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  • Sorption of Arsenic(V) and Arsenic(III) to schwertmannite

    Author(s)
    D. Burton, Edward
    T. Bush, Richard
    G. Johnston, Scott
    M. Watling, Kim
    K. Hocking, Rosalie
    A. Sullivan, Leigh
    Griffith University Author(s)
    Parker, Gretel
    Year published
    2009
    Metadata
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    Abstract
    This study describes the sorption of As(V) and As(III) to schwertmannite as a function of pH and arsenic loading. In general, sorption of As(V) was greatest at low pH, whereas high pH favored the sorption of As(III). The actual pH of equivalent As(V) and As(III) sorption was strongly loading dependent, decreasing from pH 8.0 at loadings <120 mmolAs molFe-1 to pH 4.6 at a loading of 380 mmolAs molFe-1. Sorption isotherms for As(V) were characterized by strong partitioning to the schwertmannite solid-phase at low loadings and sorption capacities of 225-330 mmolAs(V) molFe-1 at high loadings. In contrast, the As(III) isotherms ...
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    This study describes the sorption of As(V) and As(III) to schwertmannite as a function of pH and arsenic loading. In general, sorption of As(V) was greatest at low pH, whereas high pH favored the sorption of As(III). The actual pH of equivalent As(V) and As(III) sorption was strongly loading dependent, decreasing from pH 8.0 at loadings <120 mmolAs molFe-1 to pH 4.6 at a loading of 380 mmolAs molFe-1. Sorption isotherms for As(V) were characterized by strong partitioning to the schwertmannite solid-phase at low loadings and sorption capacities of 225-330 mmolAs(V) molFe-1 at high loadings. In contrast, the As(III) isotherms revealed a weak affinity for sorption of As(III) versus As(V) at low loadings yet a greater affinity for As(III) sorption compared with As(V) at high loadings (when pH > 4.6). Sorption of As(V) and As(III) caused significant release of SO42- from within the schwertmannite solid-phase, without major degradation of the schwertmannite structure (as evident by X-ray diffraction and Raman spectroscopy). This can be interpreted as arsenic sorption via incorporation into the schwertmannite structure, rather than merely surface complexation at the mineral-water interface. The results of this study have important implications for arsenic mobility in the presence of schwertmannite, such as in areas affected by acid-mine drainage and acid-sulfate soils. In particular, arsenic speciation, arsenic loading, and pH should be considered when predicting and managing arsenic mobility in schwertmannite-rich systems.
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    Journal Title
    Environmental Science & Technology
    Volume
    43
    Issue
    24
    DOI
    https://doi.org/10.1021/es902461x
    Copyright Statement
    © 2009 American Chemical Society. Self-archiving of the author-manuscript version is not yet supported by this publisher. Please refer to the journal link for access to the definitive, published version or contact the authors for more information.
    Publication URI
    http://hdl.handle.net/10072/29992
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