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ion exchange
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    Also found in: Medical, Encyclopedia, Wikipedia 0.01 sec.

ion exchange

Process whereby an ion in one compound is replaced by a different ion, of the same charge, from another compound. Ion exchange is used in commercial water softeners to exchange the dissolved ions responsible for the water's hardness with others that do not have this effect. For example, when hard water is passed over an ion-exchange resin, the dissolved calcium and magnesium ions are replaced by either sodium or hydrogen ions, so the hardness is removed. The addition of washing soda to hard water is also an example of ion exchange:

Na2CO3(aq) + CaSO4(aq) → CaCO3(s) + Na2SO4(aq)

Ion exchange is the basis of a type of chromatography in which the components of a mixture of ions in solution are separated according to the ease with which they will replace the ions on the polymer matrix through which they flow. The exchange of positively charged ions is called cation exchange; that of negatively charged ions is called anion exchange.



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? Mentioned in ? References in periodicals archive
 
1996) or multistep separation involved in heparin-affinity, anion-exchange, and metal-chelate affinity chromatography (Mostert et al.
The roles of serum selenium and selenoproteins on mercury toxicity in ... by Chai, Zhifang / Environmental Health Perspectives
Baseline separation was achieved for all six species as well as for the internal standard (potassium hexahydroxy antimonate V) in a single chromatographic run of less than 30 min, using an ammonium carbonate buffer gradient (between 10 and 50 mM) at ambient temperature, in conjunction with cation- and anion-exchange columns in series.
Development and application of a robust speciation method for ... by Akinbo, Olujide / Environmental Health Perspectives
CSM, a highly charged quaternary, ammonium resin, may act as an absorbent by binding toxins through its strong anion-exchange capacity or by entrapment of molecules in its polymeric structure.
Possible Estuary-Associated Syndrome: Symptoms, Vision, and Treatment by Hudnell, H. Kenneth / Environmental Health Perspectives
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