Acid-Base Behavior of Two Isomeric Organ Phosphorus Extractants in a Biphasic Liquid System: Cobalt Extraction Test
Synopsis
The effect of the diluents on the acido- basic behavior of two isomeric organophosphorus acids Cyanex 272 (bis (2, 4, 4-trimethylpentyl) phosphinic acid) and DIOPA (diisooctyl phosphinic acid) in a system with two phases was studied separately by potentiometry in different media (sulfate, nitrate, perchlorate). The values of pKA of these two ligands were calculated and follow the decreasing sequence, regardless of the medium, for : Cyanex 272: Chloroform >dichloromethane >toluene >cyclohexane >1, octanol DIOPA: chloroform > dichloromethane > toluene > cyclohexane >1, octanol. Encouraging results have been obtained for the extraction of cobalt in biphasic medium chloroform-water, by these two ligands.
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