anion 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.

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.

exchange

(eks-chanj')
1. To give up or substitute something for something else.
2. In dietetics, the substitution of an equivalent amount of one food substance for another so that the caloric intake remains the same. Exchange diets are used frequently to help manage diabetes mellitus, and they have been adapted for use in proprietary weight loss programs.
3. In peritoneal dialysis, to drain fluid from the peritoneal cavity and replace it with fresh dialysate.

anion exchange

See: resin, ion-exchange

cation exchange

The transfer of cations between those in a liquid medium and those in a solid polymer. The polymer is termed the cation exchanger. Cation exchange is used in ion-exchange chromatography and in certain water purifiers.

food exchange

A grouping of commonly consumed foods according to similarities in composition so that the foods may be used interchangeably in diet planning.

sister chromatid exchange

The exchange of corresponding parts of homologous maternal and paternal chromosomes during the first meiotic division. This contributes to genetic diversity in the offspring. Synonym: crossing over

transcapillary exchange

The passage of substances between blood and tissue (interstitial) fluid.
References in periodicals archive ?
Anion exchange resin showed better correlation with sodium bicarbonate, good correlation with ammonium acetate buffer as well as with sodium acetate buffer and non significant correlation with other two extractants.
Zhu, "Synthesis and characterization of cross-linked quaternized poly(vinyl alcohol)/chitosan composite anion exchange membranes for fuel cells," Journal of Power Sources, vol.
The nanohybrids containing hydroxycinnamate isomers were prepared from ZC-Ac by anion exchange; they are referred to herein as ZC-o-HCn, ZC-m-HCn, and ZC-p-HCn for compounds containing the orthoisomer, metaisomer, and paraisomer, respectively.
After the anion exchange separation the highly purified CoCl2 solution was evaporated to dryness to obtain anhydrous CoCl2.
Both methods use anion exchange chromatography followed by diphenylcarbazide (DPC) post-column chemistry.
The second portion of the study examined the use of a low cost, strongly basic anion exchange resin for decolorization of the crude vancomycin broth.
All methods mentioned above, i.e., coprecipitation, anion exchange, and rehydration can be applied for intercalation of polymer molecules into LDH structure.
Older methods, such as isoelectric focusing, produced better results than anion exchange, even in studies that reported paired comparisons in which the same samples were analyzed with both methods.
Hexavalent chromium removal using anion exchange and reduction with coagulation and filtration.