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.
Suggested Citation
McKnight, D.M., Feder, G., Thurman, E.M., and Wershaw, R.L., 1983, Complexation of copper by aquatic humic substances from different environments: Science of the Total Environment, v. 28, no. 1-3, p. 65-76, https://doi.org/10.1016/S0048-9697(83)80008-4.
| 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 |