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Root RA, Hayes SM, Hammond CM, et al. Toxic metal(loid) speciation during weathering of iron sulfide mine tailings under semi-arid climate. Appl Geochem. 2015;62:131-149doi: 10.1016/j.apgeochem.2015.01.005.
Root, R. A., Hayes, S. M., Hammond, C. M., Maier, R. M., & Chorover, J. (2015). Toxic metal(loid) speciation during weathering of iron sulfide mine tailings under semi-arid climate. Applied geochemistry : journal of the International Association of Geochemistry and Cosmochemistry, 62131-149. https://doi.org/10.1016/j.apgeochem.2015.01.005
Root, Robert A, et al. "Toxic metal(loid) speciation during weathering of iron sulfide mine tailings under semi-arid climate." Applied geochemistry : journal of the International Association of Geochemistry and Cosmochemistry vol. 62 (2015): 131-149. doi: https://doi.org/10.1016/j.apgeochem.2015.01.005
Root RA, Hayes SM, Hammond CM, Maier RM, Chorover J. Toxic metal(loid) speciation during weathering of iron sulfide mine tailings under semi-arid climate. Appl Geochem. 2015 Nov 01;62:131-149. doi: 10.1016/j.apgeochem.2015.01.005. Epub 2015 Feb 07. PMID: 26549929; PMCID: PMC4632981.
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Appl Geochem. 2015 Nov 01;62:131-149. doi: 10.1016/j.apgeochem.2015.01.005. Epub 2015 Feb 07.

Toxic metal(loid) speciation during weathering of iron sulfide mine tailings under semi-arid climate.

Applied geochemistry : journal of the International Association of Geochemistry and Cosmochemistry

Robert A Root, Sarah M Hayes, Corin M Hammond, Raina M Maier, Jon Chorover

Affiliations

  1. Department of Soil, Water and Environmental Science, University of Arizona, Tucson, AZ 85721.

PMID: 26549929 PMCID: PMC4632981 DOI: 10.1016/j.apgeochem.2015.01.005

Abstract

Toxic metalliferous mine-tailings pose a significant health risk to ecosystems and neighboring communities from wind and water dispersion of particulates containing high concentrations of toxic metal(loid)s (e.g., Pb, As, Zn). Tailings are particularly vulnerable to erosion before vegetative cover can be reestablished, i.e., decades or longer in semi-arid environments without intervention. Metal(loid) speciation, linked directly to bioaccessibility and lability, is controlled by mineral weathering and is a key consideration when assessing human and environmental health risks associated with mine sites. At the semi-arid Iron King Mine and Humboldt Smelter Superfund site in central Arizona, the mineral assemblage of the top 2 m of tailings has been previously characterized. A distinct redox gradient was observed in the top 0.5 m of the tailings and the mineral assemblage indicates progressive transformation of ferrous iron sulfides to ferrihydrite and gypsum, which, in turn weather to form schwertmannite and then jarosite accompanied by a progressive decrease in pH (7.3 to 2.3). Within the geochemical context of this reaction front, we examined enriched toxic metal(loid)s As, Pb, and Zn with surficial concentrations 41.1, 10.7, 39.3 mM kg

Keywords: XAS; arsenic; lead; mine tailing; semi-arid; zinc

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