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Solid-solution reactions in As(V) sorption by schwertmannite.

Keisuke Fukushi1, Tsutomu Sato, Nobuyuki Yanase

  • 1Division of Global Environmental Science and Engineering, Graduate School of Natural Science and Technology, and Institute of Nature and Environmental Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan.

Environmental Science & Technology
|September 5, 2003
PubMed
Summary

Arsenic(V) sorption onto schwertmannite follows solid-solution reactions, where arsenic replaces sulfate. This process stabilizes schwertmannite, inhibiting its transformation into goethite, crucial for acid mine drainage remediation.

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Area of Science:

  • Environmental Chemistry
  • Geochemistry
  • Mineralogy

Background:

  • Schwertmannite is a metastable iron oxyhydroxy-sulfate mineral.
  • Arsenic contamination in water bodies is a significant environmental concern.
  • Understanding arsenic sorption mechanisms is vital for water treatment and remediation.

Purpose of the Study:

  • To investigate the sorption behavior of Arsenic(V) (As(V)) by synthesized schwertmannite.
  • To elucidate the solid-solution reactions governing As(V) sorption.
  • To assess the impact of As(V) sorption on schwertmannite stability.

Main Methods:

  • Sorption experiments conducted at pH 3.3 with varying initial As(V) concentrations.
  • Analysis of solution chemistry to determine released sulfate and hydroxyl ions.

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  • Interpretation of results using solid-solution reaction models.

    • Main Results:

    • Schwertmannite releases sulfate and hydroxyl ions during As(V) sorption.
    • As(V) substitutes for sulfate in the schwertmannite structure, up to 50% of total sulfate.
    • A quantitative solid-solution relationship was established between As(V)-free and As(V)-rich schwertmannite.

    Conclusions:

    • As(V) sorption on schwertmannite can be described by solid-solution reactions.
    • Sorption of As(V) stabilizes schwertmannite, inhibiting its transformation to goethite.
    • The findings are applicable to understanding arsenic behavior in acid mine drainage and engineered systems.