Fulvic acid: modifier of metal-ion chemistry
Fulvic acid, which is derived from the decay of plants and animals, is being studied for its role in the transport and toxicity of metal ions in soil and water. It is discussed in relation to the origin of humic substances and its interactions with metal ions. Techniques for investigating complexes of fulvic acid and metal ions are presented. They are separation and nonseparation analyses which are applied to speciation problems. The applicability, advantages, and disadvantages of both methods are presented. Separation of free and complexed metal ions can be done by chromatography, or with membranes that exclude the metal-ion complexes. Chromatographic techniques include liquid chromatography by size exclusion. Nonseparation techniques include voltametry and potentiometry, as well as fluorescence. A comparison of methods for calculation of the conditional stability constant K for complexes containing fulvic acid and copper (II) or cadmium (II) is presented.
- Research Organization:
- Geraghty and Miller, Inc., Syosset, NY
- OSTI ID:
- 6750346
- Journal Information:
- Environ. Sci. Technol.; (United States), Journal Name: Environ. Sci. Technol.; (United States) Vol. 16:9; ISSN ESTHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
520200 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AVAILABILITY
CADMIUM COMPOUNDS
CATIONS
CHARGED PARTICLES
CHEMISTRY
CHROMATOGRAPHY
COMPLEXES
COPPER COMPOUNDS
ENVIRONMENTAL TRANSPORT
FULVIC ACIDS
HYDROGEN COMPOUNDS
INTERACTIONS
IONS
MASS TRANSFER
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
POTENTIOMETRY
SEPARATION PROCESSES
SOIL CHEMISTRY
SOILS
TITRATION
TOXICITY
TRANSITION ELEMENT COMPOUNDS
VOLTAMETRY
WATER