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Arsenic in Soils Affected by Mining: Microscopic Studies vs. Sequential Chemical Extraction

Author

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  • Jessica Álvarez-Quintana

    (Mining Exploration and Exploitation Department, Escuela de Ingeniería de Minas, Energía y Materiales, University of Oviedo, 13th Independencia St, 33004 Oviedo, Spain)

  • Rodrigo Álvarez

    (Mining Exploration and Exploitation Department, Escuela de Ingeniería de Minas, Energía y Materiales, University of Oviedo, 13th Independencia St, 33004 Oviedo, Spain)

  • Almudena Ordóñez

    (Mining Exploration and Exploitation Department, Escuela de Ingeniería de Minas, Energía y Materiales, University of Oviedo, 13th Independencia St, 33004 Oviedo, Spain)

Abstract

Soil samples from three inactive mines, corresponding to different Arsenic-bearing mineralization types, were collected and studied. The aim was to determine the influence of mine wastes mineralogy/geochemistry and texture in As mobility and to compare results from sequential chemical extraction and microscopic techniques (optical and electron) at a grain scale. Arsenic in soils is found mainly associated to the residual fraction, indicating that mechanical As dispersion is mainly responsible for As soil pollution. The use of objective microscopic techniques (i.e., Scanning Electron Microscopy-Energy Dispersive Spectroscopy -SEM-EDS-, High Resolution Transmission Electron Microscopy -HR-TEM) has pointed out that the selected sequential extraction method overestimates the role of Mn amorphous oxy-hydroxides and organic matter in As retention while underestimating the mechanism of As adsorption onto clay particle surfaces.

Suggested Citation

  • Jessica Álvarez-Quintana & Rodrigo Álvarez & Almudena Ordóñez, 2020. "Arsenic in Soils Affected by Mining: Microscopic Studies vs. Sequential Chemical Extraction," IJERPH, MDPI, vol. 17(22), pages 1-13, November.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:22:p:8426-:d:444921
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    References listed on IDEAS

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    1. Thinh Nguyen Van & Yasuhito Osanai & Hai Do Nguyen & Kiyoshi Kurosawa, 2017. "Arsenic Speciation and Extraction and the Significance of Biodegradable Acid on Arsenic Removal—An Approach for Remediation of Arsenic-Contaminated Soil," IJERPH, MDPI, vol. 14(9), pages 1-16, August.
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