Analysis of commercial selenium-supplement tablets.
Commercially available selenium-supplement tablets, obtained from a supermarket and a health food store in several lots were analyzed to compare reported and observed values of total selenium. Atomic absorption spectrometry with a hydride generator was used, and the results were confirmed for selected lots using inductively coupled plasma (ICP) spectrometry. Results indicate more variation than might be suspected. Several lots contained a significantly higher amount of selenium than reported with one lot having 50% more. One brand contained only 20-25% of the reported concentration, a significantly lower amount. Tablets were analyzed and compared to determine which brand, if any, had the most reliable amount per tablet.
Florida Academy of Sciences
Carvalho, K.M., Benson, R. F., Booth, F.A., Collier, M.J. & Martin, D.F. (2000). Analysis of commercial selenium-supplement tablets. Florida Scientist, 63, 8-12.
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