Publications des scientifiques de l'IRD

Lahrouch F., Baptiste B., Dardenne K., Rothe J., Elkaim E., Descostes M., Gérard Martine. (2022). Uranium speciation control by uranyl sulfate and phosphate in tailings subject to a Sahelian climate, Cominak, Niger. Chemosphere, 287 (2), 132139 [11 p.]. ISSN 0045-6535.

Titre du document
Uranium speciation control by uranyl sulfate and phosphate in tailings subject to a Sahelian climate, Cominak, Niger
Année de publication
2022
Type de document
Article référencé dans le Web of Science WOS:000704947900010
Auteurs
Lahrouch F., Baptiste B., Dardenne K., Rothe J., Elkaim E., Descostes M., Gérard Martine
Source
Chemosphere, 2022, 287 (2), 132139 [11 p.] ISSN 0045-6535
Long-term uranium mobility in tailings is an environmental management issue. The present study focuses on two U-enriched layers, surficial and buried 14.5 m, of the tailings pile of Cominak, Niger. The acidic and oxidizing conditions of the tailings pile combined with evapotranspiration cycles related to the Sahelian climate control U speciation. Uraninite, brannerite, and moluranite as well as uranophane are relict U phases. EXAFS spectroscopy, HR-XRD, and SEM/WDS highlight the major role of uranyl sulfate groups in uranium speciation. Uranyl phos-phate neoformation in the buried layer (paleolayer) acts as an efficient trap for uranium.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020] ; Pollution [038] ; Géologie et formations superficielles [064]
Description Géographique
NIGER ; ZONE SAHELIENNE
Localisation
Fonds IRD [F B010083224]
Identifiant IRD
fdi:010083224
Contact