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Thallium speciation and transformations: pathways, fates and risks.

Guangyuan Tu1, Qi Liao1,2, Weichun Yang1,2

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Summary
This summary is machine-generated.

Thallium (Tl) is highly toxic and its environmental fate depends on its chemical form and interactions with minerals. This review explains how Tl speciation, redox state, and environmental factors control whether Tl remains mobile or is sequestered.

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Area of Science:

  • Environmental Chemistry
  • Geochemistry
  • Toxicology

Background:

  • Thallium (Tl) is a highly toxic heavy metal.
  • Its environmental behavior is complex, influenced by speciation and redox reactions.
  • Understanding Tl's fate is crucial for environmental risk assessment.

Purpose of the Study:

  • To review the environmental behavior of thallium.
  • To link Tl speciation, interfacial processes, and environmental factors.
  • To identify research priorities for thallium risk appraisal and modeling.

Main Methods:

  • Literature review of thallium speciation and environmental behavior.
  • Analysis of factors influencing thallium mobility and sequestration.
  • Synthesis of biotic and abiotic interactions affecting thallium fate.

Main Results:

  • Dissolved thallium is typically Tl(I) in circumneutral waters.
  • Oxidized Tl(III) associates with mineral surfaces, especially manganese oxides.
  • Ligands and various mineral phases influence Tl partitioning, while biological processes create strong biotic-abiotic coupling.

Conclusions:

  • Environmental factors like pH, ligands, and mineralogy critically control thallium mobility versus sequestration.
  • In situ, species-resolved measurements and kinetic studies are needed.
  • Scalable interface representations are essential for predictive modeling and risk assessment.