Cyanex272

The salt of CoCl₂.6H₂O (Merck company, 98.0%) was acquired for the preparation of cobalt solution. Bis (2,4,4-trimethylpentyl monothiophosphinic acid) (Cyanex302) (Aldrich company, 90.0%), bis(2,4,4-trimethylpentyl)dithiophosphinic acid (Cyanex301) (Aldrich company, 90.0%), bis-(2,4,4-trimethylpentyl) phosphinic acid (Cyanex272) (Aldrich company, 90.0%), and Di-(2-ethylhexyl)phosphoric acid (D2EHPA) (Merck company, 95.0%), as the extractants and kerosene (99.9%) as the diluted phase from Merck company, were used in the experiments. Ethylene glycol from Sigma Aldrich, 99.5% was used as the non-aqueous system. Another diluted phase such as, chloroform (99.8%), 1-decanol (99.0%), and toluene (99.9%) was provided from Merck. HCl (37.0%, Merck) and NaOH (99.9%, Merck) solutions were used to reach the appropriate pH of solutions in the experiments. As reverse extraction agents, acids like sulfuric acid (96.0%, Merck), nitric acid (65.0%, Merck), and hydrochloric acid were utilized. Ascorbic acid (99.0%, Merck), ammonium thiocyanate (99.0%, Merck), acetone (99.0%, Merck), and hydrochloric acid were used as cobalt detectors using a UV spectrophotometer.