Complexation of trace metals by adsorbed natural organic matter
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Abstract
The adsorption behavior and solution speciation of Cu(II) and Cd(II) were studied in model systems containing colloidal alumina particles and dissolved natural organic matter. At equilibrium a significant fraction of the alumina surface was covered by adsorbed organic matter. Cu(II) was partitioned primarily between the surface-bound organic matter and dissolved Cu-organic complexes in the aqueous phase. Complexation of Cu2+ with the functional groups of adsorbed organic matter was stronger than complexation with uncovered alumina surface hydroxyls. It is shown that the complexation of Cu(II) by adsorbed organic matter can be described by an apparent stability constant approximately equal to the value found for solution phase equilibria. In contrast, Cd(II) adsorption was not significantly affected by the presence of organic matter at the surface, due to weak complex formation with the organic ligands. The results demonstrate that general models of trace element partitioning in natural waters must consider the presence of adsorbed organic matter.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Complexation of trace metals by adsorbed natural organic matter |
| Series title | Geochimica et Cosmochimica Acta |
| DOI | 10.1016/0016-7037(84)90095-4 |
| Volume | 48 |
| Issue | 4 |
| Year Published | 1984 |
| Language | English |
| Publisher | Elsevier |
| Contributing office(s) | Toxic Substances Hydrology Program |
| Description | 13 p. |
| First page | 679 |
| Last page | 691 |
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