Adsorption of natural dissolved organic matter at the oxide/water interface

Geochimica et Cosmochimica Acta
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Abstract

Natural organic matter is readily adsorbed by alumina and kaolinite in the pH range of natural waters. Adsorption occurs by complex formation between surface hydroxyls and the acidic functional groups of the organic matter. Oxides with relatively acidic surface hydroxyls, e.g. silica, do not react strongly with the organic matter. Under conditions typical for natural waters, almost complete surface coverage by adsorbed organic matter may be expected for alumina, hydrous iron oxides and the edge sites of aluminosilicates. Potentiometric titration and electrophoresis indicate that most of the acidic functional groups of the adsorbed organic matter are neutralized by protons from solution. The organic coating is expected to have a great influence on subsequent adsorption of inorganic cations and anions.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Adsorption of natural dissolved organic matter at the oxide/water interface
Series title Geochimica et Cosmochimica Acta
DOI 10.1016/0016-7037(82)90209-5
Volume 46
Issue 11
Year Published 1982
Language English
Publisher Elsevier
Contributing office(s) Toxic Substances Hydrology Program
Description 13 p.
First page 2381
Last page 2393