Reductive stripping chronopotentiometry for selenium in biological materials with a flow system |
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Authors: | H. Eskilsson C. Haraldsson |
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Affiliation: | Department of Analytical and Marine Chemistry, Chalmers University of Technology and University of Gothenburg, Gothenburg S-412 96 Sweden |
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Abstract: | Reductive stripping chronopotentiometry in a flow system is used for determination of selenium in mussels and NBS bovine liver after acid digestion. The automated flow system contains a thin-layer cell with a mercury film electrode. In the deposition step, mercury(II) selenide is formed on the mercury film surface; the stripping step involves reduction to mercury and hydrogen selenide. This reduction is done in a separate solution of almost saturated calcium chloride, which eliminates interferences from oxygen so that solutions need not be deoxygenated. The detection limit is 0.14 μg l?1 selenium at a deposition time of 120 s. |
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