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Separation Science and Technology, Vol.35, No.1, 153-168, 1999
Extraction of ruthenium(IV) from hydrochloric acid medium with N-octylaniline and its determination spectrophotometrically with pyrimidine-2-thiol
A novel method is proposed for the extraction of microgram level concentrations of ruthenium(IV) from halide medium with N-octylaniline dissolved in xylene as an extractant. The optimum conditions have been determined by making a critical study of acid concentration, extractant concentration, period of equilibration, and effect of solvent on the equilibria. The ruthenium(IV) from the organic phase is stripped with sodium chloride solution and determined spectrophotometrically with pyrimidine-2-thiol as a reagent. The method affords the binary separation of ruthenium(IV) from base metals such as iron(III), cobalt(II), nickel(II), and copper(II), and it is used for analysis of synthetic mixtures of associated metal ions and alloys. It can be successfully applied for the separation and determination of ruthenium(IV) from the constituent elements of a fuel used for Experimental Breeder Reactor II. The method is highly selective, simple, and reproducible.