Article

Heterogeneity of Cd(II)-Macromolecule Systems: A Potentiometric Study

  1. Roger Serra1,
  2. Francesc Mas2,
  3. José Manuel Díaz-Cruz1,
  4. Cristina Ariño1,
  5. Miquel Esteban1

Article first published online: 21 JAN 2000

DOI: 10.1002/(SICI)1521-4109(20000101)12:1<60::AID-ELAN60>3.0.CO;2-O

Issue

Electroanalysis

Electroanalysis

Volume 12, Issue 1, pages 60–65, 1 January 2000

Additional Information

How to Cite

Serra, R., Mas, F., Díaz-Cruz, J. M., Ariño, C. and Esteban, M. (2000), Heterogeneity of Cd(II)-Macromolecule Systems: A Potentiometric Study. Electroanalysis, 12: 60–65. doi: 10.1002/(SICI)1521-4109(20000101)12:1<60::AID-ELAN60>3.0.CO;2-O

Author Information

  1. 1

    Departament de Química Analítica, Universitat de Barcelona, Av. Diagonal 647, E-08028-Barcelona, Spain

  2. 2

    Departament de Química Física, Universitat de Barcelona, Av. Diagonal 647, E-08028-Barcelona, Spain

Publication History

  1. Issue published online: 21 JAN 2000
  2. Article first published online: 21 JAN 2000
  3. Manuscript Accepted: 11 MAY 1999
  4. Manuscript Received: 31 JUL 1998

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Keywords:

  • Potentiometry;
  • Polycarboxylic acids;
  • Humic acid;
  • Cadmium

Abstract

The complexation of Cd(II) with polymethacrylic acid (PMA) and humic acid (HA) has been studied potentiometrically with a Cd-ISE at constant pH and ionic strength. Experimental data have been analyzed qualitatively by means of Scatchard plots to see the heterogeneity of the system and to predict the number of different functional groups. A quantitative description of the complexation behavior has been given by fitting the binding curves to a Freundlich isotherm which provides a global characterization of the complexation process. The results obtained suggest an homogeneous behavior for the Cd(II)-PMA system and an heterogeneous one for the Cd(II)-HA system. Conditional intrinsic stability constants have been obtained for both systems.

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