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

November 1, 1982

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.

Citation Information

Publication Year 1982
Title Adsorption of natural dissolved organic matter at the oxide/water interface
DOI 10.1016/0016-7037(82)90209-5
Authors James A. Davis
Publication Type Article
Publication Subtype Journal Article
Series Title Geochimica et Cosmochimica Acta
Series Number
Index ID 70185624
Record Source USGS Publications Warehouse
USGS Organization Toxic Substances Hydrology Program