Separation and determination of Pt(II), Rh(III), Pd(II), Os(IV), Ni(II) and Co(II) complexes by reversed-phase liquid chromatography

Abstract

The use of 2-(6-methyl-2-benzothiazolylazo)-5-diethylaminophenol as a chelating reagent in the reversed-phase liquid chromatographic separation and determination of Pt, Rh, Pd, Os, Ni and Co is reported. A precolumn derivatization method followed by separation on an ODS column with methanol- n-butanol-water (70+5+25) containing 5 mmol 1 −1 tetrabutylammonium bromide, 0.5 mmol l −1 ethylenediaminediacetic acid diethyl acetate and 20 mmol l −1 acetate buffer (pH 4.5) was used. The detection limits for Pt, Rh, Pd, Os, Ni and Co are 1.5, 0.54, 0.6, 1.0, 0.1 and 0.1 ng ml −1, respectively, with a signal-to-noise ratio of 3. The analyses of a reference sample of noble metals and anode slime are reported. The results corresponded with the certified values, and 94.7–104% recoveries were obtained.