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.

anion exchange

the process by which a liquid-phase ion exchanges with an ion that was previously bound to a positively charged solid
References in periodicals archive ?
The anion exchange method in chloride and hydrochloric acid solution had been applied for purification of Co, as reported by by Dubois et al [19] in 1969, Nardin et al [20] in 1970, and Isshiki et al [21] in 1985, and they reported good results for separation of metallic impurities from cobalt chloride.
Batch decolorization experiments were conducted with the crude filtered vancomycin broth by adding 1g (based on dry weight) of various anion exchange resins to 20mL of broth, and shaking the contents for four hours.
003] basal spacing of the obtained products (Table 1) indicated a successful intercalation of organic anions into the LDH interlayer space, when anion exchange was applied.
Micro anion exchange chromatography of carbohydrate-deficient transferrin in serum in relation to alcohol consumption (Swedish patent 8400587-5).
As part of an ongoing City of Glendale research program, this study evaluates six weak-base anion exchange resins for hexavalent chromium [Cr(VI)] removal from groundwater, tests the highest operating pH for Duolite A7 and ResinTech SIR-700, and analyzes the weak-base anion resin residuals.
Three nodal roots were gently exposed and sampled non-destructively with anion exchange membranes placed on tip and mature root regions.
Anion exchange membrane strips were inserted into the soil by making a slit at an angle of approximately 15[degrees] from vertical with a mason's trowel.
A number of lipid lowering drugs are available to combat high cholesterol levels and include statins, anion exchange resins and fibrates.
Know the difference between cation and anion exchange capacity.
Estimate cation and anion exchange capacity (CEC and AEC) based on characteristics of the soil constituents.