Abstract
Research has shown the presence of high levels of arsenic (up to 2666 mg As kg−1) in tailings from a gold mining area of Brazil. This is an important point of attention, generating concerns about impacts on human health. Yet, a recent study showed that As bioaccessibility in the same area was very low (<4.4 %). Thus, determination of the direct solid-phase speciation of As in the mine tailings and windblown dust is needed to explain this low bioaccessibility. Mine samples were collected from four subareas and windblown dust from eight sites. Synchrotron-based bulk-X-ray absorption near-edge structure (bulk-XANES) spectroscopy, micro-X-ray absorption near-edge structure (μ-XANES), and μ-X-ray fluorescence (μ-SXRF) spectroscopy were applied to determine As speciation. Bulk-XANES spectra indicated that As occurs as the As(V) oxidation state. Micro-XANES and μ-SXRF analyses revealed that As was also present as arsenopyrite (FeAsS) and its weathering products, but mostly it was As(V) as poorly crystalline ferric arsenate. This supports the findings of low bioaccessible As and highlights the importance of Fe oxides in immobilizing As in the terrestrial environment. All air particulate samples exhibited As-rich particles (up to 313 mg As kg−1). The air particulates exhibited solid-phase As species very similar to those found in the mine samples, which indicates that As in the windblown dust is not easily available.
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Acknowledgments
We gratefully acknowledge funding received from CNPq, CAPES, and FAPEMIG, Brazil. We acknowledge the Brazilian Synchrotron Light Laboratory-LNLS technical, scientific, and administrative staff for assisting with the bulk-XAS analysis (project 11781, supported by LNLS/ABTLuS/MCT). Use of the National Synchrotron Light Source (NSLS), Brookhaven National Laboratory, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences. Beamline X27A at NSLS is supported in part by the U.S. Department of Energy—Geosciences (DE-FG02-92ER14244 to The University of Chicago—CARS). We would like to thank the Delaware Environmental Institute (DENIN) and Environmental Soil Chemistry research group of the University of Delaware, especially Cecily Moyer and Matt Siebecker for their assistance during the experimental analyses. Fábio Ono appreciates the Sandwich Doctorate fellowship for this work funded by Capes, and also the support of the University of Delaware.
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Ono, F.B., Tappero, R., Sparks, D. et al. Investigation of arsenic species in tailings and windblown dust from a gold mining area. Environ Sci Pollut Res 23, 638–647 (2016). https://doi.org/10.1007/s11356-015-5304-y
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DOI: https://doi.org/10.1007/s11356-015-5304-y