Development of electrochemical sensors for the determination of selenium using gold nanoparticles modified electrodes

Electrochemical sensors have been developed for the determination of selenium (Se (IV)) using glassy carbon electrodes modified with gold nanoparticles (AuNPs) obtained electrochemically (GC/AuNPs/E) and chemically (GC/AuNPs/C) using square wave anodic stripping voltammetry (SWASV). GC/AuNPs/E was c...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2015-12, Vol.220, p.263-269
Main Authors: Segura, Rodrigo, Pizarro, Jaime, Díaz, Karina, Placencio, Alan, Godoy, Fernando, Pino, Eduardo, Recio, Francisco
Format: Article
Language:English
Subjects:
Anodic stripping voltammetry
Atomic force microscopy
Chemically modified electrodes
Electrodes
Gold
Gold nanoparticles
Scanning electron microscopy
Selenium
Sensors
Spectroscopy
Voltammetry
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Summary:Electrochemical sensors have been developed for the determination of selenium (Se (IV)) using glassy carbon electrodes modified with gold nanoparticles (AuNPs) obtained electrochemically (GC/AuNPs/E) and chemically (GC/AuNPs/C) using square wave anodic stripping voltammetry (SWASV). GC/AuNPs/E was characterized by cyclic voltammetry (CV), atomic force microscopy (AFM), scanning electron microscopy (SEM), and X-ray dispersion spectrometry (EDS). The results indicate a homogeneous distribution of AuNPs with a 75±20nm particle size distribution. The chemically prepared AuNPs were characterized by transmission electron microscopy (TEM) and UV–vis spectroscopy (Surface Plasmon Band), and the results indicate that the AuNPs have a spherical shape (7.4±1.3nm). GC/AuNPs/C was prepared using a drop coating technique and was characterized by CV. The optimum conditions for the prepared electrodes were as follows: accumulation potential of −0.80V (Eacc), accumulation time (tacc) of 120s, and a frequency of 15Hz. A linear range was observed from 10 to 50μgL−1 with a limit of detection (LOD) of 0.120μgL−1 for GC/AuNPs/E, and a linear range was observed from 15 to 55μgL−1 with a LOD of 0.175μgL−1 for GC/AuNPs/C. The proposed procedure was validated with the TM-15 certified reference material, and good accuracy and precision were observed. In addition, this approach was applied to seawater samples with satisfactory results.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2015.05.016