Measurement of total selenium and selenium(IV) in seawater by stripping chronopotentiometry

Abstract : We developed a stripping chronopotentiometric method (constant current stripping analysis, CCSA) with a mercury film electrode for selenium quantification in seawater. A sensitivity and detection limit of 222 ms ng–1 l and 4 ng l–1 (50 pM), respectively, were accomplished for a 3-min electrolysis time. Compared to the other chronopotentiometric methods available for a single selenium measurement only in natural waters, our procedure exhibits a ten times better sensitivity. It, therefore, allows one to reach the current concentration thresholds found in coastal and oceanic waters (30–200 ng l–1). Moreover, a simple change in operating conditions enables one to also quantify Se(IV), a toxic dissolved species. With respect to the other electrochemical methods of current use, our procedure is beneficial because of its ease-of-use: it needs neither degassing step, nor catalyser.
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Article dans une revue
Analytical and Bioanalytical Chemistry, Springer Verlag, 2004, 379, pp.1113
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http://hal.univ-brest.fr/hal-00451253
Contributeur : Matthieu Waeles <>
Soumis le : jeudi 28 janvier 2010 - 15:55:15
Dernière modification le : jeudi 11 janvier 2018 - 06:22:24

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  • HAL Id : hal-00451253, version 1

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Ricardo Riso, Matthieu Waeles, Sébastien Garbarino, Pierre Le Corre. Measurement of total selenium and selenium(IV) in seawater by stripping chronopotentiometry. Analytical and Bioanalytical Chemistry, Springer Verlag, 2004, 379, pp.1113. 〈hal-00451253〉

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