Concentración y fraccionamiento de Tierras Raras en el agua del sistema fluvio-marino del río Tinto (SO de España)

Abstract

The REE concentration in the water of the Tinto river decreases from the fluvial sector (1098.63 μg·l-1) to the zone of greater marine influence (0.33 μg·l-1) showing a strong longitudinal gradient in the estuarine mixing zone, where conductivity goes from 10 to 50 mS·cm-1 and pH from 3 to 6. The fluvial sector shows a typical fractionation pattern of acid environments, with a convex morphology centered in the Gd. In agreement we approached the marine sector of the estuary, with conductivities greater than 50 mS·cm-1 and pH bigger than 6, this model evolves towards a fractionation pattern with a clear depletion in LREE that preferably are adsorbed on the particle surfaces