Resumo

TEWAR, Brij B. STUDIES ON COMPLEXATION IN SOLUTION WITH PAPER IONOPHORETIC TECHNIQUE [THE SYSTEM MERCURY(II) / NICKEL(II) / LEAD(II) - HYDROXYPROLINE]. Rev. Bol. Quim [online]. 2011, vol.28, n.1, pp.6-13. ISSN 0250-5460.

ABSTRACT   A new method, paper electrophoresis, involving the use of an ionophoretic technique is described for the study of equilibria in solution.  This method is based on migration of a metal ion spot (M), under an electric field at various pHs of background electrolyte.  A plot of pHs versus  mobility of metal ion spots provide information about the formation of metal complexes allowing calculation of the stability of these complexes.  The stability constant of ML and ML₂ complex species of Hg(II), Ni(II) and Pb(II) with hydroxyproline were determined at an ionic strength of 0.1 M (perchloric acid) and at a temperature of 35º C.  The stability constants of ML and ML2 complexes of metal(II) - hydroxyproline have been found to be (8.65 ± 0.02; 7.14 ± 0.05), (7.02 ± 0.04; 5.56 ± 0.07) and (4.71 ± 0.01; 3.11 ± 0.03) (log k values) for Hg²⁺, Ni²⁺ and Pb²⁺ complexes, respectively

Palavras-chave : Ionophoretic technique; mercury(II) complexes; nickel(II) complexes; (II) complexes; hydroxyproline; overall mobility; stability constant.

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