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  • 1
    Publication Date: 2021-03-29
    Description: The effects of carbonate concentration and the presence of iron hydroxide phases on uranium release into the environment were investigated under oxic conditions and in the pH range from 6 to 9. For this purpose not-shaken batch experiments were conducted with a constant amount (8, 10 or 40 g/l) of a uranium bearing rock and different types of water (deionised, tap and mineral water). For comparison parallel experiments were conducted with 0.1 M Na 2 CO 3 and 0.1 M H 2 SO 4 . The use of dolomite confirmed the favourable role of carbonate bearing minerals for U transport while the presence of pyrite on Uranium mobilisation was shown to be considerably more complex. This study shows that the approach of equilibrium conditions can be strongly delayed by sorption processes.
    Description: research
    Keywords: 551.9 ; VJF 000 ; Umweltgeochemie insgesamt
    Language: German
    Type: article , publishedVersion
    Format: 29 S.
    Format: application/pdf
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  • 2
    Publication Date: 2021-03-29
    Description: Zerovalent iron (ZVI) has been proposed as reactive material in permeable in situ walls for contaminated groundwater. An economically feasible ZVI-based reactive wall requires cheap but efficient iron materials. From an uranium treatability study and results of iron dissolution in 0.002 M EDTA by five selected ZVI materials, it is shown that current research and field implementation is not based on a rational selection of application-specific iron metal sources. An experimental procedure is proposed which could enable a better material characterization. This procedure consists of mixing ZVI materials and reactive additives, including contaminant releasing materials (CRMs), in long-term batch experiments and characterizing the contaminant concentration over the time.
    Description: Keywords: iron, redox reactions, uranium water, treatment
    Description: research
    Keywords: 551.9 ; VJF 000 ; Umweltgeochemie insgesamt
    Language: English
    Type: article , publishedVersion
    Format: 17 S.
    Format: application/pdf
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