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- W607658810 abstract "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 ± 20 nm 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 ± 1.3 nm). 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 −0.80 V (Eacc), accumulation time (tacc) of 120 s, and a frequency of 15 Hz. A linear range was observed from 10 to 50 μg L−1 with a limit of detection (LOD) of 0.120 μg L−1 for GC/AuNPs/E, and a linear range was observed from 15 to 55 μg L−1 with a LOD of 0.175 μg L−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." @default.
- W607658810 created "2016-06-24" @default.
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- W607658810 date "2015-12-01" @default.
- W607658810 modified "2023-10-02" @default.
- W607658810 title "Development of electrochemical sensors for the determination of selenium using gold nanoparticles modified electrodes" @default.
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- W607658810 doi "https://doi.org/10.1016/j.snb.2015.05.016" @default.
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