GEOSCAN, résultats de la recherche


TitreDirect characterization of airborne particles associated with arsenic-rich mine tailings: Particle size, mineralogy and texture
AuteurCorriveau, M C; Jamieson, H E; Parsons, M B; Campbell, J L; Lanzirotti, A
SourceApplied Geochemistry vol. 26, 9-10, 2011 p. 1639-1648,
Séries alt.Secteur des sciences de la Terre, Contribution externe 20100051
Documentpublication en série
Mediapapier; en ligne; numérique
SNRC11D/12; 11E/01; 11F/04
Lat/Long OENS -64.0000 -63.5000 44.7500 44.5000
Lat/Long OENS -62.5000 -61.5000 45.2500 45.0000
Sujetscontamination des métaux lourds; arsenic; pollution; substances polluantes; résidus; analyses des résidus; géochimie des résidus; diffraction des rayons x; analyses par diffraction des rayons x; microscopie électronique à balayage; analyses au microscope électronique à balayage; or; mines; textures; analyses de textures; minéralogie; géologie de l'environnement
Illustrationslocation maps; photographs; spectra; tables; photomicrographs; plots
ProgrammeGestionnaire de programme, Géosciences environnementales
Résumé(disponible en anglais seulement)
Windblown and vehicle-raised dust from unvegetated mine tailings can be a human health risk. Airborne particles from As-rich abandoned Au mine tailings from Nova Scotia, Canada have been characterized in terms of particle size, As concentration, As oxidation state, mineral species and texture. Samples were collected in seven aerodynamically fractionated size ranges (0.5 - 16 lm) using a cascade impactor deployed at three tailings fields. All three sites are used for recreational activities and off-road vehicles were racing on the tailings at two mines during sample collection. Total concentrations of As in the <8 lm fraction varied from 65 to 1040 ng/m3 of air as measured by proton-induced X-ray emission (PIXE) analysis. The same samples were analysed by synchrotron-based microfocused X-ray absorption nearedge spectroscopy (lXANES) and X-ray diffraction (lXRD) and found to contain multiple As-bearing mineral species, including Fe–As weathering products. The As species present in the dust were similar to those observed in the near-surface tailings. The action of vehicles on the tailings surface may disaggregate material cemented with Fe arsenate and contribute additional fine-grained As-rich particles to airborne dust. Results from this study can be used to help assess the potential human health risks associated with exposure to airborne particles from mine tailings.