RBS and μPIXE analysis of uranium diffusion from bentonite to the rock matrix in a deep geological waste repository

Alonso, Úrsula; Missana, Tiziana; Patelli, Alessandro; Ravagnan, Jacopo; Rigato, V.

doi:10.1016/s0168-583x(03)00454-3

Cited by 14 publications

(2 citation statements)

References 31 publications

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“…Among these studies smectites have been considered and have been found as effective in U(VI) sorption [19] due to their high cation exchange capacity and high specific surface area. This property of smectites, especially montmorillonite, was exploited in the construction of reactive barriers or preparation of backfilling materials [20][21][22] preventing from the U(VI) emission to the groundwater and soil from the radioactive waste storage tanks. It is worth of mentioning the removal of uranium from contaminated ground water using zero valent iron [23], which is currently under evaluation at several U.S. Department of Energy (DOE) facilities.…”

Section: Introductionmentioning

confidence: 99%

Uranium sorption on bentonite modified by octadecyltrimethylammonium bromide

Majdan

Pikus

Gajowiak

et al. 2010

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 99%

Uranium sorption on bentonite modified by octadecyltrimethylammonium bromide

Majdan

Pikus

Gajowiak

et al. 2010

Journal of Hazardous Materials

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“…Investigations of the sites of U adsorption by the direct methods Rutherford backscattering, particle-induced X-ray emission (Alonso et al 2003), and secondary ion mass spectrometry (Berry et al 1994) demonstrate that adsorbed U on rock surfaces correlates with Fe(III) and Ti, but not with Si, Al, and K. Identified Ti minerals are rutile, sphene, and ilmenite. The silicates biotite, chlorite, epidote, and augite contain Fe(III) and adsorb U. Quartz and feldspars adsorb little or no U.…”

Section: General Observationsmentioning

confidence: 99%

Gain and loss of uranium by meteorites and rocks, and implications for the redistribution of uranium on Mars

Dreibus

Haubold

Huisl

et al. 2007

Meteorit & Planetary Scien

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Abstract-Terrestrial alteration of meteorites results in the redistribution, gain, or loss of uranium and other elements. We have measured the maximum U adsorption capacity of a meteorite and two geochemical reference materials under conditions resembling terrestrial ones (pH 5.8). The basaltic eucrite Sioux County adsorbs 7 ppm of U. The result for the terrestrial granite AC-E is similar (5 ppm), while the basalt BE-N adsorbs 34 ppm of U.We have also investigated U adsorption in the presence of phosphate (0.01 M or less) in imitation of conditions that probably occurred in the earlier history of Mars. Such a process would have alterated Martian surface material and would be noticeable in Martian meteorites from the affected surface. The experiments demonstrated the counteracting effects of phosphate, which increases U adsorption, but decreases the quantity of dissolved U that is available for adsorption. U adsorption by AC-E increases to 7 ppm. The lowered value for BE-N of 8 ppm results from the low quantity of dissolved U in the volume of solution used.The results from the adsorption experiments and from leaching the Martian meteorite Zagami and a terrestrial basalt imply that the aqueous redistribution of U on Mars was moderate. Acidic liquids mobilized uranium and other metals, but present phosphate impeded the dissolution of U compounds. Some mobilized U may have reached the global sinks, while most of it probably was transported in the form of suspended particles over a limited distance and then settled.

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Identification and Speciation of Actinides in the Environment

Degueldre¹

2010

The Chemistry of the Actinide and Transactinide Elements

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RBS and μPIXE analysis of uranium diffusion from bentonite to the rock matrix in a deep geological waste repository

Cited by 14 publications

References 31 publications

Uranium sorption on bentonite modified by octadecyltrimethylammonium bromide

Uranium sorption on bentonite modified by octadecyltrimethylammonium bromide

Gain and loss of uranium by meteorites and rocks, and implications for the redistribution of uranium on Mars

Identification and Speciation of Actinides in the Environment

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