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Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films
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Precise determination of plutonium in nuclear fuel process samples.

K Dhamodharan1, Satya Narayan Das2, D Sivakumar2

  • 1Reprocessing Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India. kdn@igcar.gov.in.

Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry
|March 22, 2022
PubMed
Summary

A new REDOX-based method accurately determines plutonium concentration by leveraging oxidation and reduction steps. This analytical technique offers reliable results with minimal interference for plutonium determination.

Keywords:
Ceric nitrateFast reactorHigh burn upPlutonium determinationRedox titration

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Area of Science:

  • Analytical Chemistry
  • Nuclear Chemistry

Background:

  • Accurate determination of plutonium concentration is crucial for nuclear fuel reprocessing and waste management.
  • Existing analytical methods may face interferences from complex matrices, such as those found in PUREX process streams.

Purpose of the Study:

  • To develop and validate a robust REDOX-based analytical method for precise plutonium concentration determination.
  • To assess and mitigate potential interferences from common PUREX process stream components and analytical reagents.

Main Methods:

  • Plutonium was oxidized to the +6 oxidation state using ceric ammonium nitrate.
  • Ceric(IV) interference was suppressed by reducing it to ceric(III) with sodium nitrite.
  • Hexavalent plutonium was reduced to tetravalent, and unreacted ferrous ammonium sulfate was quantified via dichromate titration to determine plutonium concentration.

Main Results:

  • The developed REDOX method effectively determines plutonium concentration.
  • Interference studies confirmed the method's applicability in the presence of tri-n-butyl phosphate, uranium, and other reagents.
  • The method achieved a relative standard deviation within ±1.0% for plutonium concentrations ranging from 0.7-2.5 mg.

Conclusions:

  • A reliable REDOX-based analytical method for plutonium determination has been established.
  • The method demonstrates good precision and accuracy, with effective management of potential interferences.
  • This technique is suitable for analyzing plutonium concentrations in complex chemical environments like PUREX process streams.