Sorption of cesium, barium and europium on magnetite

Catalette, H.; Dumonceau, J.; Ollar, Philippe

doi:10.1016/s0169-7722(98)00123-5

Cited by 61 publications

(44 citation statements)

References 12 publications

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“…A previous work on magnetite has shown that cesium does not bind on pure magnetite phase (5). Nevertheless, some authors have observed a nonnegligible sorption of Cs on natural magnetite, which contains silica as an impurity (e.g., (6,7)). The aim of this work is first to study the sorption of dissolved silicates on the magnetite surface by using both experimental and surface complexation models (SCMs) and second to propose a mechanism for the sorption of Cs on magnetite in the presence of dissolved silicates, which can explain the differences observed in literature data.…”

Section: Introductionmentioning

confidence: 97%

Sorption of Cs(I) on Magnetite in the Presence of Silicates

Marmier

Fromage

2000

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 97%

Sorption of Cs(I) on Magnetite in the Presence of Silicates

Marmier

Fromage

2000

Journal of Colloid and Interface Science

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“…Finally, vis-à-vis the 137 Cs depth profile and its correlation with Fe 3 O 4 , controversial results on their sorption by Fe 3 O 4 have been reported [35][36][37]. It was found that the percentage sorption of 137 Cs by magnetite is pH dependent, increasing by increasing pH of the suspension.…”

Section: Resultsmentioning

confidence: 99%

Radiological and hyperfine characterization of soils from the Northeastern region of the Province of Buenos Aires, Argentina

et al. 2011

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The activity concentrations of both natural ( 238 U and 232 Th chains and 40 K) and anthropogenic ( 137 Cs) radionuclides down along the soil profile have been determined in soil samples collected from inland and coastal areas of the La Plata River, located in the Northeastern region of the Province of Buenos Aires, Argentina. These studies were complemented with 57 Fe Mössbauer spectroscopy characterization, pH, texture and organic carbon content measurements. From Mössbauer results, the sample compositions differ from one area to the other. Spectra from both soil samples are dominated by the Fe 3+ paramagnetic signal. For soil samples from the coastal area, the α-Fe 2 O 3 contribution is lower, Fe 3 O 4 was not detected, and the relative areas of each spectral contribution are nearly constant with depth. For samples from the inland area, the Fe 3+ paramagnetic fraction increases up to 82%, mainly at the expense of the magnetically ordered phase. The main observed activity originates from the decay of 40 K (540-750 Bq/kg), followed by 238 U (60-92 Bq/kg) and 232 Th (37-46 Bq/kg) chains. The activity of 235 U was in all the cases lower than the detection limit (L D = 0.02 Bq/kg). The only determined anthropogenic nuclide was 137 Cs, arising from the fallout of the Southern Hemisphere nuclear weapon tests. Three of the observed differences in the depth distributions can be described by the dispersion-convection model. A correlation 6 M.L. Montes et al. between the natural nuclide activities and the Mössbauer relative fractions was found, whereas no correlation was found between the 137 Cs profile and the relative fraction of Fe 3 O 4 or with other iron species.

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“…POLLUX ® ) and Zircaloy cladding material (∼ 3 t Zr) may offer a total amount of surface sites of about 8.8 × 10 3 mol >Fe-OH and 2.4 × 10 2 mol ≡Zr-OH. Site density data are taken from [156,198]. Due to interaction of the Zircaloy cladding with hydrogen, formation of Zr hydrides (ZrH 2 , ZrH 4 ) will counteract to some extent any ZrO 2 formation (van Uffelen et al, 2010).…”

Section: Radionuclide Retention By Coprecipitation and Sorptionmentioning

confidence: 99%

Radionuclide behaviour in the near-field of a geological repository for spent nuclear fuel

et al. 2012

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UO 2 fuel corrosion / Radionuclide release / Instant release fraction / Hydrogen effect / Coprecipitation / SorptionSummary. Even though chemical processes related to the corrosion of spent nuclear fuel in a deep geological repository are of complex nature, knowledge on underlying mechanisms has very much improved over the last years. As a major result of numerous studies it turns out that alteration of irradiated fuel is significantly inhibited under the strongly reducing conditions induced by container corrosion and consecutive H 2 production. In contrast to earlier results, radiolysis driven fuel corrosion and oxidative dissolution appears to be less relevant for most repository concepts. The protective hydrogen effect on corrosion of irradiated fuel has been evidenced in many experiments. Still, open questions remain related to the exact mechanism and the impact of potentially interfering naturally occurring groundwater trace components. Container corrosion products are known to offer considerable reactive surface area in addition to engineered buffer and backfill material. In combination, waste form, container corrosion products and backfill material represent strong barriers for radionuclide retention and retardation and thus attenuate radionuclide release from the repository near-field.

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Sorption of cesium, barium and europium on magnetite

Cited by 61 publications

References 12 publications

Sorption of Cs(I) on Magnetite in the Presence of Silicates

Sorption of Cs(I) on Magnetite in the Presence of Silicates

Radiological and hyperfine characterization of soils from the Northeastern region of the Province of Buenos Aires, Argentina

Radionuclide behaviour in the near-field of a geological repository for spent nuclear fuel

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