Humic acid complexation of calcium and copper

Journal Article · Mon Oct 01 00:00:00 EDT 1984 · Environ. Sci. Technol.; (United States)

OSTI ID:5985929

Hering, J G; Morel, F M.M.

High-affinity metal binding by isolated humic acids has been observed for both copper and calcium in metal titration experiments. Results of titration of humic acids with a single metal (either calcium or copper) are consistent with a discrete ligand site model of humate-metal binding. However, copper titrations in the presence of excess calcium do not show competitive effects predicted by such a model. Hence, different ligand sites must be involved in calcium and copper binding, or a binding mechanism other than discrete ligand binding must be operative.

• Research Organization: Massachusetts Institute of Technology, Cambridge (USA)
• OSTI ID: 5985929
• Journal Information: Environ. Sci. Technol.; (United States), Journal Name: Environ. Sci. Technol.; (United States) Vol. 22:10; ISSN ESTHA
• Country of Publication: United States
• Language: English

Related Subjects

520200* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ALKALINE EARTH METALS
CALCIUM
CHEMICAL REACTION KINETICS
CHEMISTRY
COPPER
ELEMENTS
HUMIC ACIDS
KINETICS
METALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
REACTION KINETICS
TRANSITION ELEMENTS
WATER CHEMISTRY