Document Detail

Removal of depleted uranium from contaminated soils.
MedLine Citation:
PMID:  16386369     Owner:  NLM     Status:  MEDLINE    
Contamination of soil and water with depleted uranium (DU) has increased public health concerns due to the chemical toxicity of DU at elevated dosages. For this reason, there is great interest in developing methods for DU removal from contaminated sources. Two DU laden soils, taken from U.S. Army sites, were characterized for particle size distribution, total uranium concentration and removable uranium. Soil A was found to be a well graded sand containing a total of 3210 mg/kg DU (3.99 x 10(4) Bq/kg, where a Becquerel (Bq) is a unit of radiation). About 83% of the DU in the fines fraction (particle diameter <0.075 mm, total DU 7732 mg/kg (9.61 x 10(4) Bq/kg)) was associated with the carbonate, iron and manganese oxide and organic matter fractions of the material. Soil B was classified as a sandy silt with total DU of 1560 mg/kg (1.94 x 10(4) Bq/kg). The DU content in the fines fraction was 5171 mg/kg (6.43 x 10(4) Bq/kg). Sequential extraction of the Soil B fines fraction indicated that 64% of the DU was present either as soluble U(VI) minerals or as insoluble U(IV). Citric acid, sodium bicarbonate and hydrogen peroxide were used in batch experiments to extract DU from the fines fraction of both soils. Citric acid and sodium bicarbonate were relatively successful for Soil A (50-60% DU removal), but not for Soil B (20-35% DU removal). Hydrogen peroxide was found to significantly increase DU extraction from both soils, attaining removals up to 60-80%.
Christine Chin Choy; George P Korfiatis; Xiaoguang Meng
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2005-12-28
Journal Detail:
Title:  Journal of hazardous materials     Volume:  136     ISSN:  0304-3894     ISO Abbreviation:  J. Hazard. Mater.     Publication Date:  2006 Aug 
Date Detail:
Created Date:  2006-06-13     Completed Date:  2006-11-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9422688     Medline TA:  J Hazard Mater     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  53-60     Citation Subset:  IM    
Center for Environmental Systems, Stevens Institute of Technology, Castle Point-on-Hudson, Hoboken, NJ 07030, USA.
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MeSH Terms
Citric Acid / chemistry
Hydrogen-Ion Concentration
Sodium Bicarbonate / chemistry
Soil Pollutants / isolation & purification*
Uranium / chemistry*,  isolation & purification*
Reg. No./Substance:
0/Soil Pollutants; 144-55-8/Sodium Bicarbonate; 7440-61-1/Uranium; 77-92-9/Citric Acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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