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Determination of trace selenium in biological material by preconcentration and x-ray emission spectrometry

✍ Scribed by H. Robberecht; R. van Grieken

Publisher
Elsevier Science
Year
1983
Tongue
English
Weight
639 KB
Volume
147
Category
Article
ISSN
0003-2670

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✦ Synopsis

Selenium is determined in the ng g-' to rg g-' range in biological and environmental samples. A wet digestion procedure was optimized with respect to volatility losses and recovery yields, by using "Se metabolically incorporated into rat organs. Selenium is preconcentrated from the digestion liquid by a two-step reduction with 4 M HCl and ascorbic acid. The colloidal selenium formed is adsorbed on activated carbon and filtered on a Nuclepore membrane for measurement by energy-dispersive x-ray fluorescence. Almost complete recovery was obtained, and the detection limit was 20 ng, corresponding to 10 ng g-' for a 2-g sample. Biological reference materials were analyzed with satisfactory results, and the accuracy of the method was good.

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