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Abstract
The efficiencies of Cu(II) extraction from 0.5 mol/dm3 (Na,H)SO4 solutions by di(2-ethylhexyl)phosphoric acid (D2EHPA) in kerosene were measured in the presence of complexing agents EDTA, nitrilotriacetic acid (NTA), and citric acid. All experiments were performed in solution at pH 1.8–4.1; Cu(II) concentration of 0.005, 0.01, and 0.02 mol/dm3; the concentration of complexing agent to Cu(II) as 0, 0.1, 0.2, 0.5; and a D2EHPA concentration of 0.01–0.5 mol/dm3. The extraction efficiency of Cu(II) decreased with the addition of EDTA and NTA, but not with citric acid. The presence of complexing agents resulted in a change of reaction stoichiometry of Cu(II) and D2EHPA, likely due to the mutual interaction of Cu(II)-D2EHPA complexes and the complexing agents. The coextraction of citric acid into the organic phase could explain the increase in extraction efficiency with increasing citric acid concentration.
ACKNOWLEDGMENT
Support for this work by the ROC National Science Council under Grant No. NSC89-2214-E-155-002 is gratefully acknowledged.