Extraction of cobalt (II) from an acidic sulphate solution has been studied using sodium salts
of D2EHPA, PC-88A and Cyanex-272 in benzene; the corresponding pH 0.5 values are 6.0,
6.25 and 6.6, respectively. The extracted species appear to be CoA 2 (HA) 2. The electronic
spectra of the extracted organic phase support the nature of the species extracted. The
loading capacity of 0.1 M extractants in benzene has been determined. The influence of
NaCl, NaNO 3, Na 2 SO 4 and NaSCN on the extraction systems has been investigated …

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, the corresponding pH (0.5) values being
6.1, 6.8 and 7.2, respectively The extracted species were determined to be NiA (2). 2H (2) A
(2). The electronic spectra of the 3 nickel-bearing extractants showed that identical 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 …