Studies of the liquid-liquid partition systems—IX: Effect of sodium perchlorate on the solvent extraction of indium(III) thiocyanate complex with tributylphosphate

Abstract

Solvent extraction of the indium(III) thiocyanate complex with tributylphosphate (TBP) in hexane has been studied when the total ionic concentration was 0·1,1,2,3, and 4 M at 25°C, and the extractionv curves analyzed to yield information on the formation of thiocyanate complexes in the aqueous phase and the extraction of the In(SCN) 3 species with the TBP. It was found that background sodium perchlorate greatly enhanced the extraction and, from the stability and two-phase distribution constants this was concluded to be mainly due to a salting-out effect of the In(SCN) 3 species by the sodium perchlorate; the K dm (= [In(SCN) 3] org,total [In(SCN) 3] aq values obtained were 10 1·00, 10 1·34, 1o 1·80, and 10 2·30, respectively, when the concentration of the ionic medium was 1,2,3 and 4 M.