Investigation of bis(carboxymethyl)dithiocarbamate complexes by the extraction method

The extraction of copper, lead, cadmium, nickel and zinc dithizonates was investigated in the presence of ammonium bis(carboxy-methyl)dithiocarbamate. For all metals studied, except zinc, masking of extraction was observed, depending on the amount of the dithio-carbamate in the aqueous phase. From the shift of the pH(1 2 ) values for dithizonate extraction, the stability constants beta(2) for the metal complexes with bis(carboxymethyl)dithiocarbamate were calculated. The logarithms of the constants are 21.46, 15.45,11.24 and 7.93 for the copper, lead, cadmium and nickel complexes respectively.