anion exchange

anion exchange
The process by which an anion in a mobile (liquid) phase exchanges with another anion previously bound to a solid, positively charged phase, the latter being an anion exchanger. It takes place when Cl is exchanged for OH in desalting. The reaction is Cl (in solution) + (OH on anion exchanger +) → (Cl on anion exchanger) + OH (in solution); combined with cation exchange, NaCl is removed from solution. A. may also be used chromatographically, to separate anions, and medicinally, to remove an anion ( e.g., Cl) from gastric contents or bile acids in the intestine.

Medical dictionary. 2011.

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