The influence of hematite on the sorption of uranium(VI) onto granite filling fractures

Casas, I.; Casabona, D.; Duro, Lara; Pablo, Joan de

doi:10.1016/0009-2541(94)90073-6

Cited by 28 publications

(15 citation statements)

References 6 publications

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“…Uranium sorption onto clay minerals and rocks has been studied by different authors [7][8][9][10]. The retardation effects due to the presence of iron(III) oxy/hydroxides on the uranium migration have also been pointed out in different publications [10][11][12].…”

Section: Introductionmentioning

confidence: 98%

Experimental study and modeling of uranium (VI) transport through ferrous olivine rock columns

Rovira¹,

Aamrani²,

Duro³

et al. 2000

Radiochimica Acta

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The Lovasjärvi intrusion (SE-Finland) contents a high percentage of ferrous olivine (> 65%). This material has been suggested as a redox-active backfill-additive in deep nuclear waste repositories, due to the large Fe(II) proportion in its mineral composition. In order to understand the processes involved in the redox buffering capacity of this material the transport of uranium (VI) through olivine columns was studied. The results showed considerable retardation factor for the U(VI), particularly in carbonate-free media. The experimental data were simulated by means of reactive transport modeling. The best agreement between the experimental and calculated data was obtained considering that the interaction of U(VI) with the olivine surface occurred at two different types of sorption sites. One type accounts for the sorption capacity of the olivine mineral, and a second type accounts for the sorption on amorphous Fe(OH)

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Section: Introductionmentioning

confidence: 98%

Experimental study and modeling of uranium (VI) transport through ferrous olivine rock columns

Rovira¹,

Aamrani²,

Duro³

et al. 2000

Radiochimica Acta

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“…ones which assume linear local equilibrium) have the potential to accurately describe subsurface U(VI) transport. However, as previously reported for other synthetic (Hsi and Langmuir, 1985;Waite et al, 1994;Morrison et al, 1995;Kohler et al, 1996) and natural (Casas et al, 1994;Ticknor, 1994;Barnett et al, 2002) Fe(III) oxide minerals, U(VI) adsorption to these two media is strongly pH-dependent (Fig. 9).…”

Section: Batch U(vi) Sorption On Fe(iii) Oxide-bearing Materialsmentioning

confidence: 72%

Reductive immobilization of U(VI) in Fe(III) oxide-reducing subsurface sediments: Analysis of coupled microbial-geochemical processes in experimental reactive transport systems

Roden¹,

Urrutia²,

Barnett³

et al. 2002

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“…In chemical deposits, U and Fe are hosted in the same phase since U co-precipitates on Fe-(Mn)-hydroxyoxides (e.g., Campbell and Steele-Mallory 1979;Reynolds et al 1985;Duff et al 2002) and U may be scavenged on Fe-hydroxyoxides, sulfides, and organic matter (e.g., Langmuir 1978;Plant et al 1999;Casas et al 1994;Davis et al 2004). For instance, botryoidal hematite from hydrothermal vein Fe-deposits typically has U contents in the range of 5 to 30 ppm, but may reach up to 600 ppm U on former crystal surfaces where U had been scavenged and 1 Irradiating iron and kamacite with neutrons in a reactor core generates abundant lattice defects through collision cascades and eventually increases the coercive force of iron and kamacite (e.g., Butler and Cox 1971).…”

Section: A-damage and Secondary Magnetizationmentioning

confidence: 99%

Secondary Fe–Mn-oxides in minerals heavily damaged by α-recoil: possible implications for palaeomagnetism

Romer

Nowaczyk

Wirth

2006

Int J Earth Sci (Geol Rundsch)

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Sub-micron Fe,Mn-oxides in columbitetantalite minerals are bound to metamict domains in the host. These nano-oxides are secondary minerals as the metamict zones formed through accumulation of damages from a-recoil, each of which in a small volume destroys the crystal lattice of the U and Th bearing columbite-tantalite host. Transmission electron microscope investigations demonstrate that the oxides fall in the compositional range of magnetite-jacobsiteiwakiite (Fe,Mn) 3 O 4 and of hematite-type minerals along the Fe 2 O 3 -Mn 2 O 3 join, i.e., minerals that are known to be major carriers of magnetic remanence. Measured magnetic properties of isolated columbitetantalite crystals demonstrate in some samples magnetic remanence, which is bound to sub-micron pseudosingle-domain crystals rather than to the host. Thus, the magnetic remanence is not related to the formation of columbite-tantalite, but to the crystallization of the nano-oxides, which occur in metamict domains of the host and therefore are secondary. Depending on the content and distribution of U and Th, the nano-oxides may form diachronously within an individual and among several host crystals. Magnetic secondary nano-oxides are not restricted to columbitetantalite minerals, but may occur in other minerals where high contents of Fe and Mn are associated with high contents of U and Th. Rocks that show the same spatial distribution for U and Fe, as for instance some red sandstones, may display magnetic properties that are controlled by recoil-induced growth of secondary Fe-oxides.

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The influence of hematite on the sorption of uranium(VI) onto granite filling fractures

Cited by 28 publications

References 6 publications

Experimental study and modeling of uranium (VI) transport through ferrous olivine rock columns

Experimental study and modeling of uranium (VI) transport through ferrous olivine rock columns

Reductive immobilization of U(VI) in Fe(III) oxide-reducing subsurface sediments: Analysis of coupled microbial-geochemical processes in experimental reactive transport systems

Secondary Fe–Mn-oxides in minerals heavily damaged by α-recoil: possible implications for palaeomagnetism

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