Cadmium reacts with methyl-5-oxo-pirazol-(4-azo-1')-2'-benzelsulphonic
reagent in the presence of 2,2'-dipiridil or 1,10-phenanthroline to f
orme mixed-ligand complexes. The complexes are extracted in clorophorm
. Characteristics of the complexes and optimum rnge of concentration h
ave been determined.