EXTRACTIVE RADIOMETRIC TITRATION AS A METHOD OF CHECKING EXTRACTION OF GOLD WITH DIETHYLDITHIOCARBAMATES

The extraction of gold(III) by copper-, zinc-, and mercury diethyldithiocarbamates from acid medium was studied by means of extractive radiometric titration, using trichloromethane or benzene as the solvent. Two end-points corresponding to the molar ratios 1 Au:1 DDC and 1 Au:2 DDC were observed on the titration curve of trivalent gold when diethyldithiocarbamate ion (DDC) was used as the titrant. Two compounds are formed successively: {Mathematical expression}. The first compound is completely extracted into trichloromethane or benzene; the extractibility of the second compound increases with increasing solvent polarity. Univalent gold forms only one compound with the diethyldithiocarbamate ion: AuDDC. © 1969 Akadémiai Kiadó.