Liquid–liquid extraction of thiocyanate and thiocyanatoferrate(III) complexes with tris(3,5,5-trimethylhexyl)amine

Abstract

The distribution ratio of iron(III) at initial concentration 10^–4M has been measured using aqueous solutions of potassium nitrate and thiocyanate, at pH 2, with ionic strengths 0·25 and 0·50M, and an organic phase of tris(3,5,5-trimethylhexyl)amine in benzene. Concentrations of thiocyanate and of the amine were varied. An extraction equation was derived and found to be in good agreement with the results up to a thiocyanate concentration of 0·025M. Values of extraction equilibrium constants were calculated in several ways.