Document Detail

No measurable changes in 238U/235U due to desorption-adsorption of U(VI) from groundwater at the Rifle, Colorado IFRC site.
MedLine Citation:
PMID:  23379698     Owner:  NLM     Status:  Publisher    
Groundwater samples were collected from the Integrated Field Research Challenge field site in Rifle, CO over the course of a bicarbonate-induced U desorption-adsorption experiment. Uranium concentrations and high precision U isotopic compositions (238U/235U) of these groundwater samples were determined and used to assess the impact of bicarbonate-induced U(VI) desorption from contaminated sediments on the 238U/235U of groundwater. The 238U/235U of groundwater was not significantly impacted by bicarbonate-induced desorption of U(VI) from mineral surfaces, nor by adsorption of advecting U(VI) from upgradient locations onto those surfaces after the treatment. Assuming this absence of a significant shift in U isotopic composition associated with desorption-adsorption applies to other systems, reduction of U(VI) to U(IV) is expected to be the dominant source of U isotopic fractionation associated with removal of U(VI) from pore water as a result of natural and stimulated reductive pathways. Thus, changes in the 238U/235U composition of uranium-bearing fluids should be useful in quantifying the extent of reduction.
Alyssa E Shiel; Parker G Laubach; Thomas Martin Johnson; Craig C Lundstrom; Philip E Long; Kenneth Hurst Williams
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-2-5
Journal Detail:
Title:  Environmental science & technology     Volume:  -     ISSN:  1520-5851     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-2-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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