The extration of Sn(II), Pb(II), Zn(II) and Cd(II) from aqueous solution containing HCl or HNO3 by the title extractant (I, HA) in kerosine was investigated at 20 ?1? Under these conditions, I is an efficient extractant for the extration of Sn(II). The extractability by I in kerosine decreases in the order Sn(II) ?Zn(II) > Pb(II) > Cd(II). With HA denoting the monomeric mol. of the extractant, the compns. of the extracted species in kerosine are SnA2?HA, PbA2?HA, PbA2?HA, ZnA2譎A, ZnA2?HA and CdA2?HA resp. The extration distribution ratio of Zn, Cd and Pb with a mixture of I and TOPO in kerosine decreased slightly, showed the absence of the synergistic effect of TOPO.

Key words: ZINC, EXTRACTIVE AGENT, CADMIUM, SOLVENT EXTRACTION, LEAD, TIN, EXTRACTION EQUILIBRIUM, LEAST SQUARE METHODS, MONO (ETHYLHEXYL) PHOSPHORIC ACID