Measurement of total selenium and selenium(IV) in seawater by stripping chronopotentiometry |
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Authors: | Email author" target="_blank">Ricardo?D?RisoEmail author Matthieu?Waeles Sébastien?Garbarino Pierre?Le?Corre |
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Institution: | (1) Laboratoire de Chimie Marine, Université de Bretagne Occidentale (IUEM), UMR CNRS 7127 Roscoff, Place Nicolas Copernic, Technopôle Brest-Iroise, 29280 Plouzané, France |
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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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Keywords: | Stripping chronopotentiometry Selenium Selenium(IV) Seawater |
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