G-Ion Weak Acidic Cationic Resins, which contain weakly acidic groups, such as carboxyl COOH, can dissociate H + surface star acidity in water. The remaining negative groups after resin dissociation, such as r-coo – (R is a hydrocarbon group), can adsorb and combine with other cations in the solution, resulting in cation exchange. G-Ion Weak Acid Cation Resin of resin is acidic, i.e. has high dissociation. It seems some hard to dissociate and exchange the ions at lower pH level. it can only function in alkaline, neutral or slightly acidic solutions (such as pH5 ~ 14). G-Ion Weak Acidic Cationic Resins is also regenerated with acid that depend of applications. 

Among them, the G-Ion Weak Acid Resin with carboxylic acid group is the most widely used. Carboxylic acid cation resin, like organic acid, has weak dissociation degree in water and is weakly acidic. R-coohr-coo – + H +, it can only dissociate in near neutral and alkaline media and shows ion exchange function. The exchange rate of this kind of G-Ion resin is slow, and its exchange capacity (working capacity) depends on the pH value of the treated solution.

It is mainly used in water treatment, rare element separation, dealkylation and softening water, antibiotic and amino acid extraction and separation in pharmaceutical industry.