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Titolo:
Open-tubular ion-exchange capillary electrochromatography of inorganic anions
Autore:
Breadmore, MC; Macka, M; Avdalovic, N; Haddad, PR;
Indirizzi:
Univ Tasmania, Hobart, Tas 7001, Australia Univ Tasmania Hobart Tas Australia 7001 ania, Hobart, Tas 7001, Australia Dionex Corp, Sunnyvale, CA 94086 USA Dionex Corp Sunnyvale CA USA 94086Dionex Corp, Sunnyvale, CA 94086 USA
Titolo Testata:
ANALYST
fascicolo: 7, volume: 125, anno: 2000,
pagine: 1235 - 1241
SICI:
0003-2654(2000)125:7<1235:OICEOI>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
LIQUID-CHROMATOGRAPHY; ELECTROPHORESIS; SEPARATION; MIGRATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Haddad, PR Univ Tasmania, GPO Box 252-75, Hobart, Tas 7001, Australia UnivTasmania GPO Box 252-75 Hobart Tas Australia 7001 ustralia
Citazione:
M.C. Breadmore et al., "Open-tubular ion-exchange capillary electrochromatography of inorganic anions", ANALYST, 125(7), 2000, pp. 1235-1241

Abstract

The viability of open-tubular ion-exchange electrochromatography (IE-CEC) for the separation of inorganic anions was investigated. Open-tubular IE-CEC columns were prepared by coating the inner wall of a fused silica capillary with quaternary ammonium anion-exchange latex particles (approximately 75 nm in diameter) bound electrostatically to the wall. Dionex AS5A latex particles were used for this purpose. The coated capillary showed reversed electro-osmotic flow (EOF), allowing anions to be separated in the co-EOF mode. The latex particles on the capillary wall introduced anion-exchange interactions with the analytes, the strength of which could be moderated by thetype and concentration of the competing ion used in the background electrolyte (BGE). With a relatively low concentration of a weak competing ion (e.g., chloride), the migration order followed that obtained in an anion-exchange system. Increasing the concentration of the competing ion resulted in adecrease in the ion-exchange interactions and a change in the migration order from that obtained by capillary electrophoresis using a high ionic BGE. A stronger competing ion (e.g., perchlorate or sulfate) suppresses the anion-exchange interaction at a lower BGE concentration. The effective ion-exchange capacity of the capillary, and also the resulting anion-exchange interactions with the analytes, could be increased by decreasing the capillary diameter. The approaches described in this paper provide a simple means to manipulate separation selectivity for inorganic anions.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 13/07/20 alle ore 03:20:54