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Related Experiment Videos

Selenium determination in biological fluids using Zeeman background correction electrothermal atomic absorption

N Campillo1, P Viñas, I López-García

  • 1Department of Analytical Chemistry, University of Murcia, Murcia, E-30071, Spain.

Analytical Biochemistry
|May 3, 2000
PubMed
Summary

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Directly measure total selenium in biological samples using electrothermal atomic absorption spectrometry. This method offers accurate and reliable results for urine, serum, and blood selenium levels.

Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Environmental Science

Background:

  • Accurate determination of total selenium is crucial for health and environmental monitoring.
  • Existing methods may lack sensitivity or require complex sample preparation.
  • Electrothermal atomic absorption spectrometry (ETAAS) offers high sensitivity for trace element analysis.

Purpose of the Study:

  • To develop and validate direct methods for total selenium determination in biological matrices.
  • To establish reliable analytical procedures for urine, serum, and blood samples.
  • To assess the performance and accuracy of the developed ETAAS methods.

Main Methods:

  • Direct sample introduction into an electrothermal atomizer with Zeeman background correction.

Related Experiment Videos

  • Use of Triton X-100 for sample dilution and stabilization.
  • Inclusion of hydrogen peroxide, nitric acid, and nickel (or palladium) as chemical modifiers.
  • Calibration via standard additions or aqueous standards (with palladium).

    • Main Results:

    • Detection limits of 30 pg (nickel modifier) and 45 pg (palladium modifier) selenium.
    • High accuracy demonstrated by mean recoveries: 99.7% (serum), 99.4% (urine), 100.8% (blood).
    • Low relative standard deviations: +/-4.0% (serum), +/-3.9% (urine), +/-4.5% (blood).

    Conclusions:

    • Direct ETAAS methods provide accurate and precise quantification of total selenium in biological samples.
    • Zeeman correction is essential for reliable measurements due to high background signals.
    • The validated procedures are suitable for routine clinical and research applications.