Search results for "Proton- and metal-binding capacity"

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Modelling of proton and metal exchange in the alginate biopolymer.

2005

Acid-base behaviour of a commercial sodium alginate extracted from brown seaweed (Macrocystis pyrifera) has been investigated at different ionic strengths (0.1or=I/mol l(-1)or=1.0) and in different supporting electrolytes (Et4NI, NaCl, KCl, LiCl, NaCl+MgCl2), with the aim of examining the influence of ionic medium on the proton-binding capacity and of quantifying the strength of interaction with light metal ions in the perspective of speciation studies in natural aqueous systems. Potentiometric ([H+]-glass electrode) and titration calorimetric data were expressed as a function of the dissociation degree (alpha) using different models (Henderson-Hasselbalch modified, Högfeldt three parameter…

Alginic acid; Proton- and metal-binding capacity; Thermodynamic parameters; Ionic strength dependence; Models for medium dependence and ion associationProton bindingAlginatesIonic strength dependenceInorganic chemistryPotentiometric titrationIonic bondingProtonationElectrolytePhaeophytaBiochemistryAnalytical ChemistryBiopolymersGlucuronic Acidalginic acid proton and metal-binding capacity Thermodynamics parameters Ionic strength dependence models for medium dependence and ion associationAlginic acidMagnesium ionAqueous solutionMolecular StructureChemistryHexuronic AcidsProton- and metal-binding capacityThermodynamic parametersIonic strengthMetalsProtonsModels for medium dependence and ion associationAnalytical and bioanalytical chemistry
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