Polarography of some sulphur-containing compounds: Part XIV.Anodic waves of ethylene-1,2-bisdithiocarbamate and reactions with heavy metals

The presence of two 2-electron anodic steps on polarographic curves of ethylene-1,2-bisdithiocarbamates together with the shifts of the half-wave potentials with pH and the adsorption phenomena, indicate a simultaneous reaction of both dithiocarbamate groupings at the electrode surface. In the homogeneous alkaline solutions, cadmium(II), copper(II) and lead(II) ions form an intermediate 1:1 compound with ethylene-1,2-bisdithiocarbamate in which only one dithiocarbamate group reacts. A 1 M sodium hydroxide solution is most suitable for the determination of the ethylene 1, 2-bisdithiocarbamate anion liberated from zinc or manganese derivatives in the analysis of pesticides ZINEB and MANEB. Waves of disodium ethylene-bisdithio-carbamates (NABAM) allow 1 · 10^-5M solutions to be analysed.