ion exchange

(redirected from Cation-exchange)
Also found in: Dictionary, Thesaurus, Encyclopedia.
Related to Cation-exchange: 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, 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.

ion-ex·change chro·ma·tog·ra·phy

(ī'on-eks-chānj' krō'mă-tog'ră-fē)
Chemical investigation in which cations or anions in the mobile phase are separated by electrostatic interactions with the stationary phase.
See also: anion exchange, cation exchange

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

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.

ion exchange

A reversible chemical reaction in which ions in a solution are replaced by others with like charge from an insoluble solid such as an ION EXCHANGE RESIN. The process is used for softening hard water, purifying sugar, separating radioactive isotopes and for other purposes.
References in periodicals archive ?
Presence of ionogenic groups in structure of received cation-exchange resin was also investigated by IR-spectroscopical method.
Evaluation of cation-exchange HPLC compared with isoelectric focusing for neonatal hemoglobinopathy screening.
Cation-exchange HPLC has become the method of choice for the initial screening of Hb variants (19) (including neonatal screening where this is mandated) and for quantification of Hb A2 and Hb F concentrations, and detection of several abnormal Hbs.
In cellulose acetate electrophoresis and anion-exchange HPLC, the calculated pI change predicted correctly a mobility difference in approximately 85% and 90% of all variants, respectively, and in cation-exchange HPLC and IEF, the calculated pI difference gave a correct prediction in 70% and 63% of the variants, respectively.
Sharma, "Acetalization of Ethylene Glycol with Formaldehyde using Cation-Exchange Resins as Catalysts: Batch Versus Reactive Distillation," React.
Cation-exchange properties of hydrothermally treated coal fly ash // Envir.
6] for several hours in an electric furnace at high temperature, exhibits a cation-exchange capacity of 100 meq/100g.
Group 1 was applied to a cation-exchange column, and the column was eluted with a 70-min linear gradient of 0-0.
Bear River zeolite is a natural occurring volcanic rock composed of the mineral clinoptilolite that is a cation-exchange agent.
The line comprises two high-capacity anion-exchange columns--the AS11-HC-4[micro]m column and the AS18-4[micro]m column--and one high-capacity cation-exchange column--the CS19-4[micro]m.
Barticevic E, Gonzalez S, Aomine S (1975) Cation-exchange capacity of the sand fraction of some Chilean soils.
HbA1, consisting of HbA1a, HbA1b, and HbA1c, received its name because of its fast-eluting nature as quantified with cation-exchange chromatographic methods.