Procedures for determination of 239,240Pu, 241Am, 237Np, 234,238U, 228,230,232Th, 99Tc and 210Pb-210Po in environmental materials

Q.J. Chen, Asker Aarkrog, Sven Poul Nielsen, Henning Dahlgaard, B. Lind, A.K. Kolstad, Yixuan Yu

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    Abstract

    A procedure for the determination of plutonium in seawater is described. The
    plutonium is pre-concentrated by scavenging with Fe(OH)2 and Fe(OH)3 .This purifies for Ca2+, Mg2+ and amphoteric elements. The method is based on a new procedure in which the principle of controlled valence is applied. The redox system SO32- / NO2- was used (1) first to reduce to Pu3+ and afterwards to oxidize to Pu4+. The Pu3+ is separated from U and 210 Po by solvent extraction with TIOA – 6-10 M HCl. Followed by anion exchange of Pu4+ in 8 M HNO3. The decontamination factors of the procedure are >1.7 ⋅ 106 for U and >6.3 ⋅ 104 for Th. The chemical yield is 70-85%.
    Original languageEnglish
    Place of PublicationRoskilde
    PublisherRisø National Laboratory
    Number of pages33
    ISBN (Print)87-550-2966-3
    ISBN (Electronic)87-550-2966-3
    Publication statusPublished - 2001
    SeriesDenmark. Forskningscenter Risoe. Risoe-R
    Number1263(EN)
    ISSN0106-2840

    Keywords

    • Risø-R-1263
    • Risø-R-1263(EN)

    Fingerprint Dive into the research topics of 'Procedures for determination of <sup>2</sup><sup>3</sup><sup>9</sup><sup>,</sup><sup>2</sup><sup>4</sup><sup>0</sup>Pu, <sup>2</sup><sup>4</sup><sup>1</sup>Am, <sup>2</sup><sup>3</sup><sup>7</sup>Np, <sup>2</sup><sup>3</sup><sup>4</sup><sup>,</sup><sup>2</sup><sup>3</sup><sup>8</sup>U, <sup>2</sup><sup>2</sup><sup>8</sup><sup>,</sup><sup>2</sup><sup>3</sup><sup>0</sup><sup>,</sup><sup>2</sup><sup>3</sup><sup>2</sup>Th, <sup>9</sup><sup>9</sup>Tc and <sup>2</sup><sup>1</sup><sup>0</sup>Pb-<sup>2</sup><sup>1</sup><sup>0</sup>Po in environmental materials'. Together they form a unique fingerprint.

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