The influence of humic acid on the biological effects of selected trace metals
Thesis/Dissertation
·
OSTI ID:7243149
The influence of humic acid (HA) on the biological effects of cadmium, hexavalent chromium, and two forms of trivalent chromium was assessed using common freshwater invertebrates. The acute toxicity was determined using Daphnia pulex, while D. magna was used in bioaccumulation studies. Final concentrations of HA tested were 0, 0.5, 5, and 50 mg/l. Humic acid was observed to significantly increase, decrease, or not influence both the acute toxicity and bioaccumulation of cadmium depending on HA concentration and time point examined. Additionally, dialysis studies were used to determine the influence of HA on the bioavailability of the metals. As with the biological effects, HA had little influence on the bioavailability of hexavalent chromium, while having a greater influence on cadmium and chromic chloride. There was a HA concentration dependent pattern of binding (a maximal decrease in percent free metal followed by metal release from HA) observed with cadmium and chromic chloride. This metal release from HA may have resulted from an associated time dependent decrease in pH of the surrounding water. Humic acid had little influence on the bioavailability of chrome lignosulfonate.
- Research Organization:
- Northeast Louisiana Univ., Monroe, LA (USA)
- OSTI ID:
- 7243149
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
560300* -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANIMALS
AQUATIC ORGANISMS
ARTHROPODS
BIOLOGICAL ACCUMULATION
BIOLOGICAL AVAILABILITY
BIOLOGICAL EFFECTS
BRANCHIOPODS
CADMIUM
CHROMIUM
CRUSTACEANS
DAPHNIA
ELEMENTS
HUMIC ACIDS
INVERTEBRATES
METALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
TIME DEPENDENCE
TOXICITY
TRACE AMOUNTS
TRANSITION ELEMENTS
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANIMALS
AQUATIC ORGANISMS
ARTHROPODS
BIOLOGICAL ACCUMULATION
BIOLOGICAL AVAILABILITY
BIOLOGICAL EFFECTS
BRANCHIOPODS
CADMIUM
CHROMIUM
CRUSTACEANS
DAPHNIA
ELEMENTS
HUMIC ACIDS
INVERTEBRATES
METALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
TIME DEPENDENCE
TOXICITY
TRACE AMOUNTS
TRANSITION ELEMENTS