离子交换法是液相中的离子和固相中离子间所进行的一种可逆性化学反应，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。

Ion exchange method is a reversible chemical reaction between ions in liquid phase and ions in solid phase. biaozhizh.37ix.com.cnshusongdaix.37ix.com.cnshusongdain.37ix.com.cnshusongdaip.37ix.com.cnzhong

zhi.37ix.com.cndianliguan.37ix.com.cnWhen some ions in liquid phase are preferred by ion exchange solids, they will be adsorbed by ion exchange solids. In order to maintain the electroneutrality of aqueous solution, the ion exchange solids must release equivalent ions back to the solution.