Artículo
Rare earth elements mobility processes in an AMD-affected estuary: Huelva Estuary (SW Spain)
Fecha de publicación:
05/2017
Editorial:
Pergamon-Elsevier Science Ltd
Revista:
Marine Pollution Bulletin
ISSN:
0025-326X
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Huelva Estuary is a transition zone where REE-rich acidic waters interact with saline-alkaline seawater. This mixing process influences the geochemical and mineralogical characteristics of particulate and dissolved fractions. The Tinto River has >11,000μgL-1 dissolved REE (pH=1.66), whereas seawater only reaches 8.75·10-2 μgL-1 dissolved REE (pH=7.87). REE-normalized patterns in "pH<6 solutions" are parallel and show similarities, diminishing their concentration as pH increases. Sequential extraction performed on the generated precipitates of mixed solutions indicates that most REE are associated to the residual phase. In a second order, REE are associated with soluble salts at pH3 and 3.5 whereas in sediments generated at pH4 and 5, they are distributed in salts (1° extraction), poorly crystallized Fe-bearing minerals (schwertmannite, 3° extraction) and well crystallized Fe-bearing minerals (goethite - hematite, 4° extraction). Finally, precipitated REE are highest at pH6 newly formed minerals with a release to solution in higher pH.
Palabras clave:
Acid Drainage
,
Estuary
,
Mixing Process
,
Rare Earth Elements
Archivos asociados
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Identificadores
Colecciones
Articulos(CICTERRA)
Articulos de CENTRO DE INVEST.EN CS.DE LA TIERRA
Articulos de CENTRO DE INVEST.EN CS.DE LA TIERRA
Citación
Lecomte, Karina Leticia; Sarmiento, A.M.; Borrego, J.; Nieto, J.M.; Rare earth elements mobility processes in an AMD-affected estuary: Huelva Estuary (SW Spain); Pergamon-Elsevier Science Ltd; Marine Pollution Bulletin; 121; 1-2; 5-2017; 282-291
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