Use este identificador para citar ou linkar para este item: http://repositorio.ufla.br/jspui/handle/1/42154
Título : Arsenic bioaccessibility in gold mine tailings of Delita, Cuba
Autor: Toujaguez, Regla
Ono, Fábio Benedito
Martins, Vanessa
Cabrera, P. P.
Blanco, A. V.
Bundschuh, Jochen
Guilherme, Luiz Roberto Guimarães
Palavras-chave: Trace elements
In vitro tests
Arsenopyrite
Scorodite
Amorphous Fe arsenate
XAS
Bioacessibilidade
Elementos-traço
Testes in vitro
Arsenopirita
Escorodito
Mineração de ouro - Resíduos
Arsênio
Publicador: Elsevier B.V.
Data da publicação: Nov-2013
Referência: TOUJAGUEZ, R. et al. Arsenic bioaccessibility in gold mine tailings of Delita, Cuba. Journal of Hazardous Materials, [S. I.], v. 262, p. 1004-1013, Nov. 2013.
Abstract: A bioaccessibility test was carried out in four tailings collected at a former mining area in Delita, Cuba. A previous risk assessment study identified arsenic (As) as the main critical contaminant in this area and showed that the tailings had high As concentrations (up to 3.5%). This study aimed at: (i) evaluating As bioaccessibility in four tailings (R1, R2, R3 and R4) from a gold mining area to obtain a better health risk estimate; and, (ii) identifying the mineral phases responsible for most of the bioaccessible As using XRD, SEM-EDS, and XAS. The results showed that bioaccessible As in the tailings ranged from 0.65 to 40.5%. The main factors influencing As bioaccessibility were a high occurrence of amorphous iron arsenate; occurrence, even at low content, of iron oxyhydroxides and stability of mineral phases in the environment of the gastrointestinal tract. Although arsenopyrite, arsenates and goethite were confirmed by mineralogical methods such as optical microscopy, XRD, and SEM-EDS, XAS showed that scorodite–oxidation state As(+V)–was dominant in most of the tailings. This confirms that the low bioaccessibility of As in most of the tailings is due to the slow kinetics of As release from scorodite.
URI: https://doi.org/10.1016/j.jhazmat.2013.01.045
http://repositorio.ufla.br/jspui/handle/1/42154
Idioma: en
Aparece nas coleções:DCS - Artigos publicados em periódicos

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