Speciation of natural uranium and thorium in surface waters around a uranium mine (Bistrita Mts., Romania) - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Geochimica et Cosmochimica Acta Année : 2006

Speciation of natural uranium and thorium in surface waters around a uranium mine (Bistrita Mts., Romania)

Résumé

ICP-AES method was used to evaluate the impact of uranium mine dumps on the surface waters from Crucea region (Romania). Speciation modelling indicates that uranyl-carbonate UO2(CO3)2-2 and hydroxy uranyl-carbonate UO2CO3(OH)3- are the main uranium species and that thorium hydroxyl-carbonate Th(OH)3CO3- represents the main thorium species in these waters. Uranium is the most significant trace element in the surface waters nearby the waste rock dumps, sometimes reaching levels op up to 1 mg L-1, well in excess of the Romanian standards limits. A remarkably good correlation exists between dissolved U and the sum of anion concentrations (NO3- + CO32- + SO42- + Cl-) whereas no correlation was found between U and silica, indicating that uranium in these stream waters derived mainly from oxidation of uraniferous bitumen and/or dissolution of carbonates.

Dates et versions

hal-01671763 , version 1 (22-12-2017)

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Essaid Bilal, Lucian Petrescu. Speciation of natural uranium and thorium in surface waters around a uranium mine (Bistrita Mts., Romania). Geochimica et Cosmochimica Acta, 2006, 70, 18, pp.A486. ⟨10.1016/j.gca.2006.06.1434⟩. ⟨hal-01671763⟩
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