Separation of Ti(IV) and Fe(III) from Aqueous Sulphate Solution by Cyanex 272 [Bis(2,4,4-Trimethylpentyl) Phosphinic Acid] in Kerosene: Separation of Ti and Fe from Sulphate Using Cyanex. Pakistan Journal of Scientific & Industrial Research 2009, 52 (5), 231-238.