ion-exchange

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ion-exchange resin
Any of a wide variety of synthetic polymers containing positively or negatively charged sites that can interact with or bind to an ion of opposite charge from a surrounding solution. Light, porous solids in granules, beads, or sheets, they absorb the solution and swell as they attract the target ions; when exhausted, they are removed from use and regenerated by an inexpensive brine or carbonate solution. A solid support of styrene-divinylbenzene copolymer to which are attached sulfonic or carboxylic acid groups is often used to attract and exchange cations (e.g., ions of hydrogen or metals). Quaternary ammonium groups on the solid matrix are used to attract anions (e.g., ions of chlorine). Industrially, the resins are used to soften hard water, purify sugar, and concentrate valuable elements (gold, silver, uranium) from their ores. In the laboratory they are used to separate and concentrate substances and sometimes as catalysts. Zeolites are minerals with ion-exchange properties
ion exchange
the reversible process whereby ions are exchanged between a solution and a solid or gel; the process used in a water softener
ion exchange chromatography
A technique that uses ion exchange to separate compounds, anions and cations according to their electrical properties
ion exchange resin
An insoluble matrix of small beads having a charged surface; used as an artificial zeolite in water softeners and in ion exchange chromatography
ion exchange resins
plural form of ion exchange resin
ion exchange
a process in which ions are exchanged between a solution and an insoluble (usually resinous) solid; widely used in industrial processing
ion exchange
A reversible chemical reaction between an insoluble solid and a solution during which ions may be interchanged, used in water softening and in the separation of radioactive isotopes