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Titolo:
ROLE OF LIGAND PURITY IN SEPARATIONS OF ALKALINE-EARTH METALS AS ARSENAZO-I COMPLEXES BY CAPILLARY-ZONE-ELECTROPHORESIS
Autore:
MACKA M; PAULL B; BOGAN DP; 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:
Journal of chromatography
fascicolo: 1, volume: 793, anno: 1998,
pagine: 177 - 185
Fonte:
ISI
Lingua:
ENG
Soggetto:
SENSITIVE DETERMINATION; IONS; CHROMATOGRAPHY; IRON; COLUMN; ACID;
Keywords:
COMPLEXATION; LIGAND PURITY; ALKALINE EARTH METALS; METAL COMPLEXES; ARSENAZO I; METAL CATIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
M. Macka et al., "ROLE OF LIGAND PURITY IN SEPARATIONS OF ALKALINE-EARTH METALS AS ARSENAZO-I COMPLEXES BY CAPILLARY-ZONE-ELECTROPHORESIS", Journal of chromatography, 793(1), 1998, pp. 177-185

Abstract

In the separation of metal ions by capillary electrophoresis in the form of kinetically labile complexes formed through the incorporation of an auxiliary complexing ligand into the background electrolyte (BGE), it has been shown that the purity of this auxiliary complexing ligand can play a crucial role in the selectivity and efficiency of the resultant separations. Using the separation of alkaline earth metals as complexes with the metallochromic ligand arsenate I as a model system, the effects of the addition of low concentrations of simulated impurities, in the form of various metal ions and competing ligands, were studied, Additions of Fe-III at low micromolar levels to a BGE containing1 mM arsenate I resulted in severe peak tailing. The addition of the competing ligands diethylenetriaminepentaacetic acid (DTPA) or arsenate III, at a molar ratio as low as 1:1000 to arsenate I, also caused substantial peak broadening and altered the separation selectivity. The practical implications of the above results for the separation of metals as labile complexes, using capillary zone electrophoresis (CZE) systems similar to the above, are discussed. (C) 1998 Elsevier Science B.V.

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Documento generato il 09/08/20 alle ore 22:45:21