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Related Experiment Videos

Analysis of plutonium in soil samples

Rubio Montero MP1, Martin Sanchez A, Crespo Vazquez MT

  • 1Departamento de Fisica, Universidad de Extremadura, Badajoz, Spain. pilar@unex.es

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|July 6, 2000
PubMed
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Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicineยท2000
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Anion exchange methods effectively purify plutonium in soil samples, crucial for accurate alpha spectrometry. Microwave digestion offers a faster alternative for routine plutonium analysis in diverse soil types.

Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Radiochemistry

Background:

  • Accurate determination of plutonium (Pu) in soil samples is essential for environmental monitoring and radiological assessments.
  • Interference from 228Th can affect the precise measurement of 238Pu using alpha spectrometry.
  • Efficient extraction and purification methods are required for reliable plutonium analysis in complex matrices like soil.

Purpose of the Study:

  • To develop and compare anion exchange methods for purifying plutonium in soil samples.
  • To optimize procedures for removing interfering 228Th during plutonium determination.
  • To evaluate different soil digestion techniques for plutonium extraction.

Main Methods:

  • Development of anion exchange chromatography for plutonium purification.

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  • Comparison of direct nitric acid digestion versus microwave-assisted digestion (HNO3, HCl, HF) for soil sample preparation.
  • Determination of plutonium isotopes using alpha spectrometry.
  • Validation using a natural reference soil matrix.

    • Main Results:

    • Anion exchange effectively purified plutonium and removed interfering 228Th.
    • Direct digestion is suitable for large soil samples, while microwave digestion is faster for routine analysis.
    • Plutonium activities determined in the reference soil matrix showed good agreement with the reference value.
    • Recoveries for plutonium using the microwave digestion method in various soil samples ranged from 20% to 50%.

    Conclusions:

    • Anion exchange is a reliable technique for plutonium purification in soil analysis.
    • Microwave digestion provides a time-efficient method for routine plutonium extraction from soil.
    • The developed methods are suitable for accurate plutonium determination in environmental soil samples, though recoveries may vary.