cation exchange


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Related to cation exchange: Cation exchange resin, Cation exchange membrane

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). A cation-exchange reaction in removal of the Na+ of a sodium chloride solution is RSO3-H+ + Na+ → RSO3-Na+ + H+ (R is the polymer, RSO3- is the cation exchanger); if this is combined with the anion-exchange reaction, NaCl is removed from the solution (desalting). Cation exchange may also be used chromatographically, to separate cations, and medicinally, to remove a cation, for example, H+, from gastric contents, or Na+ and K+ in the intestine. See: anion 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

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.
See also: exchange
References in periodicals archive ?
Ludwig B, Kolbl A (2002) Modelling cation exchange in columns of disturbed and un-disturbed subsoil.
Figure 10-14 lists cation exchange capacity values for several clays, humus, and soil textures.
The use of cation exchange to achieve a reduction in ammonium ion was intended to make it possible to determine whether there was a relationship between the rate of copper corrosion and the activity of nitrifying organisms in the copper pipe test loop.
Okagbue [29] showed the similar results and explained that these beneficial changes in engineering properties are mainly attributed to cation exchange, flocculation of the clay, agglomeration, and pozzolanic reactions.
However, because the cation exchange characteristics of these SOM fractions have not been determined, it is difficult to predict how their depletion would affect soil CEC.
In order to investigate the effect of cation exchange on the hydrogen adsorption, the curves of the number of hydrogen molecules per cation charge versus pressure at 100 K for [Li.sup.+], [K.sup.+] and [Ca.sup.2+] exchanged X zeolites were simulated as shown in Figure 2.
It has been found that the structure and chemical characteristics of the clay mineral have a strong effect on the cation exchange that is involved in the syntheses of organoclays [7].
RHEO-CLAY: provides a high-inverted yield point (YP)--plastic viscosity (PV) ratio for improved rate of penetration, optimum hole cleaning, and greater liquid/solids separation efficiency from hydrocyclones--differs from sodium bentonite (montmorillonilc) by having lower cation exchange capacity and greater yield in the presence of high hardness (Ca++ / Mg++) and sodium (Na+) values.
Among the factors contributing to different cation exchange capacity (CEC) values by various methods are:
In these soils, the base cation exchange pool is largely dependent on the biomass-soil organic matter system maintaining base cation levels through cycling and capture of cations and nutrients from wetfall and dryfall (Stark and Jordan 1978; Jordan 1982; Lesack and Melack 1996; Poszwa et al.