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A comparison of two digestion procedures for the determination of selenium in biological material
L Hansson1, J Pettersson, A Olin
1Department of Analytical Chemistry, University of Uppsala, P.O. Box 531, S-751 21 Uppsala, Sweden.
Abstract:
Two digestion procedures have been tested on samples of flour, blood and urine for application in the determination of selenium by hydride-generation atomic-absorption spectrometry. The first utilizes a mixture of concentrated nitric, perchloric and sulphuric acids and the second a mixture of magnesium nitrate hexahydrate, concentrated nitric acid and 6M hydrochloric acid. The accuracy of the procedures was tested by analysis of standard reference materials and by comparison with results from neutron-activation analysis. It was found that the "magnesium method" can replace the more common procedure, which includes perchloric acid, for the sample types investigated in this paper.
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