Gibbs-Donnan and specific ion interaction theory descriptions of the effect of ionic strength on proton dissociation of alginic acid

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2004
Author
Rey Castro, Carlos
Herrero, Roberto
Sastre de Vicente, Manuel E.
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Rey Castro, Carlos; Herrero, Roberto; Sastre de Vicente, Manuel E.; . (2004) . Gibbs-Donnan and specific ion interaction theory descriptions of the effect of ionic strength on proton dissociation of alginic acid. Journal of Electroanalytical Chemistry, 2004, vol. 564, p. 223-230. https://doi.org/10.1016/j.jelechem.2003.10.023.
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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.
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http://hdl.handle.net/10459.1/57337
DOI
https://doi.org/10.1016/j.jelechem.2003.10.023
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Journal of Electroanalytical Chemistry, 2004, vol. 564, p. 223-230
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