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Titolo:
Separation of niobium(V) and tantalum(V) as ternary complexes with citrateand metallochromic ligands by capillary electrophoresis
Autore:
Vachirapatama, N; Doble, P; Yu, ZS; 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 Univ Tasmania, Sch Earth Sci, Hobart, Tas 7001, Australia Univ Tasmania Hobart Tas Australia 7001 Sci, Hobart, Tas 7001, Australia
Titolo Testata:
ANALYTICA CHIMICA ACTA
fascicolo: 2, volume: 434, anno: 2001,
pagine: 301 - 307
SICI:
0003-2670(20010511)434:2<301:SONATA>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
PERFORMANCE LIQUID-CHROMATOGRAPHY; GEOLOGICAL SAMPLES; NB/TA; TIN;
Keywords:
capillary electrophoresis; metallochromic ligands; niobium(V); tantalum(V); ternary complexes;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
11
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:
N. Vachirapatama et al., "Separation of niobium(V) and tantalum(V) as ternary complexes with citrateand metallochromic ligands by capillary electrophoresis", ANALYT CHIM, 434(2), 2001, pp. 301-307

Abstract

A method was developed for the determination of Nb(V) and Ta(V) as anionicternary complexes of a metallochromic ligand and citrate as the auxiliary ligand by capillary electrophoresis. Three metallochromic ligands were evaluated, namely 4-(2-pyridylazo) resorcinol (PAR), 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (Br-PADAP) and 2-(5-bromo-2-pyridylazo)-5-[N-propyl-N-(3-sulfopropyl)amino]-phenol (Br-PAPS). Each complex was detected spectrophotometrically using a light-emitting diode (LED) at 568 nm. The separation of Nb(V) and Ta(V) was optimised for all three ligands, of which PAR displayed the best analytical method performance parameters, with detection limitsof 9.1 and 25.2 mug/l for Nb(V) and Ta(V). respectively, using a 20 s injection time and linear ranges of 25-1000 and 50-4000 mug/l for Nb(V) and Ta(V), respectively, The method was applied to the analysis of representative rock samples. Cleanup of the digested rock samples with a C18 pre-column coated with tetrabutylammonium hydroxide prior to analysis was used to removeexcess salts which otherwise caused electrophoretic de-stacking. It was found that Nb(V) could be determined satisfactorily at natural levels in the tested reference rock materials (granite and basalt), but Ta(V) was below the detection limit for these samples. The values of Nb(V) found by the proposed method agreed well with the certified values and with results obtainedby inductively coupled plasma-mass spectrometry (ICP-MS). (C) 2001 Elsevier Science B,V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/07/20 alle ore 18:02:01