Abstract
Solvent extractions of copper(II) from aqueous thiocyanate solutions into carbon tetrachloride containing benzoyltrifluoroacetone and into 4-methyl-2-pentanone were studied. From the data of the former extraction system, the stability constants of metal thiocyanate complexes in the aqueous phase were determined. From the data of the latter system, the extraction constants for the CuSCN+ClO4-, Cu(SCN)2 and Na+Cu(SCN)3- species were obtained. The extraction curve of this metal ion as well as those of nickel(II), cobalt(II), zinc(II), cadmium(II), mercury(II) and lead(II) in this liquid-liquid system were considered from the standpoint of the stability and extractability of the complexes.
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