1028. Counter-ion fixation in alginates

Biosorption of copper by Sargassum fluitans biomass in fixed-bed column

“…Based on the sequence of the concentration peaks from Figure 1, a qualitative comparison of the affinities of different metals towards the biomass can be made. Taking the times of maximum concentrations of metals in the effluent as dynamic measures of attraction, metals can be arranged in the ascending order of affinity as follows, Na' S K' < Mg" < Ca" This sequence obtained from the column agrees well with the set of gradually decreasing values of the respective osmotic coefficients: I$ Na = 0.33, $I K = 0.31, I$ Mg = 0.16, and I&" = 0.03 for metal cations in alginates obtained from osmotic equilibrium experiments (Katchalsky 1953). To complete the picture of the biosorption of CL?'…”

Controlled Delivery of Drugs from Alginate Matrix

“…This is a result of ionic interaction and intramolecular bonding between the carboxylic acid groups located on the polymer backbone and the cations that are present. [25,26] Regions of guluronate monomers in one alginate molecule can be linked to a similar region in another molecule by means of calcium or other divalent cations.…”

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

“…(11) was solved iteratively, assuming pK Ã ða;I¼2 MÞ ¼ pK Ã ðaÞ . The values of / p were taken from the literature [29], taking into account that the difference between the osmotic coefficients of sodium and potassium alginate can be considered negligible [44]. The results of the calculations for AA in KNO 3 are shown in Fig.…”