Abstract：
:The behavior of uranium in environments, ranging from those of natural systems responsible for the formation of uranium deposits to those of nuclear reactors providing 11% of the world's electricity, is governed by processes involving high-temperature aqueous solutions. It has been well documented that uranium is mobile in aqueous solutions in its oxidized, U6+ state, whereas in its reduced, U4+ state, uranium has been assumed to be immobile. Here, we present experimental evidence from high temperature (>100 °C) acidic brines that invalidates this assumption. Our experiments have identified a new uranium chloride species (UCl4°) that is more stable under reducing than oxidized conditions. These results indicate that uranium is mobile under reducing conditions and necessitate a re-evaluation of the mobility of uranium, particularly in ore deposit models involving this metal. Regardless of the scenario considered, reducing conditions can no longer be considered a guarantee of uranium immobility.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Timofeev A,Migdisov AA,Williams-Jones AE,Roback R,Nelson AT,Xu Hdoi
10.1038/s41467-018-03564-7subject
Has Abstractpub_date
2018-04-16 00:00:00pages
1469issue
1issn
2041-1723pii
10.1038/s41467-018-03564-7journal_volume
9pub_type
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