Rhodium/III/ solutions react with tin/II/ chloride to form a short-lived yellow complex which is extracted by polyurethane foam. Iridium/IV/ solutions are decolourised by tin/II/ chloride but the metal is poorly extracted by foam. The rhodium/III/ complex is readily desorbed from foam using hydrochloric acid and acetone.
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Bowen, H.J.M., Leach, A.J. Partial separation of rhodium and iridium using polyurethane foam. Journal of Radioanalytical and Nuclear Chemistry Letters 128, 103–107 (1988). https://doi.org/10.1007/BF02177006
- Physical Chemistry
- Inorganic Chemistry