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DOI: 10.1039/A701313B (Paper) Reference Section for: J. Anal. At. Spectrom., 1997, 12, 1123-1130

Determination of Silicon in Biological Tissue by Electrothermal Atomic Absorption Spectrometry Using Sampling of Original and Pre-ashed Samples

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M. Hornung and V. Krivan

Abstract

Two methods for the determination of silicon in biological tissue by electrothermal atomic absorption spectrometry using the slurry sampling technique are described. In one of them, a slurry of the tissue and, in the second, a slurry of the ash obtained by separate thermal pre-treatment in an ashing furnace was introduced into the graphite furnace. The second method proved to be superior regarding the elimination of matrix interferences. Optimum sensitivity was obtained by using a mixture of palladium nitrate and magnesium nitrate as modifier. The silicon contents determined were between about 3 and 14 µg g–1 and they were compared with results obtained by other methods and laboratories. The limits of detection of the direct method and the method involving pre-ashing were found to be 0.2 and 0.03 µg g–1, respectively.

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