Arsenic bioaccessibility in gold mine tailings of Delita, Cuba

dc.creatorToujaguez, Regla
dc.creatorOno, Fábio Benedito
dc.creatorMartins, Vanessa
dc.creatorCabrera, P. P.
dc.creatorBlanco, A. V.
dc.creatorBundschuh, Jochen
dc.creatorGuilherme, Luiz Roberto Guimarães
dc.date2020-07-31T18:47:55Z
dc.date2020-07-31T18:47:55Z
dc.date2013-11
dc.date.accessioned2023-09-28T20:09:09Z
dc.date.available2023-09-28T20:09:09Z
dc.identifierTOUJAGUEZ, 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.
dc.identifierhttps://doi.org/10.1016/j.jhazmat.2013.01.045
dc.identifierhttp://repositorio.ufla.br/jspui/handle/1/42154
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/9045721
dc.descriptionA 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.
dc.languageen
dc.publisherElsevier B.V.
dc.rightsrestrictAccess
dc.sourceJournal of Hazardous Materials
dc.subjectTrace elements
dc.subjectIn vitro tests
dc.subjectArsenopyrite
dc.subjectScorodite
dc.subjectAmorphous Fe arsenate
dc.subjectXAS
dc.subjectBioacessibilidade
dc.subjectElementos-traço
dc.subjectTestes in vitro
dc.subjectArsenopirita
dc.subjectEscorodito
dc.subjectMineração de ouro - Resíduos
dc.subjectArsênio
dc.titleArsenic bioaccessibility in gold mine tailings of Delita, Cuba
dc.typeArtigo


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