Zum einfluss des leitelektrolyten auf die polarographi- sche reduktion des methylbromids

The irreversible polarographic reduction of methyl bromide was studied in aqueous solution in the presence of various base electrolytes.E_{$\text{1}\text{2}$} values became more positive with increasing charge density and surface activity of the cations. Mixed electrolytes with alkali metal salts and tetraalkylammonium salts or cationic surfactants suppressed this increase inE_{$\text{1}\text{2}$} values. With such mixed electrolytes containing highly active surfactants of sufficient charge density, a normal polarographic determination of methyl bromide is possible. The final diffusion rate of the active component has also a considerable effect on E_{$\text{1}\text{2}$} values so that the E_{$\text{1}\text{2}$} values of such systems cannot be characterized by the solution composition alone.