PLUTONIUM(IV) AND PLUTONIUM(VI) EXTRACTION BY 1-HYDROXY-6-N-OCTYLCARBOXAMIDE-2(1H)-PYRIDINONE*

* Work supported by the U.S. Department of Energy Office of Environmental Management, Office of Science and Technology (EM-50) and performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under contract number W-7405-ENG-48

ABSTRACT

Extraction of Pu(IV) and Pu(VI) from nitric acid media by the promising new extractant l-hydroxy-6-N-octylcarboxamide-2(1H)-pyridinone (octyl-1,2-HOPO) has been investigated. The effects of nitric acid, sodium, aluminum and iron(III) nitrates on extraction have been examined. Octyl-1,2-HOPO exhibits high specificity for Pu(IV) over a wide range of acidity and ionic strength. The affinity of octyl-1,2-HOPO for Pu(VI) is much less than for Pu(IV). However, the extraction of Pu(VI) is possible from acidic as well as from highly salted media. Two water soluble ligands, 1-hydroxyethane-1,1,-diphosphonic acid (HEDPA) and H(2,2)-1,2-HOPO, have been shown to be very effective for back extraction.

Notes

* Work supported by the U.S. Department of Energy Office of Environmental Management, Office of Science and Technology (EM-50) and performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under contract number W-7405-ENG-48