Tracing U Mobility in Deep Groundwater Using Ra Isotopes
| Autor: | Eva-Lena Tullborg, Per Andersson, Lindsay Krall, Don Porcelli, Juhani Suksi, Giada Trezzi, Jordi Garcia-Orellana, Luis F. Auqué |
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| Rok vydání: | 2017 |
| Předmět: |
Activity ratios
Isotope Geochemistry Mineralogy chemistry.chemical_element Earth and Planetary Sciences(all) General Medicine 010501 environmental sciences Uranium 010502 geochemistry & geophysics 01 natural sciences 6. Clean water Crystalline bedrock chemistry Deposition (chemistry) Dissolution Groundwater Geology 0105 earth and related environmental sciences |
| Zdroj: | Zaguán. Repositorio Digital de la Universidad de Zaragoza instname |
| ISSN: | 1878-5220 |
| DOI: | 10.1016/j.proeps.2016.12.122 |
| Popis: | The mobility of natural U is compared among four boreholes in a fractured granite using Ra isotopes and geochemical modelling. Rn-222/Ra-226 activity ratios (ARs) spanning an order of magnitude underline differences in reactive surface area. (Ra-224/Ra-228)(ARs) up to 9 indicate recent changes in hydrogeochemistry, and (Ra-226/Ra-228)(ARs) 0.6-30 indicate variable deposition of U. Dissolved U is related to dissolution of a solid U(VI) phase by groundwater with HCO3- > 20 mg.L-1. U reduction is hindered by Ca2UO2(CO3)(3)(0). |
| Databáze: | OpenAIRE |
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