Speciation and reactivity of uranium products formed during in situ bioremediation in a shallow alluvial aquifer.

ABSTRACT: In this study, we report the results of in situ U(VI) bioreduction experiments at the Integrated Field Research Challenge site in Rifle, Colorado, USA. Columns filled with sediments were deployed into a groundwater well at the site and, after a period of conditioning with groundwater, were amended with a mixture of groundwater, soluble U(VI), and acetate to stimulate the growth of indigenous microorganisms. Individual reactors were collected as various redox regimes in the column sediments were achieved: (i) during iron reduction, (ii) just after the onset of sulfate reduction, and (iii) later into sulfate reduction. The speciation of U retained in the sediments was studied using X-ray absorption spectroscopy, electron microscopy, and chemical extractions. Circa 90% of the total uranium wa

SUBMITTER: Alessi DS 

PROVIDER: S-EPMC4224495 | biostudies-literature | 2014 Nov

REPOSITORIES: biostudies-literature