Geochemical weathering increases lead bioaccessibility in semi-arid mine tailings.

Environmental Science & Technology
Sarah M HayesJon Chorover

Abstract

Mine tailings can host elevated concentrations of toxic metal(loid)s that represent a significant hazard to surrounding communities and ecosystems. Eolian transport, capable of translocating small (micrometer-sized) particles, can be the dominant mechanism of toxic metal dispersion in arid or semiarid landscapes. Human exposure to metals can then occur via direct inhalation or ingestion of particulates. The fact that measured doses of total lead (Pb) in geomedia correlate poorly with blood Pb levels highlights a need to better resolve the precise distribution of molecularly speciated metal-bearing phases in the complex particle mixtures. Species distribution controls bioaccessibility, thereby directly impacting health risk. This study seeks to correlate Pb-containing particle size and mineral composition with lability and bioaccessibility in mine tailings subjected to weathering in a semiarid environment. We employed X-ray absorption spectroscopy (XAS) and X-ray fluorescence (XRF), coupled with sequential chemical extractions, to study Pb speciation in tailings from the semiarid Arizona Klondyke State Superfund Site. Representative samples ranging in pH from 2.6 to 5.4 were selected for in-depth study of Pb solid-phase speciati...Continue Reading

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Citations

Dec 3, 2013·Environmental Geochemistry and Health·Ariadne Argyraki
Jul 19, 2011·Environmental Science & Technology·Sarah M HayesJon Chorover
Mar 8, 2016·Environmental Pollution·Efstratios KelepertzisHana Šillerová
Mar 2, 2016·Chemosphere·Shuang LiangLena Q Ma
Jul 7, 2012·The Science of the Total Environment·Janae CsavinaA Eduardo Sáez
Sep 10, 2014·Geochimica Et Cosmochimica Acta·Sarah M HayesJon Chorover
Nov 10, 2015·Applied Geochemistry : Journal of the International Association of Geochemistry and Cosmochemistry·Robert A RootJon Chorover
Jan 28, 2015·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Ian T BurkeVictoria S Coker
Nov 2, 2016·Environmental Science & Technology·Lucia Rodriguez-FreireJosé M Cerrato
Aug 10, 2017·Environmental Science. Processes & Impacts·Michael Schindler, Michael F Hochella
Jan 3, 2018·Journal of Environmental Quality·Ranju R KarnaKirk G Scheckel
Nov 22, 2020·The Science of the Total Environment·Vítor Otacílio de AlmeidaIvo André Homrich Schneider
Feb 3, 2021·Environmental Science. Processes & Impacts·Corona-Sánchez Jesús EulisesKirk G Scheckel

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