Determination of selenium in food supplements by differential-pulse cathodic stripping voltammetry in the presence of added copper

1 January 1994

journal article
research article
Published by Royal Society of Chemistry (RSC) in The Analyst

Vol. 119 (10) , 2179-2182
https://doi.org/10.1039/an9941902179

Abstract

Selenium was determined by cathodic stripping voltammetry in a 1 mol l^–1 HCl acid solution containing added Cu^II. In this medium, selenium was preconcentrated on the hanging mercury drop electrode and stripped cathodically in differential-pulse mode. After a deposition period of 1 min, 0.2 ng ml^–1 of selenium could be detected. The method was applied to the analysis of food supplements. Total selenium was determined after digestion of the sample with HNO₃—HClO₄ and reduction to the electroactive Se^IV by heating with HCl. Inorganic selenium (i.e., selenite and selenate) was similarly determined after extraction with dilute sodium hydroxide solution and clean-up on activated carbon. Representative over-the-counter preparations have been analysed.

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