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SummaryThe extraction behaviour of Np(IV) by 3-phenyl-4-acetyl-5-isoxazolone (HPAI) was investigated from nitric acid medium in the presence of tri-

The extraction of Au(III) from an aqueous acidic medium with N-(thioacetyl)benzamide in chloroform was studied in the presence of organophosphorus donors (tributylphosphine oxide, triphenylphosphine oxide, tributyl phosphate) at pH 3.0 using radiotracer technique. The influence of various parameters on the extraction equilibrium was examined. The extent of extraction of Au(III) in the form of the binary complex increases with temperature, but the reverse trend is observed with the ternary complex. The overall equilibrium constants for each of the three ternary extraction systems were estimated, and the role of different thermodynamic functions is discussed. The extraction mechanism is supported by the IR spectra of the ternary adduct.

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