Copper binding by dissolved organic matter. II. Variation in type and source of organic matter
Copper binding properties of several fulvic acid (FA) and whole water samples are compared by means of an empirical model that was calibrated using Suwannee River FA. Within the calibration limits of the model (pH 5.0-8.5, total Cu concentration 0.1-100 ..mu..M, ionic strength 0.1, and dissolved organic carbon, DOC, 1-10 mg C/1), pCu in solutions of a variety of FA samples are predicted with < 0.2 pCu units root mean square error (RMSE). Within the calibration limits, many whole water sample pCu's are predicted with < 0.3 pCu units RMSE if only one-half of the dissolved organic carbon is assumed to bind Cu. Agreement between prediction and experiment at lower ionic strength is not as good. Variations in Cu binding among different sources of dissolved organic matter appear to be much smaller than those due to chemical factors such as pH and ionic strength.
- Research Organization:
- Univ. of North Carolina, Chapel Hill (USA)
- OSTI ID:
- 6996702
- Journal Information:
- Geochim. Cosmochim. Acta; (United States), Journal Name: Geochim. Cosmochim. Acta; (United States) Vol. 52:1; ISSN GCACA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
580400* -- Geochemistry-- (-1989)
CARBON IONS
CHARGED PARTICLES
CHEMICAL BONDS
CHEMICAL COMPOSITION
CHEMISTRY
COPPER IONS
DISSOLVED GASES
ELEMENTS
FLUIDS
FULVIC ACIDS
GASES
GEOCHEMISTRY
IONS
MATHEMATICAL MODELS
MOLECULAR MODELS
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC MATTER
OXYGEN
PH VALUE
RIVERS
SOLUTES
STREAMS
SURFACE WATERS