Influence of counterion concentration on equilibria and conformational properties of linear weak-acid polyelectrolytes

Marinsky, Jacob A.; Miyajima, Tohru; Högfeldt, Erik; Muhammed, Mamoun

doi:10.1016/0923-1137(89)90114-0

Cited by 33 publications

(35 citation statements)

References 18 publications

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“…This observation has been confirmed by ref 16 and therefore there is no need for their assessment. Other authors [16][17][18][19][20][21] attempted to calculate activity coefficients by applying the specific interaction theory. 22 There are difficulties encountered when determining the interaction coefficients of the charged groups fixed on the resin matrix.…”

Section: Activity Coefficientssupporting

confidence: 70%

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Estimation of Deprotonation Coefficients for Chelating Ion Exchange Resins. Comparison of Different Thermodynamic Model

2001

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The deprotonation of quinolic resin P-127 and iminodiacetic resin Amberlite IRC-718 has been studied. The process of salt transfer into the resin phase is considered to be an important contributor to the deprotonation process. Estimation of the salt transfer was based on the principle of equal activity of the salt in both phases at equilibrium. Two assumptions were made: sorbed alkali metal ions are not associated with functional groups, while all hydrogen ions are associated with functional groups. The associated hydrogen ions and functional groups do not contribute to the internal ionic strength value. Two thermodynamic models, describing the deprotonation of ion-exchange resin, were used and compared: the Gibbs-Donnan-based model of Bukata and Marinsky and the model proposed by Erik Högfeldt. Thermodynamic characteristics of the resins' deprotonation are obtained using two different thermodynamic approaches. Högfeldt's three-parameter model provides a better agreement with experimental data. The fitting of the data to Marinsky's method can be improved by taking into account the influence of the resins' macroporosity; however, this requires an additional empirical parameter to describe the resin.

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Section: Activity Coefficientssupporting

confidence: 70%

“…16,[18][19][20][21] The main difficulty for thermodynamic modeling of such systems is related to the strong sensitivity of the equilibrium to the salt concentration in the aqueous solution. Two of the most successful models are considered below.…”

Section: Thermodynamic Models Of the Ion Exchange Equilibriamentioning

confidence: 99%

Estimation of Deprotonation Coefficients for Chelating Ion Exchange Resins. Comparison of Different Thermodynamic Model

2001

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“…Since [A] p can di-in the application of the present model to the equilibrium rectly be related to the effective polyelectrolyte phase vol-analysis of naturally occurring polyelectrolytes with heteroume, change in k intra with a which reflects successive com-geneous functionality such as humic substances. plexation behavior of these multiligated systems is expected to give information on the effective volume change upon CONCLUSIONS acid-dissociation (34,35), i.e., the effective polyelectrolyte phase volume of PAA remains rather constant when a ú Based on a Donnan-based concept, a unified analytical treatment has been presented for the complexation equilibria 0.3, whereas it increases abruptly with an a decrease in the region of 0 õ a õ 0. 3 (33, 34).…”

Section: Methodsmentioning

confidence: 99%

Analysis of Complexation Equilibria of Polyacrylic Acid by a Donnan-Based Concept

Miyajima

Mori

Ishiguro

1997

Journal of Colloid and Interface Science

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“…A twophase model based on the Gibbs-Donnan formalism has been proposed to explain the properties of these substances by Marinsky and co-workers [26][27][28].…”

Section: Gibbs-donnan Model For a Weak Acid Polyelectrolytementioning

confidence: 99%

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

Rey-Castro¹,

Herrero²,

Vicente³

2004

Journal of Electroanalytical Chemistry

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The apparent proton dissociation constants of a commercial alginic acid have been obtained in KNO 3 and NaCl at concentrations ranging between 0.01 and 2 mol L À1 . An analysis of the dependence on the ionic strength at a constant value of the degree of dissociation 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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Influence of counterion concentration on equilibria and conformational properties of linear weak-acid polyelectrolytes

Cited by 33 publications

References 18 publications

Estimation of Deprotonation Coefficients for Chelating Ion Exchange Resins. Comparison of Different Thermodynamic Model

Estimation of Deprotonation Coefficients for Chelating Ion Exchange Resins. Comparison of Different Thermodynamic Model

Analysis of Complexation Equilibria of Polyacrylic Acid by a Donnan-Based Concept

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

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