Liquid-Liquid Extraction and Separation of Cobalt(II) from Sodium Acetate media using Cyanex 272

摘要

A simple liquid-liquid extraction method has been developed for the quantitative extraction of cobalt(II) from an aqueous solution of 0.5 M sodium acetate using cyanex 272 [bis (2,4,4-trimethyl phenyl) phosphinic acid] in toluene as extractant. Cobalt(II) was quantitatively back extracted from the organic phase using 3.0 M nitric acid. The effects of various parameters affecting the extraction equilibrium of cobalt(II) such as sodium acetate concentration, cyanex 272 concentration, equilibration time, effect of various diluents, diverse ions and stripping agents have been studied. The separation of cobalt(II) from various binary as well as multicomponent mixtures has been achieved depending on the difference in the extraction and stripping behavior towards these metals. The method was extended for the separation and determination of cobalt(II) from real samples. The reliability of method is assured by comparison of the results with those obtained using AAS.