2670(00)81228-3 |
| Volume | 232 |
| Issue | 1 |
| Year Published | 1990 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Analytica Chimica Acta |
| First page | 123 |
| Last page | 130 |
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