Aqueous inorganic uranium speciation in European stream waters from the FOREGS dataset using geochemical modelling and determination of a U bioavailability baseline

Elevated uranium concentration and low activity ratio (234U/238U) in the Œuf river as the result of groundwater–surface water interaction (Essonne river valley, South of Paris Basin, France)

“…In LWS only, U was occasionally found in forms of UO2 2+ and UO2OH + . These U aqueous species were in agreement with the ones expected in freshwater (Lartigue et al, 2020;Markich, 2002), i.e., hydroxyl complexes (UO2(OH)n (2-n)+ ) and carbonate complexes (CanUO2(CO3)3) (4-2n)-). Also, U was found to complex with phosphate anion to form UO2(HPO4)2 2-.…”

“…The choice of the thermodynamic database is known to impact the final speciation modelling of aqueous U in natural systems (Lartigue, Charrasse, Reile, & Descostes, 2020;Reiller & Descostes, 2020;X. Wang et al, 2019).…”

Diffusive Gradients in Thin-films technique for uranium monitoring along a salinity gradient: A comparative study on the performance of Chelex-100, Dow-PIWBA, Diphonix, and Lewatit FO 36 resin gels in the Scheldt estuary

“…Calculating U speciation with geochemical modelling is strongly dependant on the completeness of the thermodynamic databases used, affecting especially stable ternary earth alkaline uranyl carbonate complexes [63][64][65][66]. In addition, the composition of organic matter is not well known.…”