Gibbs-Donnan and Specific Ion Interaction Theory Descriptions of the Effect of Ionic Strength on Proton Dissociation of Alginic Acid
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Gibbs-Donnan and Specific Ion Interaction Theory Descriptions of the Effect of Ionic Strength on Proton Dissociation of Alginic AcidFecha
2004Cita bibliográfica
Journal of electroanalytical chemistry, 2004, vol. 564, p. 223-230
Resumen
[Abstract] The apparent proton dissociation constants of a commercial alginic acid have been obtained in KNO3 and NaCl at concentrations ranging between 0.01 and 2 mol·L-1. An analysis of the dependence on the ionic strength at a constant value of the dissociation degree was done by means of empirical functions derived from the Gibbs-Donnan formalism for polyelectrolytes and a specific ion interaction theory (SIT). Both functions were able to fit the experimental data, although SIT yielded rather high errors in the fitted parameters due to a problem of multicollinearity, in contrast to the function derived from the Gibbs-Donnan approach.
Palabras clave
Potentiometry
Gibbs-Donnan model
Specific ion interaction theory
Alginic acid
Equilibrium constants
Gibbs-Donnan model
Specific ion interaction theory
Alginic acid
Equilibrium constants
Versión del editor
ISSN
1572-6657