Determination of Technetium-99 in Environmental Samples by Solvent Extraction at Controlled Valence

Q.J. Chen, A. Aarkrog, H. Dick, K. Mandrup

    Research output: Book/ReportReport

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    Abstract

    Distribution coefficients of technetium and ruthenium are determined under different conditions with CCl4, cyclohexanone, and 5% tri-isooctylasine (TIOA)/xylene. A method for analyzing 99Tc in environmental samples has been developed by solvent extraction in which the valences of technetium and ruthenium are controlled with H2O2, and NaC10. Technetium and ruthenium which are oxidized to TcO-4 and RuO-4 by NaC10 are separated by extraction with CC14 at pH=4. The RuO-4 is reduced to low valence and technetium is kept in the TcO-4 state with H2O2. Technetium, ruthenium, and other nuclides are subsequently separated by solvent extraction with cyclohexanone and 5% TIOA/xylene. The decontamination of the procedure is 1.35 x 105 for 103Ru and 1.66 x 105 for 1l0mAg. The chemical yield of technetium-99 is 55%.
    Original languageEnglish
    Place of PublicationRoskilde
    PublisherRisø National Laboratory
    Number of pages31
    ISBN (Print)87-550-1368-6
    Publication statusPublished - 1987
    SeriesRisø-M
    Number2671
    ISSN0418-6435

    Keywords

    • Risø-M-2671

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