Nanoporous Gold Microelectrode: A Novel Sensing Platform for Highly Sensitive and Selective Determination of Arsenic (III) using Anodic Stripping Voltammetry

Darío Xavier Orellana Jaramillo, Anandhakumar Sukeri, Lucas P.H. Saravia, Patricio Javier Espinoza-Montero, Mauro Bertotti

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

28 Citas (Scopus)

Resumen

A home-made gold microelectrode (Au-μE) was fabricated and its surface was modified with nanoporous gold structures via a facile electrochemical approach (anodization followed by electrochemical reduction method). The fabricated nanoporous Au microelectrode (NPG-μE) was used as a sensor probe for the determination of As(III) in 1.0 mol L−1 HCl solution using square wave anodic stripping voltammetry (SWASV) technique. Field emission scanning electron microscopy (FE-SEM) and cyclic voltammetry were used to characterize the surface morphology and assess the electrochemical surface area and the roughness factor of the NPG-μE. SWASVs recorded with the NPG-μE in As(III) solutions indicated linear behaviour in the concentration ranges of 10–200 μg L−1 and 2–30 μg L−1, with regression coefficients of 0.996 and 0.999 at a deposition time of 120 s, respectively. The limit of detection (LOD) was found to be 0.62 μg L−1 with high sensitivity of 29.75 μA (μg L−1)−1 cm−2. Repeatability and reproducibility were also examined and values were determined as 3.2 % and 9.0 %. Negligible interference from major interfering copper ion was noticed, revealing the excellent anti-interference property of the proposed sensing platform. The developed NPG-μE was successfully used for As(III) determination in tap water samples.

Idioma originalInglés
Páginas (desde-hasta)2316-2322
Número de páginas7
PublicaciónElectroanalysis
Volumen29
N.º10
DOI
EstadoPublicada - oct. 2017
Publicado de forma externa

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Publisher Copyright:
© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

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