Separation of the non-volatile noble metals by reversed-phase extraction chromatography.
The procedure involves the use of tri-n-butyl phosphate (TBP) adsorbed by Porasil C and stepwise elution with sulphuric acid and hydrochloric acid. The distribution coefficients for the two systems (TBP and hydrochloric acid and TBP and sulphuric acid) and the elution characteristics were studied. A description is given of a procedure applicable to the analysis of prills obtained from the fire assay of platinum-bearing ores.
Anion-exchange behaviour of the platinum metals and gold in hydrochloric acid-organic solvent media.
The anion-exchange characteristics of the platinum metals and gold in hydrochloric acid media are described. The distribution coefficients of these elements were measured on the strongly basic anion-exchange resin Dowex 1 x 8 in mixtures of hydrochloric acid with water and several organic solvents, i.e., dimethylformamide, acetone, tetrahydrofuran, dioxan, methanol, acetic acid and pyndine. Based on these data the conditions most suitable for quantitative separation are indicated and discussed.
Use of ion exchange resins with nonaqueous and mixed solvents
This review examines some of the recent developments in the use of synthetic ion exchangers for three types of separations: the separation of ionic substances in nonaqueous or mixed solvents, the separation of nonionic substances in nonaqueous or mixed solutions, and the separation of ionic from nonionic materials in solution.