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Titolo:
BUFFERED CHROMATE ELECTROLYTES FOR SEPARATION AND INDIRECT ABSORBENCYDETECTION OF INORGANIC ANIONS IN CAPILLARY ELECTROPHORESIS
Autore:
DOBLE P; MACKA M; ANDERSSON P; HADDAD PR;
Indirizzi:
UNIV TASMANIA,DEPT CHEM,GPO BOX 252-75 HOBART TAS 7001 AUSTRALIA UNIV TASMANIA,DEPT CHEM HOBART TAS 7001 AUSTRALIA
Titolo Testata:
Analytical communications
fascicolo: 11, volume: 34, anno: 1997,
pagine: 351 - 353
SICI:
1359-7337(1997)34:11<351:BCEFSA>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOLECULAR-MASS ANIONS; INDIRECT UV DETECTION; ZONE ELECTROPHORESIS; ION ELECTROPHORESIS; BAYER LIQUOR; OPTIMIZATION; SELECTIVITY; CHROMATOGRAPHY; INDUSTRY;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
28
Recensione:
Indirizzi per estratti:
Citazione:
P. Doble et al., "BUFFERED CHROMATE ELECTROLYTES FOR SEPARATION AND INDIRECT ABSORBENCYDETECTION OF INORGANIC ANIONS IN CAPILLARY ELECTROPHORESIS", Analytical communications, 34(11), 1997, pp. 351-353

Abstract

Chromate is the most commonly used carrier electrolyte for the determination of low molecular weight and inorganic anions by capillary electrophoresis. However, chromate electrolytes are usually prepared in the sodium form and consequently have poor buffering capacity, Addition of anionic buffers that introduce competing co-anions is undesirable because they can reduce the sensitivity of indirect detection and causeinterfering system peaks, An approach is demonstrated to buffer a chromate electrolyte by using a suitable buffering base as a counter-ion of the chromate, This approach does not introduce any co-anions into the background electrolyte, which is prepared by titrating the acid form of chromate to the pK(a) of the added base, Two buffered electrolytes were investigated containing tris(hydroxymethyl)amino-ethane (pK(a) = 8.5) or diethanolamine, (pK(a) = 9.2), The analytical performance characteristics of the buffered electrolytes were compared with the unbuffered chromate electrolyte. Both systems showed similar separation selectivity, efficiency and detection sensitivity, but the buffered electrolytes shelved superior repeatability for migration times and peak areas, as well as a significantly greater tolerance to alkaline sample matrices.

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Documento generato il 10/07/20 alle ore 15:52:52