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Integrated Field Lysimetry and Porewater Sampling for Evaluation of Chemical Mobility in Soils and Established Vegetation
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Biochar Soil Amendment Effects on Arsenic Availability to Mountain Brome ().

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    Biochar amendments can help remediate arsenic-contaminated mine sites. This study found biochar increased mountain brome root biomass and reduced arsenic uptake in plants.

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    Area of Science:

    • Environmental Science
    • Soil Science
    • Bioremediation

    Background:

    • Mine sites often contain arsenic (As), a toxic contaminant.
    • Biochar, a byproduct of renewable energy production, is a potential soil amendment for remediation.
    • Mountain brome is a plant species found at mine sites.

    Purpose of the Study:

    • To investigate the effects of biochar on arsenic concentrations in mountain brome grown in contaminated soil.
    • To understand how biochar affects plant biomass and arsenic uptake.
    • To analyze arsenic speciation and bioavailability in biochar-amended soils.

    Main Methods:

    • Greenhouse experiment with mine-contaminated soil amended with biochar.
    • Cultivation of mountain brome in amended and unamended soils.
    • Analysis of plant biomass (root and shoot).
    • Measurement of arsenic concentrations in plant tissues.
    • X-ray absorption near-edge structure (XANES) spectroscopy for arsenic speciation.
    • Soil extraction tests to assess phosphate and arsenate availability.

    Main Results:

    • Biochar amendment resulted in increased root biomass of mountain brome.
    • Arsenic concentrations in both roots and shoots of mountain brome were decreased in biochar-amended soil.
    • Arsenate [As(V)] was the dominant arsenic species in both soil treatments.
    • Soil extraction tests did not accurately predict plant arsenic concentrations, indicating distinct bioavailability.

    Conclusions:

    • Biochar is a promising amendment for remediating arsenic-contaminated mine soils.
    • Biochar can reduce arsenic uptake by plants like mountain brome.
    • The bioavailability of arsenate in these soils differs from phosphate, necessitating specific remediation strategies.