Abstract
A previous method for the determination of equilibrium constants of extraction processes has been simplified without decreasing the accuracy of the determination. The method has been applied to the extraction of thorium nitrate with tri-n-butyl phosphate. Formation of a 1:3 adduct of thorium nitrate with the phosphate has been established and the formation constant, log K= 3.43, determined. The influence of diluents on this constant is considered.

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