Groundwater chemistry along flow paths between a proposed repository site and the accessible environment

Ogard, A.E.; Kerrisk, J.F.

doi:10.2172/59179

Cited by 46 publications

(98 citation statements)

References 12 publications

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“…They are not subject to changes in oxidation state in the groundwater compositions expected in Yucca Mountain. Radium and cesium are invariably present as the simple Ra2+ and Cs' cations in the expected groundwater compositions (Ogard and Kerrisk 1984). Strontium exists primarily as the Sr2' ion in these waters but may also be present as the neutral aqueous species SrS04 at concentrations of a few percent of the total strontium solution concentration (Ogard and Kerrisk 1984).…”

Section: Cesium Radium and Strontiummentioning

confidence: 99%

“…Radium and cesium are invariably present as the simple Ra2+ and Cs' cations in the expected groundwater compositions (Ogard and Kerrisk 1984). Strontium exists primarily as the Sr2' ion in these waters but may also be present as the neutral aqueous species SrS04 at concentrations of a few percent of the total strontium solution concentration (Ogard and Kerrisk 1984). The data of Langmuir and Riese (1985) indicate that RaS04/Ra2+ will be greater or equal to 0.6 when the sulfate ion concentration is greater than M. These numbers suggest that RaS04 will be a significant species (RaC03 and SrC03 may also be significant).…”

Section: Cesium Radium and Strontiummentioning

confidence: 99%

“…In addition, the solubility of RaS04 limits the concentrations in solution to trace levels (lO-'-lO-* M; Ogard and Kerrisk 1984). At concentrations below the solubility limit for RaS04, sorption coefficients for radium are greater than 100 mL g-' in essentially all rock-water combinations tested, using barium as an analog for radium (Knight and Thomas 1987).…”

Section: Data From Laboratory Sorption Experiments With Yucca Mountaimentioning

confidence: 99%

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Unsaturated Zone and Saturated Zone Transport Properties (U0100)

Conca¹

2000

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Section: Cesium Radium and Strontiummentioning

confidence: 99%

Section: Cesium Radium and Strontiummentioning

confidence: 99%

Section: Data From Laboratory Sorption Experiments With Yucca Mountaimentioning

confidence: 99%

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Unsaturated Zone and Saturated Zone Transport Properties (U0100)

Conca¹

2000

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“…We exclude the existence of this compound in J-13 groundwater since the potassium content of this water is far lower than the sodium content. 2 The formation of an isostructural sodium analogue is more likely under these conditions. However, none of the published patterns of sodium neptunyl(V) carbonates with varying stochiometry and hydration number can unequivocally provide a complete match for this phase.…”

Section: Identification Of Solidsmentioning

confidence: 99%

Solubility and speciation studies of waste radionuclides pertinent to geologic disposal at Yucca Mountain: Results on neptunium, plutonium and americium in J-13 groundwater; Letter report (R707): Reporting period, October 1, 1985--September 30, 1987

Nitsche¹,

Standifer²,

Gatti³

et al. 1988

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SummaryWe have studied the solubilities of neptunium, plutonium, and americium in J-13 groundwater from Yucca mountain (Nevada) at three temperatures and hydrogen ion concentrations. They are 25°, 60°C, and 90°C and pH 5.9, 7.0, and 8.5. Tables I, II, and III summarize the results for neptunium, plutonium, and americium, respectively.The results for 25°C are from a study which we did during FY 1984. We included these previous results in the tables to give more information on the solubility tempera ture dependance; they were, however, done at only one pH (7.0). The solubilities were studied from oversaturation. The nuclides were added at the beginning of each NNWSI-LBL-R707, Rl Page 3 of 70 Table I. Summary of results for solubility experiments on neptunium in J-13 groundwater at pH 5.9, 7.0, and 8.5, and at 25°, 60°, and 90°C. NNWSI-LBL-R707, RlPage 4 of 70 Table II. Summary of results for solubility experiments on plutonium in J-13 groundwater at pH 5.9, 7.0, and 8.5, and at 25°, 60°, and 90°C. 3. We need steady-state concentrations for the americium experiments at 60° and 90°C. We attribute the problems in die 60°C study to a-induced damage of the solubility container. This damage released particles into the solution on which americium pseudocolloids probably formed. To reduce the radiation level, we will replace the 243 Am with the stable lanthanide neodymium. Neodymium has similar properties to americium, including nearly identical ionic radii and valency.Additionally, neodymium carbonates and hydroxycarbonates are well character ized. We should be able to get steady-state concentrations from neodymium solu bility studies. Because of the similarity between the two elements, the results for neodymium also apply to americium.4. We plan to measure the solubilities of neptunium, plutonium, and americium in UE25p#l groundwater. This water has a higher ionic strength than J-13 water, which could affect the solubitities. These experiments will be performed at 25°and 60°C and pH values of 6, 7, and 8.5. 8. We recommend the expansion of solubility studies to other waste radionuclides.Important waste elements with solubility-limited concentrations are uranium, thorium, radium, nickel, and zirconium. OBJECTIVESThis study determines the solubilities and the oxidation state distributions (when ever possible the speciation) of waste elements in groundwaters of the potential reposi tory at Yucca Mountain.Radiation-induced heat can generate elevated temperatures at the repository. Pos sible chemical interaction of groundwater flowing through the repository with the backfill material and/or the canister material can alter the pH value of the groundwater.As a consequence of these conditions, this study will investigate the effects of tem perature and pH changes on the solubilities and speciation of waste element solutions.The data will be used as input to model radionuclide transport from the reposi tory.These data will also be compared with solubilities calculated by the EQ 3/6Chemical Equilibrium Code which is used to m...

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“…The ionic strength of the UE-25p #1 water is higher than that of the J-13 water. Both waters are oxidizing (Ogard and Kerrisk 1984).…”

Section: Groundwater Chemistry Of Wells 5-13 and Ue-25p #1mentioning

confidence: 99%

Progress report on colloid-facilitated transport at Yucca Mountain: Yucca Mountain site characterization program milestone 3383

Triay¹,

Degueldre²,

Wistrom³

et al. 1996

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Groundwater chemistry along flow paths between a proposed repository site and the accessible environment

Cited by 46 publications

References 12 publications

Unsaturated Zone and Saturated Zone Transport Properties (U0100)

Unsaturated Zone and Saturated Zone Transport Properties (U0100)

Solubility and speciation studies of waste radionuclides pertinent to geologic disposal at Yucca Mountain: Results on neptunium, plutonium and americium in J-13 groundwater; Letter report (R707): Reporting period, October 1, 1985--September 30, 1987

Progress report on colloid-facilitated transport at Yucca Mountain: Yucca Mountain site characterization program milestone 3383

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