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Thioarsenates in sulfidic waters.

S Stauder1, B Raue, F Sacher

  • 1DVGW-Technologiezentrum Wasser, Karlsruher Strasse 84, 76139 Karlsruhe, Germany. stauder@tzw.de

Environmental Science & Technology
|September 22, 2005
PubMed
Summary
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Thioarsenates, not previously expected, form in reducing environments, altering arsenic mobility and toxicity. This discovery offers new avenues for arsenic remediation in sulfidic aquifers.

Area of Science:

  • Environmental Chemistry
  • Geochemistry
  • Analytical Chemistry

Background:

  • Soluble arsenic-sulfur complexes influence arsenic mobility and toxicity in sulfate-reducing environments.
  • Understanding arsenic speciation is crucial for managing arsenic in sulfidic aquifers and designing remediation strategies.
  • Previously, monomeric and trimeric thioarsenites were considered the primary arsenic species in sulfidic systems.

Purpose of the Study:

  • To identify arsenic species in sulfidic environments.
  • To investigate the unexpected oxidation of arsenic(III) to arsenic(V) in thioarsenates under reducing conditions.
  • To evaluate the implications of thioarsenate formation for arsenic mobility, toxicity, and remediation.

Main Methods:

  • Ion Chromatography-Inductively Coupled Plasma/Mass Spectrometry (IC-ICP/MS) was used for arsenic species identification.

Related Experiment Videos

  • Analysis was performed on arsenite- and sulfide-containing solutions.
  • Reduced groundwater samples from a contaminated site were analyzed.

    • Main Results:

    • Thioarsenates were identified in arsenite- and sulfide-containing solutions and in reduced groundwater.
    • Arsenic(III) was unexpectedly oxidized to arsenic(V) in thioarsenates within strongly reducing systems.
    • Arsenic(III) disproportionation to thioarsenates and elemental arsenic was observed in sulfide-containing solutions without oxidants.

    Conclusions:

    • The formation of thioarsenates challenges previous assumptions about arsenic speciation and behavior in sulfidic environments.
    • Thioarsenate formation may decrease arsenic mobility and toxicity in sulfidic waters, contrary to expectations for decreasing redox states.
    • Thioarsenates present potential for novel remediation strategies but require careful handling due to their sensitivity to oxygen and pH during analysis.