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 ?
0 77 25 Table 2: pH influence during processing of the enzyme solution by strong anion-exchange resins pH of enzyme Amberlite CG-400 A500P anion-exchange resin solution anion-exchange resin medium Purification PTA Purification PTA degree in activity degree in activity terms of loss, % terms of loss, % color index, % color index, % 4 67 14.
The column (Hamilton, USA) was a PRP-X600 weak base anion-exchange, 7 [micro]m particle size and 50x4.
Research shows that with furfural concentration increase in a reactionary mix the size of exchange capacity and swelling capacity of anion-exchange resin go down.
High-performance anion-exchange chromatography with pulsed amperometric detection using a gold working electrode can be used to determine various carbohydrates in different foodstuff matrices.
1]) neutralized by NaOH (pH = 9); the AMPS or ACPA were in excess of 20% with respect to the formed LDH anion-exchange capacity.
Several patient characteristics that affect both diagnostic sensitivity and specificity have mainly been documented for the anion-exchange methods.
Varcoe studied the effect of humidity on the ionic conductivity of alkaline anion-exchange membranes and found that at high humidity levels, the membranes were good conductors.
Anion-exchange membranes used to assess management impacts on soil nitrate.
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.