Electrochemical sensors have been developed for the determination of selenium (Se (IV)) using glassy car-bon electrodes modified with gold nanoparticles (AuNPs) obtained electrochemically (GC/AuNPs/E) andchemically (GC/AuNPs/C) using square wave anodic stripping voltammetry (SWASV). GC/AuNPs/E wascharacterized by cyclic voltammetry (CV), atomic force microscopy (AFM), scanning electron microscopy(SEM), and X-ray dispersion spectrometry (EDS). The results indicate a homogeneous distribution ofAuNPs with a 75 ± 20 nm particle size distribution. The chemically prepared AuNPs were characterizedby transmission electron microscopy (TEM) and UV–vis spectroscopy (Surface Plasmon Band), and theresults indicate that the AuNPs have a spherical shape (7.4 ± 1.3 nm).
GC/AuNPs/C was prepared usinga drop coating technique and was characterized by CV.
The optimum conditions for the prepared elec-trodes were as follows: accumulation potential of −0.80 V (Eacc), accumulation time (tacc) of 120 s, anda frequency of 15 Hz. A linear range was observed from 10 to 50 g L−1with a limit of detection (LOD)of 0.120 g L−1for GC/AuNPs/E, and a linear range was observed from 15 to 55 g L−1with a LOD of0.175 g L−1for GC/AuNPs/C.
The proposed procedure was validated with the TM-15 certified referencematerial, and good accuracy and precision were observed. In addition, this approach was applied toseawater samples with satisfactory results.
Electrochemical sensors have been developed for the determination of selenium (Se (IV)) using glassy car-bon electrodes modified with gold nanoparticles (AuNPs) obtained electrochemically (GC/AuNPs/E) andchemically (GC/AuNPs/C) using square wave anodic stripping voltammetry (SWASV). GC/AuNPs/E wascharacterized by cyclic voltammetry (CV), atomic force microscopy (AFM), scanning electron microscopy(SEM), and X-ray dispersion spectrometry (EDS). The results indicate a homogeneous distribution ofAuNPs with a 75 ± 20 nm particle size distribution. The chemically prepared AuNPs were characterizedby transmission electron microscopy (TEM) and UV–vis spectroscopy (Surface Plasmon Band), and theresults indicate that the AuNPs have a spherical shape (7.4 ± 1.3 nm). GC/AuNPs/C was prepared usinga drop coating technique and was characterized by CV. The optimum conditions for the prepared elec-trodes were as follows: accumulation potential of −0.80 V (Eacc), accumulation time (tacc) of 120 s, anda frequency of 15 Hz. A linear range was observed from 10 to 50 g L−1with a limit of detection (LOD)of 0.120 g L−1for GC/AuNPs/E, and a linear range was observed from 15 to 55 g L−1with a LOD of0.175 g L−1for GC/AuNPs/C. The proposed procedure was validated with the TM-15 certified referencematerial, and good accuracy and precision were observed. In addition, this approach was applied toseawater samples with satisfactory results.
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