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Preconcentration and separation of inorganic selenium species on activated alumina

Preconcentration and separation of inorganic selenium species on activated alumina

Analytica Chimica Acta 363(2-3): 141-146

A simple and convenient method has been developed for the speciation of inorganic selenium in aqueous solutions using alumina microcolumn. Both Se(IV) and Se(VI) are retained on the microcolumn in a widely pH range of solution. The successive gradient elution of preconcentrated species with ammonia solution allows to differentiate between them. Se(VI) and Se(IV) were eluted with 1 ml of 1 mol l-1 NH3 and 6 ml of 4 mol l-1 NH3, respectively, and determined by graphite furnace atomic absorption spectrometry. The detection limit for Se(VI) is 0.80 mug ml-1 and for Se(IV) 49 ng l-1. The method has been applied to the speciation of inorganic selenium in natural water samples.

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Accession: 009225979

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DOI: 10.1016/s0003-2670(98)00122-6

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