Complexation of copper by aquatic humic substances from different environments
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Abstract
The copper-complexing properties of aquatic humic substances isolated from eighteen different environments were characterized by potentiometric titration, using a cupric ion selective electrode. Potentiometric data were analyzed using FITEQL, a computer program for the determination of chemical equilibrium constants from experimental data. All the aquatic humic substances could be modelled as having two types of Cu(II)-binding sites: one with K equal to about 106 and a concentration of 1.0 ± 0.4 × 10−6 M(mg C)−1 and another with K equal to about 108 and a concentration of 2.6 ± 1.6 × 10−7 M(mg C)−1.
A method is described for estimating the Cu(II)-binding sites associated with dissolved humic substances in natural water based on a measurement of dissolved organic carbon, which may be helpful in evaluating chemical processes controlling speciation of Cu and bioavailability of Cu to aquatic organisms.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Complexation of copper by aquatic humic substances from different environments |
| Series title | Science of the Total Environment |
| DOI | 10.1016/S0048-9697(83)80008-4 |
| Volume | 28 |
| Issue | 1-3 |
| Year Published | 1983 |
| Language | English |
| Publisher | Elsevier |
| Contributing office(s) | Toxic Substances Hydrology Program |
| Description | 12 p. |
| First page | 65 |
| Last page | 76 |
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