Determination of the complex formation constants for some water-soluble polymers with trivalent metal ions by differential pulse polarography

Caykara T., Inam R., Ozturk Z., Guven O.

COLLOID AND POLYMER SCIENCE, vol.282, no.11, pp.1282-1285, 2004 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 282 Issue: 11
  • Publication Date: 2004
  • Doi Number: 10.1007/s00396-004-1108-1
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.1282-1285


The formation of metal complexes between water-soluble polymers, poly(vinyl alcohol) [PVA], poly(N-vinylpyrrolidone) [PVP], poly(acrylamide) [PAAm] and poly(ethylene oxide) [PEO] with trivalent metal ions, Fe3+, Cr3+, and V3+ were studied by using differential pulse polarography (DPP). The general experimental observation is the shift of totally reversible reduction peaks (M3++Hg+e(-)reversible arrowM(2+)+Hg) towards more negative potentials when the complexing water-soluble polymers are added to the solution of trivalent metal ions. The negative shift in potential permitted the determination of complex formation constants (K-f) between trivalent metal ions and water soluble polymers. The complex formation constants for Fe3+, Cr3+, and V3+ ions with these polymers increased in the order of V3+>Cr3+>Fe3+.