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ENHANCED IMMOBILIZATION OF ARSENIC FROM ACID MINE DRAINAGE BY DETRITAL CLAY MINERALS
Lefticariu, L., S.R. Sutton, A. Lanzirotti, and T.M. Flynn.
ACS Earth and Space Chemistry 3(11):2525-2538(2019)
In this study, detrital clay minerals originating from the partial weathering of coal mining waste substantially increased total As uptake by acid mine drainage (AMD) sediments. The As immobilization mechanisms by the AMD sediments were investigated by the combined use of microbial community structure characterization (16S rRNA), chemical extractions, and synchrotron-based X-ray fluorescence, diffraction, and absorption. The use of an X-ray spot size as small as one micrometer allowed a detailed examination of the heterogeneous AMD sediments. Results suggest that during sustained redox cycling of iron in Fe(III)NP-clay mixed-mineral systems, the clays controlled As mobility by (1) enhancing heterogeneous precipitation of Fe(III) )NP under oxic conditions, which then adsorbed or incorporated As; and (2) facilitating the transfer of As from Fe(III) )NP to clay during microbially mediated reduction of Fe(III) )NP coatings under anoxic conditions.
ACS Earth and Space Chemistry 3(11):2525-2538(2019)
In this study, detrital clay minerals originating from the partial weathering of coal mining waste substantially increased total As uptake by acid mine drainage (AMD) sediments. The As immobilization mechanisms by the AMD sediments were investigated by the combined use of microbial community structure characterization (16S rRNA), chemical extractions, and synchrotron-based X-ray fluorescence, diffraction, and absorption. The use of an X-ray spot size as small as one micrometer allowed a detailed examination of the heterogeneous AMD sediments. Results suggest that during sustained redox cycling of iron in Fe(III)NP-clay mixed-mineral systems, the clays controlled As mobility by (1) enhancing heterogeneous precipitation of Fe(III) )NP under oxic conditions, which then adsorbed or incorporated As; and (2) facilitating the transfer of As from Fe(III) )NP to clay during microbially mediated reduction of Fe(III) )NP coatings under anoxic conditions.
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