Physicochemical and mineralogical characterization of soil-saprolite cores from a field research site, Tennessee.
J Environ Qual
; 35(5): 1731-41, 2006.
Article
en En
| MEDLINE
| ID: mdl-16899744
ABSTRACT
Site characterization is an essential initial step in determining the feasibility of remedial alternatives at hazardous waste sites. Physicochemical and mineralogical characterization of U-contaminated soils in deeply weathered saprolite at Area 2 of the DOE Field Research Center (FRC) site, Oak Ridge, TN, was accomplished to examine the feasibility of bioremediation. Concentrations of U in soil-saprolite (up to 291 mg kg(-1) in oxalate-extractable U(o)) were closely related to low pH (ca. 4-5), high effective cation exchange capacity without Ca (64.7-83.2 cmol(c) kg(-1)), amorphous Mn content (up to 9910 mg kg(-1)), and the decreased presence of relative clay mineral contents in the bulk samples (i.e., illite 2.5-12 wt. %, average 32 wt. %). The pH of the fill material ranged from 7.0 to 10.5, whereas the pH of the saprolite ranged from 4.5 to 8. Uranium concentration was highest (about 300 mg kg(-1)) at around 6 m below land surface near the saprolite-fill interface. The pH of ground water at Area 2 tended to be between 6 and 7 with U concentrations of about 0.9 to 1.7 mg L(-1). These site specific characteristics of Area 2, which has lower U and nitrate contamination levels and more neutral ground water pH compared with FRC Areas 1 and 3 (ca. 5.5 and <4, respectively), indicate that with appropriate addition of electron donors and nutrients bioremediation of U by metal reducing microorganisms may be possible.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Suelo
/
Microbiología del Suelo
/
Contaminantes Radiactivos del Suelo
/
Contaminantes Radiactivos del Agua
/
Monitoreo del Ambiente
/
Uranio
Tipo de estudio:
Diagnostic_studies
/
Evaluation_studies
País/Región como asunto:
America do norte
Idioma:
En
Revista:
J Environ Qual
Año:
2006
Tipo del documento:
Article
País de afiliación:
Estados Unidos