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Electroanalysis of Trace Inorganic Arsenic with Gold Nanoelectrode Ensembles
Author(s) -
Mardegan A.,
Scopece P.,
Lamberti F.,
Meneghetti M.,
Moretto L. M.,
Ugo P.
Publication year - 2012
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201100555
Subject(s) - detection limit , arsenic , trace (psycholinguistics) , anodic stripping voltammetry , chemistry , voltammetry , supporting electrolyte , cyclic voltammetry , analytical chemistry (journal) , electroanalytical method , trace amounts , electrochemistry , environmental chemistry , chromatography , electrode , medicine , philosophy , linguistics , alternative medicine , organic chemistry , pathology , potentiometric titration
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.