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Related Experiment Videos

Selenium extractability from a contaminated fine soil fraction: implication on soil cleanup.

Teik-Thye Lim1, Kok-Hui Goh

  • 1Environmental Engineering Research Centre, School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore. cttlim@ntu.edu.sg

Chemosphere
|November 4, 2004
PubMed
Summary

This study investigated selenium (Se) extraction from acidic soils. Sodium salts and oxidants were tested, with oxidants like hydrogen peroxide and potassium permanganate proving most effective for selenium removal.

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Chemosphere·2022

Area of Science:

  • Environmental Chemistry
  • Soil Science
  • Geochemistry

Background:

  • Selenium (Se) contamination in soils poses environmental risks.
  • Understanding selenium speciation and mobility is crucial for remediation.
  • Acidic soils present unique challenges for selenium remediation.

Purpose of the Study:

  • To evaluate the effectiveness of various chemical reagents for extracting selenite (Se(IV)) and selenate (Se(VI)) from aged acidic soils.
  • To compare the extraction efficiencies of different sodium salts and oxidants.
  • To determine the most suitable kinetic models for selenium extraction.

Main Methods:

  • Soil contamination with Se(IV) and Se(VI), followed by aging.
  • Speciation analysis using hydride generation atomic absorption spectrometry (HGAAS).

Related Experiment Videos

  • Selective sequential extraction to fractionate retained Se.
  • Evaluation of extraction efficiencies of NaCl, Na2SO4, Na2CO3, Na3PO4, H2O2, and KMnO4.

    • Main Results:

    • Sodium salts (NaCl, Na2SO4, Na2CO3) primarily extracted exchangeable Se, while Na3PO4 also extracted strongly-bound fractions.
    • Selenate (Se(VI)) was extracted more effectively than selenite (Se(IV)) by the tested salts.
    • Oxidants H2O2 and KMnO4 extracted >93% of total Se, demonstrating significantly higher efficiency than salts.
    • Elovich and Ritchie second-order models best described Se(IV) and Se(VI) extraction kinetics, respectively.

    Conclusions:

    • Oxidants are highly effective for removing both selenite and selenate from contaminated acidic soils.
    • The choice of extraction reagent significantly impacts the fraction of selenium removed.
    • Kinetic modeling provides insights into the mechanisms of selenium extraction from soils.