The physical separation of 22Na and 23Na Is realized when a mixture of these two Isotopes are used to reduce naphthalene (C10H() to Its anion radical. When (C10H8) dissolved In tetrahydrofuran Is exposed to a sodium metal mirror containing "Na, a competition for electrons exists between the Isotopes of the solvated sodium cation [*M(t) + C10H8*~,M+(tokl) ^M(<) + C10Ht*VM+(Mkl)]. After separation of the anion radical solution from the unoxldlzed metal, It was shown that the radioactive sodium Is concentrated In the anion radical phase (analysis via scintillation counting and atomic absorption).The separation factor (a) describing the room-temperature separation of 22Na from MNa Is 1.30 ± 0.02 (error reported as a standard deviation from five separate experiments). This value falls to 1.19 ± 0.05 when the reduction Is carried outIn the presence of 18-crown-6 and Is within experimental error of unity when the solvent Is dhnethoxyethane.
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