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The osmotic coefficients of the sodium form of some biopolymers

✍ Scribed by Larry K. Jang; Ernesto J. Quintero; Grisel Gordon; Markus Röhricht; Gill G. Geesey

Publisher
Wiley (John Wiley & Sons)
Year
1989
Tongue
English
Weight
264 KB
Volume
28
Category
Article
ISSN
0006-3525

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✦ Synopsis

The osmotic coefficients +p,Na of dilute solutions of the sodium form of some weakly acidic polymers are theoretically predicted in this work. Based on the measured value 0.73 of yNa, the activity coefficient of free Na+, of the completely ionized humic acid (sodium salt) in a salt-free solution, the effective interligand distance b is calculated to be 11.34 A by using Manning's counterion condensation theory [Manning, G. S. (1969) J . Chem. Phys. 51(3), 9241. The corresponding values of yNa (measured experimen!ally) and b for the completely ionized exopolymer of Pseudomom qtlanticu are 0.624 and 7.57 A when cultivated at a dilution rate D = 0.015 h-', 0.647 and 8.19 A at D = 0.025 h-', and 0.613 and 7.29 Aat D = 0.06 h-*. For alginic acid (in the completely ionized sodium form), yNB = 0.40 and b = 4.71 A. The osmotic coefficients +p,Na for the partially and the completely ionized polymers are then predicted with Manning's theory as well.

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