The model applies to neutral organic chemicals and ionogenic
organic chemicals that are predominantly neutral at the test system pH (pH = 7.4), which was the case for 23 of the chemicals evaluated (Table 1).
In order to remove ionogenic
impurities from enzyme solutions and to displace proteins, the filtrate of culture liquid was processed by strong-base ion-exchange resins: Amberlite CG-400 (US) and A500P (Great Britain), which can be used together with conventional coal adsorbents.
This is possible in the beads because of a relative abundance of ionogenic
sites in the polymer matrix.
Dissociation constants for ionogenic
compounds were collected from several sources and presented along with the calculated degree of ionization (a) at pH = 6 in Table 1.
Seeming constants of ionogenic groups dissociation, found from the titration curves, correspond to p[kappa]-3.4, p[kappa]-7.5 (Table 4).
Presence of ionogenic groups in structure of received cation-exchange resin was also investigated by IR-spectroscopical method.
For phosphate cation-exchange resins various types of linkage of metal with ionogenic groups of ion-exchange resin are characteristic: ionic, mixed ionic-coordination and purely coordination.
She explains that the technique, a mode of high-performance liquid chromatography, was developed to overcome the drawbacks of ionic suppression and ion exchange chromatography, and allows the separation of complex mixtures of polar, ionic, and ionogenic
Similarly, the relative quantities of the ionic form of an ionogenic
pesticide are also dependent on the pH of the system.
Three types of hydrophilic groups: cations, anions, and zwitterions, known as "ionogenic groups," are generally employed and form, according to the ionic charges on the polymeric main chain: cationomers (6,7), anionomers (8-11), and zwitterionomers (12), respectively.
Polyurethane ionomers (PUIs) are PU polymer chains containing ionogenic groups.
Because of a lack of data and models for parameterizing and simulating far-field human exposures to diverse types of ionogenic
chemicals, we did not include dissociation in this case study.