Anaerobic microbial remobilization of toxic metals coprecipitated with iron oxide
- Brookhaven National Lab., Upton, NY (USA)
An anaerobic N{sub 2}-fixing Clostridium sp. solubilized Cd, Cr, Ni, Pb, and Zn coprecipitated with goethite ({alpha}-FeOOH) by (i) direct action due to enzymatic reduction of ferric iron and the release of metals associated with iron and (ii) indirect action due to metabolic products. The extent of dissolution depended upon the nature of the association of the metals with goethite. Substantial amounts of Cd and Zn, which were closely associated with iron, were released due to direct action. Nickel was solubilized by direct and indirect actions, while a small amount of Cr was solubilized only by direct action. The nature of association of Pb in the coprecipitate was not affected by the presence of other cations and it was solubilized by indirect action. In the presence of bacteria, the concentration of soluble Pb decreased due to biosorption. These results show that there could be significant remobilization of toxic metals coprecipitated with iron oxides in wastes, contaminated soils, and sediments due to microbial iron reduction.
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 5466663
- Journal Information:
- Environmental Science and Technology; (United States), Vol. 24:3; ISSN 0013-936X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Anaerobic microbial remobilization of coprecipitated metals
Anaerobic microbial remobilization of coprecipitated metals
Related Subjects
HAZARDOUS MATERIALS
COPRECIPITATION
ANAEROBIC CONDITIONS
BIODEGRADATION
CADMIUM
CHROMIUM
GOETHITE
IRON OXIDES
LEAD
MICROORGANISMS
NICKEL
ZINC
CHALCOGENIDES
CHEMICAL REACTIONS
DECOMPOSITION
ELEMENTS
IRON COMPOUNDS
MATERIALS
METALS
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PRECIPITATION
SEPARATION PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
540220* - Environment
Terrestrial- Chemicals Monitoring & Transport- (1990-)