Solubility of uranium (IV) oxide in alkaline aqueous solutions to 300�C

Tremaine, Peter R.; Chen, J. D.; Wallace, Gordon G.; Boivin, W. A.

doi:10.1007/bf00653099

Cited by 33 publications

(10 citation statements)

References 9 publications

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“…This value is in agreement with uranium concentrations found in naturally occurring groundwaters in reducing environments (23)(24)(25), and with recent experimental results under similar conditions (26). A comparison of Figs.…”

Section: Calculated Solubilitiessupporting

confidence: 92%

Calculated uranium solubility in groundwater: implications for nuclear fuel waste disposal

Goodwin¹

1982

Can. J. Chem.

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BRUCE GOODWIN. Can. J. Chem. 60, 1759Chem. 60, (1982.Uranium solubilities of the order of M have been calculated for a range of conditions which are considered to be representative of those expected in a Canadian nuclear fuel waste disposal vault. Factors taken into consideration include the pH and Eh range expected for deep groundwaters, the projected temperature range near a nuclear fuel waste disposal vault, the effect of the composition of two representative groundwaters, the effect of non-ideality, and the effect of the stability of several uranium solids.The model used in these calculations is based on the assumption of chemical equilibrium. Calculations show that the most important factors influencing uranium solubility under the postulated conditions are pH and Eh.These results applied to an assessment of the nuclear fuel waste disposal program suggest that uranium concentrations will be very low in the disposal vault, and that the irradiated UO, fuel matrix will remain relatively intact for long periods of time.BRUCE GOODWIN. Can. J . Chem. 60, 1759Chem. 60, (1982.On a calcule des solubilitCs de I'uranium de I'ordre de M dans un intervalle de conditions que I'on considkre representatif de celles attendues dans une voute d'entreposage de dechets de combustibles nuclkaires canadiens. Les facteurs considCrCs comprennent les domaines de pH et de Eh auxquels on peut s'attendre pour les eaux souterraines profondes, le domaine de temperature prevue prks d'une voute de dCchets de combustibles nuclkaires, I'effet de la composition de deux eaux souterraines representatives, I'effet de non-idialitC et I'effet de stabilitk de plusieurs solides contenant de I'uranium.Le modkle utilisC dans ces calculs repose sur I'hypothkse d'un iquilibre chimique. Les calculs rCvklent que la plupart des facteurs importants qui influencent la solubilitk de I'uranium dans les conditions choisies sont le pH et le Eh.Ces calculs, appliques a une evaluation du programme d'entreposage des dCchets de combustible nucleaire, suggkrent que les concentrations en uranium seront trks faibles dans les voutes d'entreposage et que la matrice de combustible UO, irradii restera relativement intacte pendant un temps assez long.[Traduit par le journal] Introduction container, and eventually leaches the contained The solubility of uranium in natural groundwater radioactive waste for transport to the Surface. is of interest from two viewpoints. For some time, One of the parameters critical to these studies is this subject has been studied in relation .to the the degree to which radioactive waste dissolves in formation and dissolution of uranium ores (I), often natural groundwater. In particular, the solubility of in oxidizing environments, More recently the sub-uranium oxide is very important since the irradiatject has become of interest in relation to the nuclear ed a CANDU2 a~~r O xfuel waste disposal program. This report is oriented i m a t e l~ 98% weight U027 and less than 2% by towards the latter aspect.weight of the more hazardous fission pro...

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Section: Calculated Solubilitiessupporting

confidence: 92%

Calculated uranium solubility in groundwater: implications for nuclear fuel waste disposal

Goodwin¹

1982

Can. J. Chem.

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“…The considerably lower U concentrations measured after the hydrothermal experiment are in accordance with the results of earlier measurements of UO 2 solubility in elevated temperature conditions [40] and with those obtained from studies conducted in alkaline solutions [41]. In the present case, samples were taken from the system after its return into a state that was assumed to be in thermodynamic equilibrium with ambient conditions (p = 100 kPa, T = 25°C); therefore, the concentration profiles must be seen in the view of the chemistry of the solid phases present at these conditions, which will be discussed later.…”

Section: Concentration Profiles and Surface Alterations Under Hydrothsupporting

confidence: 92%

Uranium secondary phase formation during anoxic hydrothermal leaching processes of UO2 nuclear fuel

Amme

Wiss

Thiele

et al. 2005

Journal of Nuclear Materials

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“…Uranium is very mobile in aqueous environments, and elevated concentrations in water-formed sediments are known elsewhere (e.g. Tremaine et al 1981). The black mat samples affected by erosion processes are 2-3× lower in U concentrations than the samples with no evidence of erosion processes, which is consistent with the high mobility of the element.…”

Section: Black Matsupporting

confidence: 61%

“…Tremaine et al . ). The black mat samples affected by erosion processes are 2–3× lower in U concentrations than the samples with no evidence of erosion processes, which is consistent with the high mobility of the element.…”

Section: Resultsmentioning

confidence: 97%

Sediments from around the lower younger dryas boundary (se arizona, usa): implications from la‐icp‐ms multi‐element analysis

Andronikov

Andronikova

2016

Geografiska Annaler: Series A, Physical Geography

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One of the prominent features in sediment sequences formed around the Allerød‐Younger Dryas transition (c. 12.9–12.8 ka bp) in North America is a dark layer of organic‐rich material, i.e. the black mat. The black mat sequences in southeast Arizona contain a thin sandy basal layer corresponding to the lower Younger Dryas boundary. Trace element concentrations in the lower Younger Dryas boundary sediments, in the black mat, in the host sediments, and in charcoal from Western Europe and southeast Arizona were studied using LA‐ICP‐MS. The black mat samples and samples of the underlying host sediments display compositions similar to the average continental crust, while the sediments from the lower Younger Dryas boundary are enriched in rare earth elements, Ni, and Co whereas Ta, Nb, Zr, and Hf are depleted relative to the rare earth elements. Such a difference in compositions between the lower Younger Dryas boundary sediments and other sediments points to a short enigmatic event, which changed conditions of sedimentation just before the onset of the Younger Dryas cooling. The presence of products of biomass burning of still unknown origin is suggested on the basis of trace element features of sediments from the lower Younger Dryas boundary.

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Solubility of uranium (IV) oxide in alkaline aqueous solutions to 300�C

Cited by 33 publications

References 9 publications

Calculated uranium solubility in groundwater: implications for nuclear fuel waste disposal

Calculated uranium solubility in groundwater: implications for nuclear fuel waste disposal

Uranium secondary phase formation during anoxic hydrothermal leaching processes of UO2 nuclear fuel

Sediments from around the lower younger dryas boundary (se arizona, usa): implications from la‐icp‐ms multi‐element analysis

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