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Titolo:
Amperometric ion detection in capillary zone electrophoresis by ion transfer across a liquid-liquid microinterface
Autore:
Wilke, S; Schurz, R; Wang, HM;
Indirizzi:
Univ Halle Wittenberg, Dept Chem Merseburg, D-06099 Halle, Germany Univ Halle Wittenberg Halle Germany D-06099 burg, D-06099 Halle, Germany
Titolo Testata:
ANALYTICAL CHEMISTRY
fascicolo: 6, volume: 73, anno: 2001,
pagine: 1146 - 1154
SICI:
0003-2700(20010315)73:6<1146:AIDICZ>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
IMMISCIBLE ELECTROLYTE-SOLUTIONS; INDIRECT PHOTOMETRIC DETECTION; MEMBRANE-STABILIZED INTERFACE; ANIONIC SURFACTANTS; SELECTIVE ELECTRODE; LINEAR ALKYLBENZENESULFONATES; POTENTIOMETRIC DETECTION; NITROBENZENE INTERFACE; CONDUCTIVITY DETECTION; POLARIZATION PHENOMENA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
53
Recensione:
Indirizzi per estratti:
Indirizzo: Wilke, S Univ Halle Wittenberg, Dept Chem Merseburg, D-06099 Halle, Germany Univ Halle Wittenberg Halle Germany D-06099 6099 Halle, Germany
Citazione:
S. Wilke et al., "Amperometric ion detection in capillary zone electrophoresis by ion transfer across a liquid-liquid microinterface", ANALYT CHEM, 73(6), 2001, pp. 1146-1154

Abstract

Ion transfer across the electrically charged interface of two immiscible electrolytes has bf:en employed for the amperometric detection of ions in capillary zone electrophoresis (CE. The method is inherently selective to hydrophobic ions, which are characterized by a low standard Gibbs energy of partition between the aqueous CE buffer solution and 2-nitrophenyl n-octyl ether employeed as organic phase. The applicability of this detection scheme for nonredox ions is demonstrated by means of the cations choline and acetylcholine and by some alkyl and aryl sulfate and sulfonate anions. The response of the detector is sufficiently fast; no additional peak broadening hasbeen observed. Plate numbers of 100 000 (170 000 m(-1)) ere determined forthe quickly migrating choline cation. It is shown that the usc of buffer modifiers such as organic solvent additives, cyclodextrins, and polyelectrolytes is compatible with the detector within certain boundaries. The limit of detection was similar to1 muM for the ions tested.

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Documento generato il 30/09/20 alle ore 09:44:56