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Title
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Interference-free determination of selenium(iv) by capillary gas chromatography-microwave-induced plasma-atomic emission-spectrometry after volatilization with sodium tetraethylborate
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Author
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Abstract
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| Quantitative volatilization of Se-IV from aqueous solutions by its reaction with sodium tetraethylborate was developed and was followed by the determination of selenium by capillary gas chromatography-microwave-induced plasma atomic emission sepectrometry. An essential increase in the selectivity of the determination was observed compared with the commonly used gas chromatography-hydride generation atomic absorption spectrometry. The influence of the medium on the efficiency of the reaction was studied. Hydrochloric acid of 4 mol l(-1) was necessary to achieve maximum efficiency in the derivatization. The possibility of applying the derivatizating reaction for the selective determination of Se-IV in presence of Se-VI is discussed. A microwave-induced plasma was used as an atomizer. A detection limit of 8 ng l(-1) (for a 5 ml sample) in a fully automated system was achieved. The method was applied to the determination of selenium in natural water samples. |
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Language
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English
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Source (journal)
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Journal of analytical atomic spectrometry. - London
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Publication
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London
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1995
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ISSN
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0267-9477
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Volume/pages
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10
:2
(1995)
, p. 111-115
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ISI
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A1995QL03300007
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