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Tungsten metal rapidly oxidizes to soluble hexavalent tungsten(VI) in soils. Weak adsorption and formation of polyoxometalates increase tungsten solubility and potential transport in contaminated environments.

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Area of Science:

  • Environmental Chemistry
  • Geochemistry
  • Soil Science

Background:

  • Tungsten (W) geochemistry in natural systems remains poorly understood.
  • Key questions involve tungsten speciation in soils and adsorption's role in dissolved concentrations.

Purpose of the Study:

  • To investigate tungsten speciation and solubility in soils from firing ranges.
  • To characterize tungsten partitioning behavior between soil solid and solution phases.

Main Methods:

  • X-ray absorption spectroscopy and X-ray microprobe for tungsten characterization.
  • Desorption isotherms to determine solid-solution partitioning.

Main Results:

  • Complete and rapid oxidation of tungsten metal to hexavalent tungsten(VI).
  • Prevalence of adsorbed polymeric tungstates, not discrete mineral phases.
  • High dissolved tungsten concentrations (850 mg L⁻¹) due to weak adsorption.

Conclusions:

  • Tungsten solubility is significantly enhanced by polyoxometalate formation, such as α-Keggin clusters.
  • These findings suggest increased tungsten mobility and potential toxicity in contaminated soils.
  • Further research is needed to identify specific soil polyoxometalates and confirm their impact.