On the protonation equilibria of sephadex C-25 and C-50.
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.
Högfeldt
E
E
Department of Inorganic Chemistry, The Royal Institute of Technology, S-100 44, Stockholm, Sweden.
Miyajima
T
T
Muhammed
M
M