(1) Strong basic anion resin

This kind of resin contains strong alkaline groups, such as quaternary amine (also known as quaternary amine group) - NR₃OH (R is hydrocarbon group), which can dissociate OH in water and become strong alkaline. The positive group of the resin can adsorb and bind with the anions in the solution, resulting in anion exchange.

This resin has strong dissociation and can work normally at different pH. It is regenerated with strong alkali (such as NaOH).

(2) Weakly basic anion resin

This kind of resin contains weak basic groups, such as primary amine (also called primary amine) - NH₂, secondary amine (secondary amine) - NHR, or tertiary amine (tertiary amine) - NR₂, which can dissociate OH - in water and become weak alkaline. The positive group of the resin can adsorb and bind with the anions in the solution, resulting in anion exchange. In most cases, this resin will absorb the whole other acid molecules in the solution. It can only work under neutral or acidic conditions (such as pH1-9). It can be regenerated with Na₂Co₃ and NH₄OH.