التفاصيل البيبلوغرافية
| العنوان: |
Solubility and speciation results from over- and undersaturation experiments on neptunium, plutonium, and americium in water from Yucca Mountain region well UE-25p {number_sign}1 |
| المؤلفون: |
Nitsche, H., Roberts, K., Becraft, K., Prussin, T., Keeney, D., Carpenter, S.A., Hobart, D.E. Lawrence Berkeley Lab., CA . Earth Sciences Div. |
| سنة النشر: |
2009 |
| مصطلحات موضوعية: |
05 NUCLEAR FUELS, 54 ENVIRONMENTAL SCIENCES, YUCCA MOUNTAIN, HYDROLOGY, NEPTUNIUM OXIDES, SOLUBILITY, PLUTONIUM COMPOUNDS, AMERICIUM COMPOUNDS, NEODYMIUM COMPOUNDS, GROUND WATER, RADIONUCLIDE MIGRATION, SITE CHARACTERIZATION, WATER WELLS, SATURATION, RADIOACTIVE WASTE DISPOSAL, HIGH-LEVEL RADIOACTIVE WASTES, VALENCE, TEST FACILITIES, EXPERIMENTAL DATA, envir, geo |
| الوصف: |
Solubility and speciation are important in understanding aqueous radionuclide transport through the geosphere. Results are compared from solubility and speciation experiments from oversaturation and undersaturation of {sup 237}NpO{sub 2{sup +}}, {sup 239}Pu{sup 4+}, and {sup 241}Am{sup 3+}/Nd{sup 3+} in a modified UE-25p-1 groundwater (from the Yucca Mountain region, Nevada, which is being investigated as a potential high-level nuclear waste disposal site) at 60 C and three pH values (6.0, 7.0, 8.5). In the oversaturation experiments, the solubility-controlling steady-state solids were identified and the speciation and/or oxidation states present in the supernatant solutions were determined. The characterized solids were then reintroduced into fresh solutions of the modified UE-25p-1 groundwater to approach the steady state from undersaturation. For the undersaturation experiments, the solubility-controlling steady-state solids were also identified and the speciation and/or oxidation states present in the supernatant solutions were determined. The Np solubility decreased with increasing pH in both the over- and undersaturation experiments. The steady-state concentrations from the two experiments agreed to within an order of magnitude. Pu concentrations from over- and undersaturation agree very well in the pH 6 and 7 experiments. The pH 8.5 oversaturation experiment resulted in a steady-state concentration one order of magnitude above its undersaturation counterpart. For the Am/Nd solutions, the pH 6 and pH 7 experiments resulted in equivalent steady-state concentrations from both over and undersaturation. The pH 8.5 oversaturation experiment was 100 times more soluble than its undersaturation counterpart. 48 refs. |
| نوع الوثيقة: |
other/unknown material |
| اللغة: |
unknown |
| العلاقة: |
http://www.osti.gov/servlets/purl/171272-lsMjAY/webviewableTest/ |
| الإتاحة: |
http://www.osti.gov/servlets/purl/171272-lsMjAY/webviewableTest/ |
| حقوق: |
undefined |
| رقم الانضمام: |
edsbas.A5EA4398 |
| قاعدة البيانات: |
BASE |
