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- W2073835791 abstract "The partition of tracer-level lanthanides, yttrium, and americium between various tri-n-butyl phosphate (TBP) phases and aqueous nitric acid phases has been studied radiometrically as a function of solvent concentration, nitric acid concentration, and Z. In undiluted TBP systems, a plot of log K vs. Z approximates two straight lines joining at Z = 64). The line for the high-Z region has a positive slope somewhat less than that of the line for the low-Z region at 18·5 M HNO3. This difference in slope becomes intesified as the concentration of nitric acid is lowered, the high-Z line ultimately acquiring a negative slope. The slope of the low-Z line remains positive throughout the region studied. This general half-filled shell effect is also noted for systems involving diluted TBP. It is postulated that the extracting species is [M(TBP)α(H2O)(χ−α)](NO3)3, in which α is a function of the nitric acid concentration and of Z. In all of the systems studied, for plotting purposes yttrium may be assigned an “apparent Z” of 65–68. In the dilute nitric acid systems, the americium plot is nearly coincident with that for praseodymium." @default.
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- W2073835791 date "1957-01-01" @default.
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- W2073835791 title "Nonmonotonic ordering of lanthanides in tributyl phosphate-nitric acid extraction systems" @default.
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- W2073835791 doi "https://doi.org/10.1016/0022-1902(57)80015-3" @default.
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