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  • Antimony and arsenic exhibit contrasting spatial distributions in the sediment and vegetation of a contaminated wetland

    Author(s)
    Warnken, Jan
    Ohlsson, Rohana
    Welsh, David T
    Teasdale, Peter R
    Chelsky, Ariella
    Bennett, William W
    Griffith University Author(s)
    Warnken, Jan
    Welsh, David T.
    Bennett, Will W.
    Ohlsson, Rosie R.
    Chelsky, Ariella
    Teasdale, Peter R.
    Year published
    2017
    Metadata
    Show full item record
    Abstract
    Antimony is a priority environmental contaminant that is relatively poorly studied compared to other trace metal(loid)s. In particular, the behaviour of antimony in wetland sediments, where anaerobic conditions often dominate, has received considerably less attention compared to well-drained terrestrial soil environments. Here we report the results of a spatial assessment of antimony in the sediments and vegetation of a freshwater wetland exposed to stibnite tailings for the past forty years. The concentration of antimony in the sediment decreased rapidly with distance from the tailings deposit, from a maximum of ∼22,000 mg ...
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    Antimony is a priority environmental contaminant that is relatively poorly studied compared to other trace metal(loid)s. In particular, the behaviour of antimony in wetland sediments, where anaerobic conditions often dominate, has received considerably less attention compared to well-drained terrestrial soil environments. Here we report the results of a spatial assessment of antimony in the sediments and vegetation of a freshwater wetland exposed to stibnite tailings for the past forty years. The concentration of antimony in the sediment decreased rapidly with distance from the tailings deposit, from a maximum of ∼22,000 mg kg−1 to ∼1000 mg kg−1 at a distance of ∼150 m. In contrast, arsenic was distributed more evenly across the wetland, indicating that it was more mobile under the prevailing hypoxic/anoxic conditions. Less clear trends were observed in the tissues of wetland plants, with the concentrations of antimony in waterlilies (2.5–195 mg kg−1) showing no clear trends with distance from the tailings deposit, and no correlation with sediment concentrations. Sedges and Melaleuca sp. trees had lower antimony concentrations (<25 mg kg−1 and 5 mg kg−1, respectively) compared to waterlilies, but showed a non-significant trend of higher concentrations closer to the tailings. For all vegetation types sampled, antimony concentrations were consistently lower than arsenic concentrations (Sb:As = 0.27–0.31), despite higher concentrations of antimony in the sediment. Overall, the results of this study highlight clear differences in the behaviour of antimony and arsenic in freshwater wetlands, which should be considered during the management and remediation of such sites
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    Journal Title
    Chemosphere
    Volume
    180
    DOI
    https://doi.org/10.1016/j.chemosphere.2017.03.142
    Grant identifier(s)
    DE140100056
    Subject
    Environmental assessment and monitoring
    Publication URI
    http://hdl.handle.net/10072/375666
    Collection
    • Journal articles

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