title: On the protonation equilibria of sephadex C-25 and C-50.
abstract: The system H(+)Na(+) has been studied on Sephadex C-25 and C-50 at two ionic strengths by potentiometry. The data have been fitted by the Högfeldt three-parameter model. For ionic strength 0.100 M (Na)ClO(4) an excellent fit is obtained with a standard deviation of +/-0.013 for both gels. For ionic strength 0.010 M (Na)ClO(4) a satisfactory fit could only be obtained by excluding the lowest and highest pH-value for each gel.
authors.affiliation: Department of Inorganic Chemistry, The Royal Institute of Technology, S-100 44, Stockholm, Sweden.
authors.forename: E
authors.initials: E
authors.lastname: Högfeldt
authors.forename: T
authors.initials: T
authors.lastname: Miyajima
authors.forename: M
authors.initials: M
authors.lastname: Muhammed