TBP, Plutonium/Third phase forrmtion llonic strength jn-dodecarte /Shellsol-T Summaiy Third phase formation in the extraction of plutonium(IV) by tri-n-butyl phosphate (TBP) in n-dodecane (DD) and Shellsol-T (SST) was studied. The effect of ionic strength on the limiting organic concentration (LOC) in Pu(N03)4 /30% TBP/DD system was studied and the LOC was found to increase nearly linearly with aqueous phase ionic strength. Data for the LOC of plutoniurndV) in 15% TBP/SST, 30% TBP/SST and 30% TBP/DD as a function of equilibrium aqueous phase acidity indicate, as expected, a mach higher solubility of the Pu(N03 )< • 2 TBP complex in SST than in DD.

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