Determination of trace inorganic selenium in organoselenium (selenosugar) oral nutrition liquids by graphite furnace atomic absorption spectrometry with hydride generation |
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Authors: | Zhang De-qiang Sun Han-wen Yang Li-li |
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Institution: | (1) Department of Chemistry, Hebei University, Baoding 071002, P.R. China, CN |
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Abstract: | A method has been proposed for the determination of trace levels of inorganic selenium in organoselenium (selenosugar) oral
nutrition liquids using hydride generation-graphite furnace atomic absorption spectrometry (HG-GFAAS), taking advantage of
the fact that this organic selenium compound did not generate volatile hydride upon reduction. K2S2O8 was selected for the decomposition of the compound in a boiling water bath. Selenium was found to give a sharp analytical
signal upon reduction with NaBH4 in 1.0 mol L-1HCl medium. The characteristic mass giving an integrated absorbance of 0.0044 s was 21 pg. An absolute detection limit (3s)
of 36 pg was obtained. The recovery was in the range of 94.2–102.1%. Less than parts per million levels of inorganic Se in
the presence of organic selenium can be determined.
Received: 7 November 1996/Revised: 13 January 1997/Accepted: 29 January 1997 |
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