Effect of Anions, Complexing and Salting - out Agents on the Extraction of Mo (VI) from Acid Media into Chloroform Solution of Bis (4-Acylpyrazolones)

Abstract

The extraction of Mo (VI) was carried out in the presence of a synergist in the organic phase and also in the presence of the corresponding acids (HCl and H2SO4). The effect of the anions, Cl-, SO42- , Br- , I- , SCN-, PO43-, EDTA, Oxalate, acetate and tartarate on the extraction of Mo (VI) into chloroform solutions of 4-adipoylbis (1-phenyl-3methylpyrazolone-5), H2Adp and 4-sebacoylbis (1- phenyl-3-methylpyrazolone-5), H2SP were studied.  The results showed that the masking effect of the halides on the extraction of Mo (VI) followed the increasingly order Cl-<Br-<I-. The trend follows the direction of decrease in electro negativity. Similarly, the extraction of Mo(IV) is increasingly masked with increase in concentration of the complexing agents, decreasing the % extraction from as high as 60% extraction at 10-3M ligand concentration to as low as10% at 1M ligand concentration.  The extraction of the metal is greatly enhanced in the presence of their corresponding acid solution by increasing the extraction by as high as 10- 40% and also in the presence of butanol. Under all conditions, H2SP showed to be a better extract ant than H2Adp:          H2SP >> H2Adp  Decrease in BuOH Synergism