Identification of uranium enrichment scenarios by multi-method characterisation of immobile uranium phases

The Impact of an Abandoned Uranium Mining Area on the Contamination of Agricultural Land in its Surroundings

“…To obtain more detailed information of uranium bindings in soil, we accomplished sequential analyses based on Tessier's method (Noseck et al 2008).…”

Humic substances extraction, characterization and interaction with U(VI) at Ruprechtov site (CZ)

“…The interaction of U(VI) with HA was described using the charge neutralization model (CNM) [7,22], but according to quite high pH values (5)(6) in the present work, we assumed more cationic U(VI) species than one (i.e., UO 2 2+ ) in solution (see Table 3) [7]. The cation exchange method is performed with a strongly acidic cation exchange resin, where only cationic forms of U(VI), i.e.…”

“…The geology of the Ruprechtov site, including mineralogy and petrology, was described in detail in several contributions [4][5][6]. The natural accumulations of uranium, originating from the underlying granite, were identified within the clay environment, being accompanied with local organic matter accumulation.…”

A multi-technique study of altered granitic rock from the Krunkelbach Valley uranium deposit, Southern Germany

“…This causes additional hazards associated with the release of As into water aquifers. [18][19][20][21][22][23][24] In cases when reduction conditions prevail, such as at the Ruprechtov site in the Czech Republic, As occurs in the form of arsenopyrite (FeAsS) in tertiary sediments forming layered aggregates with secondary uraninite and arsenopyrite. 19 Mixed copper uranyl arsenate-phosphate species have been identied in the soils from an abandoned U mine in the UK as a result of many years of the mining activities at the site.…”

“…Both synchrotron and laboratory methods are extensively used separately and in combination for investigations of structural, redox and degradation properties of U minerals. 18,20,23,[28][29][30] Whilst synchrotron methods provide robust and fast analysis with higher sample penetration depth for elemental mapping and speciation as low as few tens of ppm for some heavier metals, e.g. uranium, laboratory tools provide more detailed analysis of the sample's morphology and more detailed speciation.…”