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Determination of niobium(V) and tantalum(V) as 4-(2-pyridylazo)resorcinol-citrate ternary complexes in geological materials by ion-interaction reversed-phase high-performance liquid chromatography

Citation

Vachirapatama, N and Macka, M and Paull, B and Munker, C and Haddad, PR, Determination of niobium(V) and tantalum(V) as 4-(2-pyridylazo)resorcinol-citrate ternary complexes in geological materials by ion-interaction reversed-phase high-performance liquid chromatography, Journal of Chromatography A, 850, (1-2) pp. 257-268. ISSN 0021-9673 (1999) [Refereed Article]

DOI: doi:10.1016/S0021-9673(99)00143-0

Abstract

A method for the simultaneous separation and determination of Nb(V) and Ta(V) as ternary complexes formed with 4-(2-pyridylazo)resorcinol (PAR) and citrate was developed using ion-interaction reversed-phase high-performance liquid chromatography on a C18 column. Method parameters, such as pre-column complex formation conditions and composition of the complexes were investigated using spectrophotometry and HPLC. Under the optimum conditions, the Nb(V) and Ta(V) complexes were eluted within 12 min with a mobile phase of methanol-water (32:68, v/v) containing 5 mM acetate, 5 mM TBABr and 5 mM citrate buffer at pH 6.5, with detection at 540 nm. A typical separation efficiency was 33 000 and 20 000 theoretical plates per metre for Nb(V) and Ta(V), respectively. The relative standard deviation of retention times for the Nb(V) and Ta(V) complexes were 0.16% and 0.17% and for peak areas were 0.28% and 1.36%, respectively. The detection limits (signal-to-noise ratio=3) for Nb(V) and Ta(V) were 0.4 ppb and 1.4 ppb, respectively. Results obtained for standard reference rock samples agreed well with certified values and results obtained by inductively coupled plasma MS. Copyright (C) 1999 Elsevier Science B.V.

Item Details

Item Type:Refereed Article
Research Division:Chemical Sciences
Research Group:Analytical Chemistry
Research Field:Separation Science
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Chemical Sciences
Author:Vachirapatama, N (Dr Narumol Vachirapatama)
Author:Macka, M (Professor Mirek Macka)
Author:Paull, B (Professor Brett Paull)
Author:Munker, C (Dr Carsten Munker)
Author:Haddad, PR (Professor Paul Haddad)
ID Code:16213
Year Published:1999
Web of Science® Times Cited:17
Deposited By:Chemistry
Deposited On:1999-08-01
Last Modified:2011-08-04
Downloads:0

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