Gold Nanoelectrode Ensembles for the Simultaneous Electrochemical Detection of Ultratrace Arsenic, Mercury, and Copper
- 30 April 2008
- journal article
- research article
- Published by American Chemical Society (ACS) in Analytical Chemistry
- Vol. 80 (13), 4836-4844
- https://doi.org/10.1021/ac071064w
Abstract
Simultaneous electrochemical detection of As(III), Hg(II), and Cu(II) using a highly sensitive platform based on gold nanoelectrode ensembles (GNEEs) is described. GNEEs were grown by colloidal chemical approach on thiol-functionalized sol—gel derived three-dimensional silicate network preassembled on a polycrystalline gold (Au) electrode. GNEEs on the silicate network have been characterized by field emission scanning electron microscopy, X-ray diffraction, diffuse reflectance spectroscopy, and electrochemical measurements. Square wave anodic stripping voltammetry (SWASV) has been used for the detection of As(III) and Hg(II) without any interference from Cu(II) at the potentials of 0.06 and 0.53 V, respectively. The GNEE electrode is highly sensitive, and it shows linear response for As(III) and Hg(II) up to 15 ppb. The detection limit (signal-to-noise ratio = 4) of the GNEE electrode toward As(III) and Hg(II) is 0.02 ppb, which is well below the guideline value given by the World Health Organization (WHO). The potential application of the GNEE electrode for the detection of As(III) in a real sample collected from the arsenic-contaminated water in 24 North Parganas, West Bengal is demonstrated. The GNEE electrode has been successfully used for the simultaneous detection of As(III), Cu(II), and Hg(II) at sub-part-per-billion level without any interference for the first time. The nanostructured electrode shows individual voltammetric peaks for As(III), Cu(II), and Hg(II) at 0.06, 0.35, and 0.53 V, respectively. The analytical performance of the GNEE electrode is superior to the existing electrodes.Keywords
This publication has 69 references indexed in Scilit:
- Electrochemical Determination of Arsenite Using a Gold Nanoparticle Modified Glassy Carbon Electrode and Flow AnalysisAnalytical Chemistry, 2005
- Analytical methods for inorganic arsenic in water: a reviewTalanta, 2004
- Analysis and Speciation of Traces of Arsenic in Environmental, Food and Industrial Samples by Voltammetry: a ReviewElectroanalysis, 2004
- Arsenic calamity in the Indian subcontinent What lessons have been learned?Talanta, 2002
- Arsenic round the world: a reviewTalanta, 2002
- Chronic Arsenic Toxicity in Bangladesh and West Bengal, India—A Review and CommentaryJournal of Toxicology: Clinical Toxicology, 2001
- Groundwater arsenic contamination in Bangladesh and West Bengal, India.Environmental Health Perspectives, 2000
- THE CHEMICAL CYCLE AND BIOACCUMULATION OF MERCURYAnnual Review of Ecology and Systematics, 1998
- Determination of arsenic species in biological and environmental samples (Technical Report)Published by Walter de Gruyter GmbH ,1992
- Arsenic speciation in the environmentChemical Reviews, 1989