Extraction chromatography of noble metals with use of mixtures of hydrochloric and nitric acid as mobile phases.
The chromatographic behaviour of the platinum metals and gold, silver and copper on paper strips treated with liquid anion-exchangers and eluted with mixtures of HNO(3) and HCl was investigated. It was found that increase of HNO(3) concentration in the acid mixture increases the R(F) values more significantly than does that of HCl. The presence of HNO(3) in the development solution prevents the reduction of iridium(IV). The R(F) values of the noble metals increase in the order Au(III) < Os(IV) < Ir(IV) < Pt(IV) < Pd(II) < Ru(III) < Rh(III) approximately Ir(III). Several separations of noble metals were carried out on paper strips treated with trioctylamine or quaternary alkylammonium salts, as well as the column separation of the mixture PtPdRh. The proposed chromatographic systems seem to be especially useful for the separation of non-volatile noble metals.
Przeszlakowski
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Department of Inorganic and Analytical Chemistry, Medical School, 20-081 Lublin, Poland.
Flieger
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