离子交换法是液相中的离子和固相中离子间所进行的的一种

Ion exchange is a kind of ion between the liquid phase and the ion in the solid phase.

可逆性化学反应，当液相中的某些离子较为离子交换固体所喜好时，便会被离子交换固体吸附，为维持水溶液的电中性，所以离子交换固体必须释出等价离子回溶液中。

Reversible chemical reaction, when some ions in the liquid phase are more than the ionic exchange solid, they will be adsorbed by ion exchange solid, so as to maintain the electrical neutrality of the aqueous solution, the ion exchange solids must release the equivalent ions back to the solution.