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 ?
Physical and Chemical Characteristics of the solution feeding the Ion Exchange
List of key factors responsible for building the upcoming opportunistic roadmap for the ion exchange membrane market at global, regional, and country level
During leaching, the solid sample is chemically analyzed every hour, acquiring the REO in different periods, to analyze each phase of the ion exchange reaction in the leaching process.
The subsequent sharp voltage increase indicates the end of the ion exchange reaction.
"I think the economic benefit (of the ion exchange plant) would be hard to estimate, but I probably wouldn't want to build a new hotel in Gautier with the condition of the water today," Abell said.
The use of ion exchange resins are also commonly reported for removal of various contaminants from water particularly dissolved solids [17].
Effect of Pretreatment Methods on Ion Exchange Capacity of Modified Rice Straw and Modified Bagasse.
The effect of temperature on the ion exchange capacity of the most efficient prepared nanozirconium tungstovanadate was determined by heating 0.5 g from the ion exchange material at various temperatures in muffle furnace for 1 h.
Thermax Inc, a company that focuses on providing sustainable solutions in energy and environment applications, is increasing prices for its TULSION(R) ion exchange resins sold in North America, effective immediately or as contracts allow.
ResinTech and its Aries Filter-works division offer a 1-2 punch with their ion exchange technology and laboratory water systems.
The first patent includes the use of ion exchange resins in immediate-release and extended-release oral dosage forms.