NMR FOR THE DETERMINATION OF LIGAND-METAL RATIOS IN SOLVENT-EXTRACTION

In addition to the more conventional methods used in hydrometallurgy t o determine the stoichiometry of ligand-metal species formed in solven t extraction, a few research efforts have been done to establish some spectroscopic techniques which call provide that information ''in situ .'' In this work, nuclear magnetic resonance is used to confirm the Cy anex 471X-silver ratio when the metal is extracted from a concentrated chloride medium on the basis of the ''coordination shift'' detected i n some nucleus of the organic ligand upon complexation. The same appro ach has also been applied successfully to estimation of the compositio n of triphenylphosphine-silver chloride species synthesized in one pha se.