Isolation of hydrophilic organic acids from water using nonionic macroporous resins

Organic Geochemistry
By: , and 

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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.

Additional publication details

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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