TITLE

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

AUTHOR(S)
Riso, Ricardo D.; Waeles, Matthieu; Garbarino, Sébastien; Le Corre, Pierre
PUB. DATE
August 2004
SOURCE
Analytical & Bioanalytical Chemistry;Aug2004, Vol. 379 Issue 7/8, p1113
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
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-mm 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.
ACCESSION #
14281852

 

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