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Related Experiment Videos

Selenium speciation in kerogen from two Chinese selenium deposits: environmental implications.

Hanjie Wen1, Jean Carignan, Yuzhuo Qiu

  • 1Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002 China. hjwen@crpg.cnrs-nancy.fr

Environmental Science & Technology
|April 1, 2006
PubMed
Summary

Selenium speciation in Chinese ore deposits reveals diverse chemical forms. Elemental selenium nanograins in Yutangba, linked to redox conditions, are mobilized and accumulated by vegetation, explaining local selenium poisoning.

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Area of Science:

  • Geochemistry
  • Environmental Science
  • Mineralogy

Background:

  • Selenium is an essential trace element with significant environmental implications.
  • Se-bearing deposits in China, like Laerma and Yutangba, show recent discoveries.
  • Previous studies linked selenium to organic matter, but detailed speciation and formation mechanisms were unclear.

Purpose of the Study:

  • To identify and characterize different selenium (Se) chemical forms and their relationships with kerogen in Chinese Se-rich deposits.
  • To understand the diversity of Se formation mechanisms and chemical states.
  • To assess the potential mobility and bioavailability of different Se species during rock weathering.

Main Methods:

  • Extraction of kerogen samples from ore rocks.

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  • Analysis using transmission electron microscopy (TEM).
  • Geochemical techniques including infrared spectra (IS) and X-ray diffraction (XRD).

    • Main Results:

    • Observed organically bound Se in the Laerma deposit.
    • Identified elemental Se nanograins associated with kerogen in the Yutangba deposit.
    • Proposed formation mechanisms: redox conditions for elemental Se and S-Se substitution for organic Se species.

    Conclusions:

    • Selenium speciation in ore deposits is diverse, influencing its environmental behavior.
    • Elemental Se in altered rocks is mobilized and can be accumulated by vegetation, potentially causing poisoning.
    • Organically bound Se appears more stable and less bioavailable.