On the Complexation of Cd(II) Ions with Polyacrylic Acid

Journal of Colloid and Interface Science
T MiyajimaC H Moon

Abstract

Complexation of Cd(II) ions with polyacrylic acid has been studied potentiometrically and by 113Cd NMR spectroscopy. A Donnan model proposed by Marinsky (Marinsky, J. A., in "Ion Exchange and Solvent Extraction" (J. A. Marinsky and Y. Marcus, Eds.), Vol. 11, p. 237. Dekker, New York, 1993; Miyajima, T., in "Ion Exchange and Solvent Extraction" (J. A. Marinsky and Y. Marcus, Eds.), Vol. 12, p. 275. Dekker, New York, 1995) has been applied in order to correct for the electrostatic effect on the equilibria inherent in the polyelectrolyte nature of the polyions. The potentiometric studies showed that the bidentate ligand complex, (CdA2)0, is the dominant species, but the formation of monodentate ligand complex, (CdA)+, cannot be neglected at low degree of dissociation of the polyacid. The stability constants of the (CdA)+ and (CdA2)0 complexes have been determined to be approximately 3.2 x 10 and 1.6 x 10(2), respectively. These values are in good agreement with the stability constants of 4.1 x 10 and 1.0 x 10(2) for Cd(acetate) and Cd(glutarate) complexes, where acetate and glutarate ions are the monomer analog ligands of polyacrylic acid. The 113Cd NMR chemical shift change upon dissociation of the polyacid also indicates that th...Continue Reading

Citations

Mar 1, 1997·Journal of Colloid and Interface Science·T MiyajimaS i Ishiguro
Jul 6, 2014·The Journal of Physical Chemistry. B·Judit Horváth
Jun 23, 2018·Physical Chemistry Chemical Physics : PCCP·Pierre-Arnaud ArtolaGabriel Plancque
Jul 21, 2006·The Journal of Physical Chemistry. B·C C PantazisP J Pomonis
May 12, 2001·Environmental Science & Technology·R M FloroiuA Torrents

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