Electroanalysis of Trace Inorganic Arsenic with Gold Nanoelectrode Ensembles

The results of a study on the determination of trace levels of arsenic with nanoelectrode ensembles (NEEs) are reported. In order to lower the detection limit and to increase the number of performable analysis for each NEE, the right choice of the supporting electrolyte concentration and electroanal...

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Bibliographic Details
Published in:Electroanalysis (New York, N.Y.) N.Y.), 2012-04, Vol.24 (4), p.798-806
Main Authors: Mardegan, A., Scopece, P., Lamberti, F., Meneghetti, M., Moretto, L. M., Ugo, P.
Format: Article
Language:English
Subjects:
Anodic stripping
Anodic stripping voltammetry
Arsenic
Electrolytes
Electrolytic analysis
Nanocomposites
Nanoelectrode ensemble
Nanomaterials
Nanostructure
Voltammetry
Water analysis
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Summary:The results of a study on the determination of trace levels of arsenic with nanoelectrode ensembles (NEEs) are reported. In order to lower the detection limit and to increase the number of performable analysis for each NEE, the right choice of the supporting electrolyte concentration and electroanalytical parameters were optimized. The electrochemical behavior of As(III) at NEEs was studied at first by cyclic voltammetry, while trace concentrations of As(III) were determined by anodic stripping square wave voltammetry. The method is characterized by a detection limit as low as 5 ng/L (65 pM) after 3 min preconcentration at −0.4 V. Finally, NEEs were applied to trace As analysis in real samples such as certified seawater samples.
ISSN:1040-0397
1521-4109
DOI:10.1002/elan.201100555