1991 Volume 7 Issue 6 Pages 907-911
Novel compounds having two hydroxyoxime moieties were prepared and used for copper extraction from an acidic sulfate solution. Logarithmic plots of the copper distribution ratio vs. pH and the extractant concentration showed that the copper extractions were established through the formation of 1:2 (Cu2+: extractant) complexes. At concentrations below 1mM, however, the existence of the m:m (m>1) complexes were suggested by UV (molar ratio method) and ESR measurements. The half-extraction pHs of the extractants were in the range of 1.8 to 2.0 and were lower than that of LIX65N.