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Related Experiment Videos

Accelerated volatilization rates of selenium from different soils.

A Stork1, W A Jury, W T Frankenberger

  • 1Department of Environmental Sciences, University of California, Riverside 92521, USA.

Biological Trace Element Research
|September 1, 1999
PubMed
Summary

Soil amendments like zein and L-methionine can enhance selenium volatilization, a key process for removing toxic selenium from soils. This study explored different amendments to improve this natural remediation method.

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Area of Science:

  • Environmental Science
  • Soil Science
  • Biogeochemistry

Background:

  • Selenium (Se) is a naturally occurring element that can accumulate to toxic levels in irrigated soils.
  • Soil microorganisms can volatilize selenium (Se) into dimethylselenide (DMSe), offering a potential remediation pathway.
  • Understanding soil amendments that enhance this volatilization is crucial for managing selenium contamination.

Purpose of the Study:

  • To investigate the efficacy of different soil amendments in enhancing selenium volatilization from various soil types.
  • To determine the optimal amendments for promoting gaseous selenium emissions as a soil remediation strategy.

Main Methods:

  • Laboratory study using six different soils spiked with 75SeO3(2-).
  • Tested amendments included two amino acids (DL-homocysteine, L-methionine), a carbohydrate (pectin), and a protein (zein).

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  • Gaseous 75Se emissions were quantified using activated carbon trapping and gamma counting.

    • Main Results:

    • Selenium volatilization varied significantly by soil type, ranging from 1.2% to 9.0% in controls.
    • Zein and L-methionine amendments markedly increased selenium volatilization, reaching up to 43% of applied Se.
    • Pectin showed a moderate, sustained effect on volatilization rates, while DL-homocysteine had a minor impact.

    Conclusions:

    • Zein and L-methionine are highly effective soil amendments for enhancing selenium volatilization.
    • The effectiveness of amendments and soil response to them are soil-specific.
    • Enhanced selenium volatilization presents a promising bioremediation approach for contaminated soils.