The solvent extraction of Cu(II), Ni(II), and Co(II) with diacetyl-mono-(2-quinolylhydrazone)

Summary

Diacetyl-mono-(2-quinolylhydrazone), DmQH, has been studied as a solvent extracting agent for Cu(II), Ni(II), and Co(II) into the solvent MIBK. Cu(II) extracts as the Cu(CO)⁺ ion in a 1∶1 complex with DmQH to form the neutral species [Cu(OH)(L)]. Since there is no variance of the distribution coefficient with the perchlorate ion present, no ion pairing exists. At pH values greater than 6, copper may be extracted with an efficiency of 95% into MIBK while there is no extraction of this complex into benzene. The extractions of Ni(II) and Co(II) show some dependence with pH; however, their efficiencies are less than 50%. At pH values greater than 6.5, gelatinous precipitates form which coagulate at the interface between the two solvents.

Zusammenfassung

DmQH wurde zur Extraktion von Cu(II), Ni(II) und Co(II) in das Lösungsmittel MIBK verwendet. Cu(II) bildet als Cu(OH)⁺-ion mit DmQH einen neutralen 1∶1-Komplex der Zusammensetzung Cu(OH)(L). Da sich