Authors : Natalia Meychik, Galina Veretennikova, Olga Stepanova, Yuliya Nikolaeva, Olga Svetnyova and Sergey Stepanov
Abstract: Conducted potentiometric titration of the weakly basic anion exchange resin (degree of crosslinking 12-16%) in a wide range of changes in solution pH (2-12) and concentration of NaCl (0.1; 1 M). The maximum ion exchange capacity of the ion exchanger for HCl (6.50±0.12 mmol/g of dry weight) which does not depend on the ionic strength of the solution. It is shown that in the investigated range of concentrations of background electrolyte and pH the process of acid-base balance can be adequately described by the Gregor equation. The calculated values of the parameters of this equation, according to which analyzed the behavior of the anion exchanger depending on pH and concentration of NaCl. In the anion, there are two types of groups which ionization constants differ by three periods. The existence of the different nature of the amino groups is confirmed by the data of functional analysis and found that the acidity of the amino groups is attenuated with increasing concentration of NaCl.
Natalia Meychik, Galina Veretennikova, Olga Stepanova, Yuliya Nikolaeva, Olga Svetnyova and Sergey Stepanov, 2017. Acid-Base Properties of Macroporous Weak Base Anion Exchange Resin. Journal of Engineering and Applied Sciences, 12: 6710-6715.