Selective Spectrophotometric Determination of Osmium in Aqueous Iodide Solutions or after Extraction with Trioctylamine-Carbon Tetrachloride.
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Osmium and ruthenium can be selectively isolated from a mixture of the noble metals by distillation in the form of OsO4 and RuO4. In hydrochloric (or sulfuric) acid media and in the presence of iodide, OsO4 is selectively reduced to osmium(IV) and the OsI62- complex is formed. Quantitative conversion of Os(VIII) into this complex takes place in 0.8M I- solutions and in 0.04M HCl (or 0.1M H2SO4) within 5 (or 10min), respectively. The OsI62- complex reacts with trioctylamine ((C8H17)3N) and the ion associate ((C8H17)3NH+)2OsI62- is formed. The ion associate can be isolated from aqueous solutions by extraction into carbon tetrachloride. Both the OsI62- complex and the ion pair with trioctylamine can be used for spectrophotometric determination of osmium directly in aqueous solutions or after extraction into the organic solvent. Ruthenium does not interfere with the determination of osmium in the form of the OsI62- complex.
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