Mineralogical controls on mobility of rare earth elements in acid mine drainage environments.
Chemosphere
; 205: 317-327, 2018 Aug.
Article
em En
| MEDLINE
| ID: mdl-29704839
ABSTRACT
Rare earth elements (REE) were analyzed in river waters, acid mine waters, and extracts of secondary precipitates collected in the Iberian Pyrite Belt. The obtained concentrations of the REE in river water and mine waters (acid mine drainage - AMD) were in the range of 0.57⯵g/L (Lu) and 2579⯵g/L (Ce), which is higher than previously reported in surface waters from the Iberian Pyrite Belt, but are comparable with previous findings from AMD worldwide. Total REE concentrations in river waters were ranged between 297⯵g/L (Cobica River) and 7032⯵g/L (Trimpancho River) with an average of 2468⯵g/L. NASC (North American Shale Composite) normalized REE patterns for river and acid mine waters show clear convex curvatures in middle-REE (MREE) with respect to light- and heavy-REE. During the dissolution experiments of AMD-precipitates, heavy-REE and middle-REE generate the most enriched patterns in the solution. A small number of precipitates did not display MREE enrichment (an index Gdn/Lunâ¯<â¯1.0) in NASC normalized pattern and produced relatively lower REE concentrations in extracts. Additionally, very few samples, which mainly contained aluminum sulfates, e.g., pickeringite and alunogen, displayed light-REE enrichment relative to heavy-REE (HREE). In general, the highest retention of REE occurs in samples enriched in magnesium (epsomite or hexahydrite) and aluminum sulfates, mainly pickeringite.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ácidos
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Poluentes Químicos da Água
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Monitoramento Ambiental
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Rios
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Metais Terras Raras
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Mineração
Idioma:
En
Revista:
Chemosphere
Ano de publicação:
2018
Tipo de documento:
Article
País de afiliação:
Mongólia