Measurement of total selenium and selenium(IV) in seawater by stripping chronopotentiometry.
Anal Bioanal Chem
; 379(7-8): 1113-9, 2004 Aug.
Article
in En
| MEDLINE
| ID: mdl-15249990
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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Database:
MEDLINE
Main subject:
Potentiometry
/
Seawater
/
Selenium
Type of study:
Diagnostic_studies
Language:
En
Journal:
Anal Bioanal Chem
Year:
2004
Type:
Article
Affiliation country:
France