| Abstract: | The molecular weights of aquatic fulvic acids extracted from five rivers were determined by vapor pressure osmometry with water and tetrahydrofuran as solvents. The values obtained ranged from 500 to 950 dallons, indicating that the molecular weights of aquatic fulvic acids are not as great as has been suggested in some other molecular weight studies. The samples were shown to be relatively monodisperse from radii of gyration measurements determined by small angle x-ray scattering. THF affords greater precision and accuracy than H2O in VPO measurements, and was found to be a suitable solvent for the determination of molecular weight of aquatic fulvic acid because it obviates the dissociation problem. An inverse correlation was observed with these samples between the concentration of Ca++ and Mg++ in the river water and the radii of gyration and molecular weights of the corresponding fulvic acid samples. ?? 1987. |
| Genre: | Article |
| ProdID: | 70014182 |
| Citation Author: | Aiken, G. R.; Malcolm, R. L. |
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| Citation End Page: | 2184 |
| Citation Issue: | 8 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geochimica et Cosmochimica Acta |
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| Citation Number Of Pages: | 8 |
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| Citation Search Results Text: | Molecular weight of aquatic fulvic acids by vapor pressure osmometry; 1987; Article; Journal; Geochimica et Cosmochimica Acta; Aiken, G. R.; Malcolm, R. L. |
| Citation Start Page: | 2177 |
| Citation Volume: | 51 |
| Citation Year: | 1987 |
| Type: | citation/reference |
| Text: | Molecular weight of aquatic fulvic acids by vapor pressure osmometry; 1987; Article; Journal; Geochimica et Cosmochimica Acta; Aiken, G. R.; Malcolm, R. L. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Thu, 1 Jan 1987 00:00 -0600 |
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