anion-exchange resin


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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.

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.
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
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).
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.