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Titolo:
Modification of the electroosmotic flow and separation selectivity of anions in electrochromatography with pseudo-stationary phases of C-14-alkyldimethylammoniopropane sulfonate zwitterionic surfactants by addition of salts to the background electrolyte
Autore:
Yokoyama, T; Macka, M; Haddad, PR;
Indirizzi:
Univ Tasmania, Sch Chem, Australian Ctr Res Separat Sci, Hobart, Tas 7001,Australia Univ Tasmania Hobart Tas Australia 7001 t Sci, Hobart, Tas 7001,Australia
Titolo Testata:
FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY
fascicolo: 4, volume: 371, anno: 2001,
pagine: 502 - 506
SICI:
0937-0633(200110)371:4<502:MOTEFA>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTROSTATIC ION CHROMATOGRAPHY; EXCHANGE CAPILLARY ELECTROCHROMATOGRAPHY; ELECTROPHORESIS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Haddad, PR Univ Tasmania, Sch Chem, Australian Ctr Res Separat Sci, GPO Box 252-75, Hobart, Tas 7001, Australia Univ Tasmania GPO Box 252-75 Hobart Tas Australia 7001 ustralia
Citazione:
T. Yokoyama et al., "Modification of the electroosmotic flow and separation selectivity of anions in electrochromatography with pseudo-stationary phases of C-14-alkyldimethylammoniopropane sulfonate zwitterionic surfactants by addition of salts to the background electrolyte", FRESEN J AN, 371(4), 2001, pp. 502-506

Abstract

The effects of salts (NaCl, NaClO4, MgCl2, CeCl3) added to background electrolyte (BGE) solutions (10 mmol L-1 sodium phosphate, pH 7.2) on electroosmotic flow (EOF) and the separation selectivity of anions (chloride, bromide, iodide, nitrite, nitrate, chlorate, thiocyanate, iodate, chromate, and molybdate ion) by capillary electrochromatography using the zwitterionic surfactant 3-(N,N-dimethylmyristylammonio)propane sulfonate (C14N3S) as a pseudo-stationary phase were investigated. There are two mechanisms affecting the separations:1. the cations and anions of the added salts interact with the zwitterionic surfactant to varying degrees, thus changing the overall retention of theanalytes; and2. they change the EOF and the resulting apparent mobilities. It was shown that a BGE containing perchlorate and a low concentration of zwitterionic surfactant (2 mmol L-1) gave a stable and reproducible EOF andthe concentration of perchlorate could be used to manipulate the separation selectivity for polarizable anions, such as iodide and thiocyanate. Theseeffects are discussed in terms of measured association constants describing the interaction of anions and cations with the zwitterion.

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Documento generato il 10/04/20 alle ore 15:55:28