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Confocal micrometer-scale X-ray fluorescence and X-ray absorption fine structure studies of uranium speciation in a tertiary sediment from a waste disposal natural analogue site
MA. Denecke, K. Janssens, K. Proost, J. Rothe, U. Noseck,
Jazyk angličtina Země Spojené státy americké
Typ dokumentu srovnávací studie, časopisecké články
PubMed
15871236
DOI
10.1021/es048644k
Knihovny.cz E-zdroje
- MeSH
- absorpční fotometrie metody MeSH
- arsenikové přípravky analýza chemie MeSH
- chemické modely * MeSH
- geologické sedimenty analýza MeSH
- radioaktivní látky znečišťující půdu analýza MeSH
- radioaktivní odpad analýza MeSH
- sloučeniny uranu analýza chemie MeSH
- spektrometrie rentgenová emisní metody MeSH
- Publikační typ
- časopisecké články MeSH
- srovnávací studie MeSH
- Geografické názvy
- Česká republika MeSH
Investigations by micrometer-scale X-ray fluorescence and X-ray absorption fine structure (micro-XRF and micro-XAFS) recorded in a confocal geometry on a bore core section of a uranium-rich tertiary sediment are performed in order to assess mechanisms leading to immobilization of the uranium during diagenesis. Results show uranium to be present as a tetravalent phosphate and that U(IV) is associated with As(V). Arsenic present is either As(V) or As(O); we found no evidence for As(III). The As(O) is observed to be intimately associated with the surface of Fe(II) nodules and likely arsenopyrite. A hypothesis for the mechanism of uranium immobilization is proposed, where arsenopyrite acted as reductant of groundwater-dissolved U(VI), leading to precipitation of less soluble U(IV) and thereby forming As(V).
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