Trace determination of mercury by anodic stripping voltammetry at the rotating gold electrode

A simple and highly reliable method for the determination of mercury on a rotating gold disk electrode is reported. The signal is linear with concentration over a wide concentration range (0.2–400nM). The stability of the electrode is excellent. No mechanical polishing between runs is required and a...

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Bibliographic Details
Published in:Analytica chimica acta 2000-11, Vol.424 (1), p.65-76
Main Authors: Bonfil, Y, Brand, M, Kirowa-Eisner, E
Format: Article
Language:English
Subjects:
Analytical chemistry
Anodic stripping voltammetry
Chemistry
Electrochemical methods
Exact sciences and technology
Mercury
Rotating gold electrode
Urine
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Summary:A simple and highly reliable method for the determination of mercury on a rotating gold disk electrode is reported. The signal is linear with concentration over a wide concentration range (0.2–400nM). The stability of the electrode is excellent. No mechanical polishing between runs is required and a simple electrochemical pretreatment is applied about once in 100runs. The detection limit in synthetic solutions, applying the subtractive mode of anodic stripping voltammetry (SASV) is 50pM for a 120s deposition time at 5000rpm and 4nM in urine sample for 180s deposition time. The reproducibility of the analytical signal is better than 2% in solutions containing 1nMHg(II). The applicability of the method in urine analysis was demonstrated with the use of certified samples. No interference by lead, copper, cadmium, chromium or selenium was found at concentrations corresponding to their toxic occurrence in urine.
ISSN:0003-2670
1873-4324
DOI:10.1016/S0003-2670(00)01074-6