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.

anion-exchange resin

any one of the simple organic polymers with high molecular weights that exchange the resin anions with other anions in solution. Compare cation-exchange resin.

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.

anion

an ion carrying a negative charge. In an electrolytic cell anions are attracted to the positive electrode (anode).

anion-exchange resin

resin

1. a solid or semisolid, amorphous organic substance of vegetable origin or produced synthetically. True resins are insoluble in water, but are readily dissolved in alcohol, ether and volatile oils.
2. rosin.

acrylic r's
products of the polymerization of acrylic or methacrylic acid or their derivatives and used in the fabrication of surgical prostheses and equipment.
anion-exchange resin
cation-exchange resin
cholestyramine resin
a synthetic, strongly basic anion-exchange resin in the chloride form which chelates bile salts in the intestine, thus preventing their reabsorption.
composite resin
usually a mixture of organic matrix and inorganic filler, used in restorative dentistry.
ipomoea resin, jalap resin, scammony resin
severe cathartics and irritants; little used because of their disastrous effects.
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.
Ion exchange is attractive because the perchlorate group has a very high affinity for common polystyrene strong-base anion-exchange resins.
Other qualitative and quantitative methods have been reported (11-14), many of which include prepurification of PBG with anion-exchange resins, but all rely on the derivatization of PBG with Ehrlich-type reagent, which is not specific for PBG, and thus have the potential for false positives.
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.