Abstract
The extraction of septivalent rhenium into tributyl phosphate from aqueous nitric acid is 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 is applied to follow the formation of the extractable rhenium compound. The results revealed that perrhenic acid was the only extractable species. The solvent-dependencies are found to be of the direct fourth-power. The mass- action effect and anti-synergic interation between nitric and perrhenic acid are used to interpret the extraction mechanism involved. An attempt is made to calculate the formation constant of perrhenic acid tetrasolvate. (auth)
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