ion exchangen.
/ˌʌɪən ᵻksˈtʃeɪn(d)ʒ/, /ˌʌɪən ɛksˈtʃeɪn(d)ʒ/, U.S. /ˌaɪən ɪksˈtʃeɪndʒ/, /ˌaɪˌɑn ɪksˈtʃeɪndʒ/, /ˌaɪən ɛksˈtʃeɪndʒ/, /ˌaɪˌɑn ɛksˈtʃeɪndʒ/ Chemistry.
An exchange or interchange of ions; spec. the interchange of ions of like charge between an insoluble solid and a solution in contact with it; a procedure involving this process, esp. as used in a laboratory or industrially for separation, purification, or decontamination.
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the world > matter > chemistry > ions, ionization, or electrolysis > [noun] > ion exchange
ion exchange1923
the world > matter > physics > atomic physics > ion > [noun] > ion exchange
ion exchange1923
1923 Chem. Abstr. 17 578 (heading) The ion exchange between the blood corpuscles and the serum.
1950 Sci. Amer. Nov. 51/3 Ion exchange has provided a tool for fascinating studies of the constituents of cell nuclei..which are so similar to one another that they are nearly impossible to separate by conventional means.
1984 Times 3 May 20/5 Examples of ion exchange include water softening, milk softening..extracting antibiotics from fermentation broths and the recovery of valuable metals from waste.
2000 Science 29 Sept. 2326/3 The separation of individual rare earth elements is a difficult process involving solvent extraction or ion exchange.
2004 D. E. Briggs et al. Brewing iii. 62 More often [water] softening is carried out by ion exchange.
Compounds
C1. General attributive.
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1936 U.K. Patent 450,574 1 (heading) Improvements relating to the manufacture of ion exchange materials.
1954 T. Vickerstaff Physical Chem. Dyeing (ed. 2) ii. 22 In the case of dyes which yield soluble free acids, Vickerstaff and Lemin have employed ion exchange agents to remove sodium ions.
1963 Guardian 28 Feb. 18/1 An experimental pilot plant to examine the problems in the removal of strontium 90 from milk by an ion-exchange process.
1970 J. Blish Spock must Die! ix. 62 An ion exchange column and a counter-current distributor were the only parts of this rig that I recognized.
2006 M. Pollan Omnivore's Dilemma v. 89 The corn syrup..is exposed to glucose isomerase enzymes and then passed through ion exchange filters, emerging eventually as fructose.
C2.
ion-exchange chromatography n. a technique for separating and analysing ions or polar molecules in a solution by passing it through a column whose contents have charged surfaces which attract, and so slow, the ions to an extent which varies with their size and charge.
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1949 Science 15 Apr. 377/2 We were led independently to its use through our earlier experience with radioisotope separation by ion exchange chromatography.
1964 Oceanogr. & Marine Biol. 2 149 The amino acid compositions of phytoplankton and pure cultures of phytoplanktonic species have been determined by paper chromatography and by ion-exchange chromatography.
2004 This is Bucks. (Nexis) 1 Mar. Amanda's work during the degree included separating samples using ion exchange chromatography.
ion-exchange polymer n. = ion-exchange resin n.
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1954 U.S. Patent 2,686,774 3 The preparation of ion-exchange polymers.
1986 D. C. White in J. S. Poindexter & E. R. Leadbetter Bacteria in Nature II. iv. 181 All three types of anionic polymers can act as ion-exchange polymers.., a property that can protect some bacteria from toxic metallic salts.
2011 Desalination 278 92/1 Ethanol and de-ionized water were used as precipitating agents for preparing the ion-exchange polymer.
ion-exchange resin n. a synthetic polymer suitable for use in ion exchange.Such polymers are commonly characterized by a cross-linked molecular network which allows the penetration of both solvent and ions, and has ionized or ionizable groups attached to it. They are usually used in the form of small beads or a membrane.
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the world > matter > chemistry > ions, ionization, or electrolysis > [noun] > ion exchange > substance capable of
base-exchanger1930
ion-exchange resin1941
1941 U.S. Patent 2,230,641 1/2 The ion exchange resins may be used in all manners known at present involving ion-exchange reactions, among them being the purification of water and..solutions of chemicals.
1991 New Scientist 30 Mar. 20/1 They propose using bacterial cultures or ion exchange resins to remove the malic acid from freeze-dried raw coffee.
2011 Charleston (W. Virginia) Daily Mail (Nexis) 9 Mar. (Life section) 1 Brita filtration pitchers contain activated carbon and an ion-exchange resin that helps reduce..chlorine and mercury, which may be found in tap water.
This entry has been updated (OED Third Edition, March 2012; most recently modified version published online March 2022).
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n.1923