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Separation and determination of niobium(V) and tantalum(V) as 2-(5-bromo-2-pyridylazo)-5-[N-propyl-N-(3-sulfopropyl)amino]phenol citrate ternary complexes in geological samples using ion interaction high-performance liquid chromatography

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Vachirapatama, N and Doble, P and Haddad, PR (2000) Separation and determination of niobium(V) and tantalum(V) as 2-(5-bromo-2-pyridylazo)-5-[N-propyl-N-(3-sulfopropyl)amino]phenol citrate ternary complexes in geological samples using ion interaction high-performance liquid chromatography. Analytica Chimica Acta, 409 (1-2). pp. 35-43. ISSN 0003-2670

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Abstract

A method for the simultaneous separation and determination of Nb(V) and Ta(V) as ternary complexes formed with 2-(5-bromo-2-pyridylazo)-5-[N-propyl-N-(3-sulfopropyl)amino]phenol (PAPS) and citrate was developed using ion interaction reversed-phase high-performance liquid chromatography (HPLC) on a C18 column. An artificial neural network (ANN) in combination with a reduced factorial experimental design was utilised to optimise the mobile phase compositions and the conditions used for pre-column complex formation. Under the optimum conditions determined by the ANN, the Nb(V) and Ta(V) complexes were eluted within 5 min. The detection limits (signal to noise ratio = 3, detection wavelength 600 nm) for Nb(V) and Ta(V) were 0.03 and 0.40 μg/l, respectively, which correspond to 0.03 and 0.40 μg/g in the solid samples. The method was applied to the analysis of geological samples and the results obtained by the HPLC method agreed well with the results obtained by ICP-MS and also with the certified values.

Item Type: Article
Keywords: Niobium(V); Tantalum(V); 2-(5-bromo-2-pyridylazo)-5-[N-propyl-N-(3-sulfopropyl)amino]phenol (PAPS); High-performance liquid chromatography
Journal or Publication Title: Analytica Chimica Acta
Page Range: pp. 35-43
ISSN: 0003-2670
Identification Number - DOI: 10.1016/S0003-2670(99)00815-6
Additional Information: The definitive version is available at http://www.sciencedirect.com
Date Deposited: 31 Oct 2008 06:09
Last Modified: 18 Nov 2014 03:52
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