Isolation of hydrophilic organic acids from water using nonionic macroporous resins
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Abstract
A method has been developed for the isolation of hydrophilic organic acids from aquatic environments using Amberlite∗ XAD-4 resin. The method uses a two column array of XAD-8 and XAD-4 resins in series. The hydrophobic organic acids, composed primarily of aquatic fulvic acid, are removed from the sample on XAD-8, followed by the isolation of the more hydrophilic organic acids on XAD-4. For samples from a number of diverse environments, more of the dissolved organic carbon was isolated on the XAD-8 resin (23–58%) than on the XAD-4 resin (7–25%). For these samples, the hydrophilic acids have lower carbon and hydrogen contents, higher oxygen and nitrogen contents, and are lower in molecular weight than the corresponding fulvic acids. 13C NMR analyses indicate that the hydrophilic acids have a lower concentration of aromatic carbon and greater heteroaliphatic, ketone and carboxyl content than the fulvic acid.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Isolation of hydrophilic organic acids from water using nonionic macroporous resins |
| Series title | Organic Geochemistry |
| DOI | 10.1016/0146-6380(92)90119-I |
| Volume | 18 |
| Issue | 4 |
| Year Published | 1992 |
| Language | English |
| Publisher | Elsevier |
| Contributing office(s) | Toxic Substances Hydrology Program |
| Description | 7 p. |
| First page | 567 |
| Last page | 573 |
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