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Nanoporous Gold Microelectrode: A Novel Sensing Platform for Highly Sensitive and Selective Determination of Arsenic (III) using Anodic Stripping Voltammetry
Author(s) -
Jaramillo Darío Xavier Orellana,
Sukeri Anandhakumar,
Saravia Lucas P.H.,
EspinozaMontero Patricio Javier,
Bertotti Mauro
Publication year - 2017
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.201700301
Subject(s) - nanoporous , microelectrode , detection limit , materials science , analytical chemistry (journal) , cyclic voltammetry , voltammetry , anodic stripping voltammetry , electrochemistry , repeatability , anodizing , reproducibility , electrode , nanotechnology , chemistry , chromatography , aluminium , metallurgy
Abstract 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.