Abstract
The net electric chargez pof a polyacrylamide molecule (Praestol, Mol. Wt. 3.4×106) in aqueous solution was determined for two pH values (7.2 and 10.0) by measuring the Donnan e.m.f. as function of the solutions NaCl contentc (2.7 mM<c<74 mM). Taking into account a non-ideal behavior of the counterions (Na+) mobility, the numerical values ofz pturned out to be 3100 and 5500 electric charge units for pH=7.2 and 10.0, respectively. A measurable contribution of the assumed non-ideal model for the Na+ ions is found forc<15 mM.
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Tippe, A. Determination of the net electric charge of a polyacrylamide molecule by Donnan potential measurements. Colloid Polym Sci 271, 1152–1156 (1993). https://doi.org/10.1007/BF00657070
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DOI: https://doi.org/10.1007/BF00657070