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Título:	Gibbs-Donnan and specific ion interaction theory descriptions of the effect of ionic strength on proton dissociation of alginic acid
Autor/a:	Rey Castro, Carlos; Herrero, Roberto; Sastre de Vicente, Manuel E.
Notas:	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. This work was funded by the projects BQU2002-02133 (from the Ministerio de Ciencia y Tecnología of Spain) and PGDIT02TAM10302PR (from the Xunta de Galicia). C.R.C. benefited from a FPU grant of the Ministerio de Educación, Cultura y Deporte of Spain.
Materia(s):	-Gibbs-Donnan model -Potentiometry -Specific ion interaction theory -Alginic acid
Derechos:	(c) Elsevier, 2004
Tipo de documento:	article acceptedVersion
Editor:	Elsevier
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