EXTRACTION OF COMPLEXES OF SOME METALS WITH 1,1-DISUBSTITUTED 3-DIPHENOXYTHIOPHOSPHORYLTHIOUREAS

The extraction of complexes of silver, mercury, cadmium, cobalt, zinc, scandium and some rare earth elements (Ln) into benzene solutions of 1.1-disubstituted 3-diphenoxythiophosphorylthioureas (HA) containing alkyl and aryl substituents was examined using the radiotracer technique. The complexes AgA(HA), HgA2, CdA2 and LnA3 are extracted into the organic phase. and the extraction increases in order Co, Zn, Cd almost-equal-to Ln much less than Hg < Ag. The extraction constants were calculated. During the extraction process using medium acidic aqueous phases (1 M HNO3), the reagents decompose into the corresponding amines and (PhO)2P(S)NCS.