an·i·on ex·change

(an'ī-on eks-chānj'),

The process by which an anion in a mobile (liquid) phase exchanges with another anion previously bound to a solid, nonmobile, positively charged phase, the latter being an anion exchanger. For example, the process 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); in combination with the cation exchange, NaCl is removed from solution. Anion exchange may also be used chromatographically, to separate anions, and, medicinally, to remove an anion (for example, Cl^-) from gastric contents or bile acids in the intestine.

Farlex Partner Medical Dictionary © Farlex 2012

an·i·on ex·change

(an'ī-on eks-chānj')

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. Anion exchange 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 for the Health Professions and Nursing © Farlex 2012

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References in periodicals archive

Phosphorylation of anion-exchange resin was made by three-chloride phosphorus in the presence of waterless chloride aluminium (Turobjonov et al., 2005).

New heat-resistant anion-exchange resin, containing highly basic groups, was synthesized by polymer amination of trimethylamine.

"Potentiometrical researches of sorption abilities of furan anion-exchange resins," Collection "Research of properties and application of polymeric materials" [Isslyedovaniye svoystv i primenyeniye polimernikh materialov], in Russian, Moscow

Phosphorus-contained polycondensation type ion-exchange resins

Whatman DE-53, a weak anion-exchange resin, was chosen because it has excellent physical properties compatible with the microcentrifuge spin column method and a high exchange capacity ([greater than or equal to] 2 meq/g dry weight).

Enzymatic assay of D-mannose in serum

The principal water treatment technique used in the finishing industry is deionisation, a reversible ion-exchange process in which combinations of cation-exchange and anion-exchange resins are used to remove inorganic salts from the feedwater.

Recycling rinse waters and recovering metals

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