cation-exchange resin

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Related to cation-exchange resin: anion exchange resin

cat·i·on ex·change

(kat'ī-on eks-chānj'),
The process by which a cation in a liquid phase exchanges with another cation present as the counter ion of a negatively charged solid polymer (cation exchanger). A cation-exchange reaction in removal of the Na+ of a sodium chloride solution is RSO3-H+ + Na+ → RSO3-Na+ + H+ (R is the polymer, RSO3- is the cation exchanger); if this is combined with the anion-exchange reaction, NaCl is removed from the solution (desalting). Cation exchange may also be used chromatographically, to separate cations, and medicinally, to remove a cation, for example, H+, from gastric contents, or Na+ and K+ in the intestine. See: anion exchange.

cation-exchange resin

any one of various insoluble organic polymers with high molecular weights that exchange their cations for other cations in solution. Cation-exchange resins are used especially to restrict intestinal sodium absorption in patients with edema. Compare anion-exchange resin.

cat·i·on ex·change

(kat'ī-on eks-chānj')
The process by which a cation in a liquid phase exchanges with another cation present as the counter-ion of a negatively charged solid polymer (cation exchanger). Cation exchange may be used chromatographically, to separate cations, and medicinally, to remove a cation.
See also: anion exchange


a positively charged ion.

cation-anion balance
the balance in serum or plasma between the anions and cations must equilibrate near to the level of 155 mEq/l. Estimation of any imbalance, usually by chloride and bicarbonate measurement, is basic to any determination of acid-base abnormality.
cation channels
channels through selectively permeable membranes via which only cations can migrate.
dietary cation-anion difference
prepartum has a major influence on the incidence of hypocalcemia (milk fever) in dairy cattle and, in the control of the disease, is manipulated so as to result in a metabolic acidosis which facilitates the mobilization of calcium. Defined as milliequivalents of (Na+K)-(Cl+S) per kg DM diet.
cation-exchange resin
ion-exchange 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 ?
Sharma, "Acetalization of Ethylene Glycol with Formaldehyde using Cation-Exchange Resins as Catalysts: Batch Versus Reactive Distillation," React.
We then added 200 [micro]L of cation-exchange resin (AG50W-X8,100-200 mesh) and shook the suspension for 30 min at room temperature.
Macroporous strong acidic cation-exchange resins, derived by sulfonation of acetone-washed or without acetone-washed St-DVB base copolymer synthesized by using n-heptane/toluene as diluents, show no difference with respect to ion-exchange capacity, leachable organics, and other characteristics.