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Related Concept Videos

Speciation Rates01:07

Speciation Rates

Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.

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Selenium speciation analysis at trace level in soils.

Julie Tolu1, Isabelle Le Hécho, Maïté Bueno

  • 1Laboratoire de Chimie Analytique Bio-Inorganique et Environnement (LCABIE), Université de Pau et des Pays de l'Adour/CNRS, UMR 5254, IPREM, Hélioparc, 2 Avenue du Président Angot, 64053 Pau Cedex 9, France. julie.tolu@etud.univ-pau.fr

Analytica Chimica Acta
|December 21, 2010
PubMed
Summary

This study developed a new method to analyze selenium (Se) speciation in soils. The technique accurately identifies different forms of selenium, crucial for understanding its mobility and environmental impact.

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Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Soil Science

Background:

  • Selenium speciation is critical for understanding its environmental fate and bioavailability.
  • Accurate determination of trace-level selenium in soils requires robust analytical methods.

Purpose of the Study:

  • To develop and validate a sensitive analytical methodology for selenium speciation in soils at trace levels.
  • To assess selenium mobility by determining its distribution among different soil fractions.

Main Methods:

  • Parallel single extractions using ultrapure water, phosphate buffer, and sodium hydroxide.
  • High-performance liquid chromatography hyphenated to inductively coupled plasma mass spectrometry (HPLC-ICPMS).
  • Utilized two complementary chromatographic separations for species identification and confirmation.

Main Results:

  • Achieved detection limits for selenium species from 3 to 29 ng(Se)L(-1) in extracts and 0.1 to 10 μg(Se)kg(-1) in soils.
  • The chosen extractants effectively recovered selenium while preserving species integrity.
  • Successfully applied the methodology to soils with total selenium concentrations ranging from 210 to 1560 μg(Se)kg(-1).

Conclusions:

  • The developed HPLC-ICPMS methodology enables accurate determination of selenium speciation in soils at trace concentrations.
  • This method provides valuable insights into selenium mobility and its association with soil components.
  • The approach is suitable for analyzing native selenium levels in diverse soil types.