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

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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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Acknowledgements

We sincerely thank Jean-Pierre Oldra for pre-treating the glassy carbon electrode surface with great skill and Dr Marie-Paule Friocourt for revising English.

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  1. Laboratoire de Chimie Marine, Université de Bretagne Occidentale (IUEM), UMR CNRS 7127 Roscoff, Place Nicolas Copernic, Technopôle Brest-Iroise, 29280, Plouzané, France

    Ricardo D. Riso, Matthieu Waeles, Sébastien Garbarino & Pierre Le Corre

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  1. Ricardo D. Riso
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  2. Matthieu Waeles
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  3. Sébastien Garbarino
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  4. Pierre Le Corre
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Correspondence to Ricardo D. Riso.

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Riso, R.D., Waeles, M., Garbarino, S. et al. Measurement of total selenium and selenium(IV) in seawater by stripping chronopotentiometry. Anal Bioanal Chem 379, 1113–1119 (2004). https://doi.org/10.1007/s00216-004-2677-z

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  • DOI: https://doi.org/10.1007/s00216-004-2677-z

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