ion exchange

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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.

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 ?
44), (45) The capacity of the zeolite for ionic exchange was measured using an ammonium salt soltuion.
Four tenders for the transport of (a) containers from Alexandria Port or Dekheila Port to the company's premises, (b) supply of caustic soda in liquid form of 46 % concentration, (c) manufacturing & supply of a coil (serpentine) for boilers 7 & 8, also (d) supply of ionic exchange resin.
Two tenders for the supply of (a) liquid chemicals for subordinated stations (including caustic soda in liquid form - 98 % and sodium hypochlorite 12 %), also (b) ionic exchange resins for the same.
Utilizing the same concepts in the development of PetroLuxus[TM] that separate water, heavy metals and other solids from oil by initiation of an ionic exchange mechanism on a nano scale to penetrate even the smallest particle, this new water base product is designed to remove entrained oil, suspended metals and other adulterates from water.