Determination of trace selenium on hanging copper amalgam drop electrode

Hanging copper amalgam drop electrode has been applied for trace determination of selenium by cathodic stripping analysis. Detection limit for Se(IV) as low as 0.25 nM (0.02 μg L −1) at deposition time (120 s) could be obtained. For seven successive determinations of Se(IV) at concentration of 5 nM...

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Bibliographic Details
Published in:Electrochimica acta 2007-12, Vol.53 (2), p.584-589
Main Authors: Piech, Robert, Kubiak, Władysław W.
Format: Article
Language:English
Subjects:
Analytical chemistry
Cathodic stripping voltammetry
Chemistry
Copper amalgam preparation
Electrochemical methods
Exact sciences and technology
Hanging copper amalgam drop electrode
Selenium
Trace analysis
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Summary:Hanging copper amalgam drop electrode has been applied for trace determination of selenium by cathodic stripping analysis. Detection limit for Se(IV) as low as 0.25 nM (0.02 μg L −1) at deposition time (120 s) could be obtained. For seven successive determinations of Se(IV) at concentration of 5 nM relative standard deviation was 2.3% ( n = 7). Interferences from selected metals and surfactant substances were examined. Absence of copper ions in sample solution causes easier optimization and makes method less vulnerable on contamination. The developed method was validated by analysis of certified reference materials (BCRs) and applied to selenium determinations in natural water samples, snow, mushrooms and ox liver.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2007.07.017