SODIUM-SALTS OF D2EHPA, PC-88A AND CYANEX-272 AND THEIR MIXTURES AS EXTRACTANTS FOR NICKEL(II)

Extraction of nickel(II) from sulphate solution was carried out using sodium salts of D2EHPA, PC-88A and Cyanex-272(H(2)A(2))) in benzene, t he corresponding pH(0.5) values being 6.1, 6.8 and 7.2, respectively T he extracted species were determined to be NiA(2) . 2H(2)A(2). The ele ctronic spectra of the 3 nickel-bearing extractants showed that identi cal species are extracted into the organic phase. The loading capacity of 0.1 M extractant was found out. Detailed investigation pertaining to the influence of various sodium salts on the extraction system was carried out, Synergism was observed with the binary mixtures of the 3 extractants. The extrctants could be arranged in order of increasing s ynergism as D2EHPA<PC-88A<Cyanex-272.