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The extraction of septivalent rhenium into tributyl phosphate from aqueous nitric acid has been investigated as a function of solvent concentration in the organic, and nitric acid concentration in the aqueous phase, the rhenium concentration being kept constant. The method of continuous variations has been applied to follow the formation of the extractable rhenium compound. The results revealed that perrhenic acid was the only extractable species. The solvent-dependencies have been found to be of the direct fourth-power. The mass-action effect and the anti-synergic interaction between nitric and perrhenic acid have been used to interpret the extraction mechanism involved. An attempt has been made to calculate the formation constant of perrhenic acid tetrasolvate.DURING work in this laboratory on solute-solvent interactions in heterogeneous ternary systems containing aqueous mineral acids and tributyl phosphate? an attempt has been (a)

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