VOLTAMMETRIC STRIPPING ANALYSIS OF METAL CONCENTRATES WITH POLYMERS SOLUBLE IN AQUEOUS-SOLUTIONS

The conditions were worked out for the simultaneous stripping voltamme tric determination of components of the ternary Pb(II)-Cu(II)-Cd(II) a nd binary Ag(I)-Cu(II) systems at a carbon-paste electrode in 2% aqueo us solutions of the water soluble polymer polyethyleneimine (PEI) and its thiourea-containing derivative (TU-PEI). Water-soluble polymers ar e shown to reduce the mutual effects of the components of the binary a nd ternary system at the electrode surface. The different complex stab ility of Ag(I), Pb(II) or Cd(II) and Cu(II) with PEI and TU-PEI allows Ag(I), Pb(II) and Cd(II) to be determined in the presence of a large excess of Cu(II).