Selective Permeation of Plutonium (IV) through a Supported Liquid Membrane Containing Tri-iso-amyl Phosphate as an Ionophore
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Selective ionophoric mobility of plutonium with ease of concentration upgradation from aqueous nitrate solutions was investigated. A thin flat-sheet supported liquid membrane (SLM) impregnated with tri-iso-amyl phosphate (TAP) was used. Accurel polypropylene hydrophobic microporous membrane 'Enka' was tested as the solid polymeric support. The source phase generally contained extremely dilute (ca. 10<SUP>-6</SUP>mol/dm<SUP>-3</SUP>) to moderately concentrated plutonium(IV) nitrate solutions (ca. 10<SUP>-3</SUP>mol/dm<SUP>-3</SUP>) in about 4mol/dm<SUP>-3</SUP> HNO<SUB>3</SUB>. Membrane permeability and selectivity dependency on variables like nitric acid concentration in the source phase, carrier concentration, receiving phase composition, etc. were systematically evaluated. More than 90% pertraction of plutonium could be easily accomplished in single run employing a feed solution consisting of about 1mg/dm<SUP>-3</SUP> Pu and 4mol/dm<SUP>-3</SUP> HNO<SUB>3</SUB>, carrier concentration of 0.8mol/dm<SUP>-3</SUP> TAP/dodecane; the receiving phase was 0.5mol/dm<SUP>-3</SUP> sodium carbonate or 0.5mol/dm<SUP>-3</SUP> ascorbic acid. The selective diffusivity of plutonium(IV) was observed from various effluents originating from fuel reprocessing operations. Reusability of membrane supports was also found to be satisfactory.
- Journal of Nuclear Science and Technology
Journal of Nuclear Science and Technology 35(6), 419-424, 1998-06-25
Atomic Energy Society of Japan