engleski

Solvent Extraction of Ruthenium(III) as a Thiocyanate Complex

The extraction of ruthenim (III) as a thiocyanate complex from hydrochloric acid solution with tetraphenylarsonium (TPA), tetraphenylphosphonium (TPP) and cetylpyridinium (CP) chloride and cetyltrimethylammonium (CTMA) bromide dissolved in chloroform was investigated. The optimum conditions for quantitative extraction (over 99%) by all extractants were determined.The extraction described can be used as a very simple method for ruthenium separation and also for the spectrophotometric determination of ruthenium (III) in the organic phase, which is more sensitive than in the aqueous phase. The extraction behaviour of CTMA and CP was found to be more efficacious than that of TPA and TPP, because lower excess of extractant and less shaking time of the aqueous and organic phases were required. Distribution and spectrophotometric methods showed that the mechanism of extraction was based on the formation of ion-associated compounds between two onium cations and one ruthenium (III) thiocyanate anion bearing two negative charges.

ruthenium; thiocyanate; spectrophotometry; tetraphenylarsonium; tetraphenylphosphonium; cetylpyridinium; cetyltrimetylammonium ions

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