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Historical roasting of thallium- and arsenic-bearing pyrite: Current Tl pollution in the Riotinto mine area

AutorLópez-Arce, Paula ; Garrido, Fernando ; García-Guinea, Javier ; Voegelin, Andreas; Göttlicher, Jörg; Nieto, J. M.
Palabras claveThallium
Tl-jarosite
Riotinto mine
Environmental pollution
Tl XANES
Colloids
Fecha de publicación15-ene-2019
EditorElsevier
CitaciónScience of The Total Environment 648: 1263-1274 (2019)
ResumenSamples of an open-air pyrite roasting heap from the 19th century in the Riotinto mine area (SW Spain) and surrounding sediments and soil along a seasonal surface runoff channel were analyzed to study thallium (Tl) phase transformations during historical roasting of Tl-bearing arsenian pyrite, secondary weathering processes, Tl dispersion and current environmental pollution. Results from Electron Probe Microanalyses (EPMA) indicate an even distribution of Tl in pyrite grains of an ore sample (22 mg kg−1 total Tl), suggesting that Tl is incorporated in the pyrite structure rather than in discrete Tl-sulfide microparticles. The roasting residue (122 mg kg−1 total Tl) consists mainly of hematite. EPMA suggested that Tl in the roasting residue and contaminated soil was co-occurring with Fe oxide particles, with a mean Tl point concentration of 0.12% in samples from the roasting residues. Total concentrations of Tl in soil samples decrease with distance from the roasting heap to 14 mg kg−1. X-ray absorption near-edge structure (XANES) spectra collected on pyrite roasting residue and a soil sample suggest that most Tl is Tl(I) substituting K in jarosite. Sequential extractions show that most Tl (85–99%) in the soil and sediment samples is concentrated in the residual fraction and, thus, is rather strongly bound. Lastly, water extracts indicate that colloidal particles (i.e. <1 μm size) may contribute to the dispersion of Tl around and away from the roasting heaps.
Versión del editorhttps://doi.org/10.1016/j.scitotenv.2018.08.260
URIhttp://hdl.handle.net/10261/169755
DOI10.1016/j.scitotenv.2018.08.260
ISSN0048-9697
E-ISSN1879-1026
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