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

作者：Segura Rodrigo^*; Pizarro Jaime; Diaz Karina; Placencio Alan; Godoy Fernando; Pino Eduardo; Recio Francisco

来源：Sensors and Actuators B: Chemical , 2015, 220: 263-269.

DOI：10.1016/j.snb.2015.05.016

• Gold nanoparticles
• Anodic stripping voltammetry
• Selenium
• Chemically 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 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 0.80V (E-acc), accumulation time (t(acc)) of 120s, and a frequency of 15 Hz. A linear range was observed from 10 to 50 mu g L-1 with a limit of detection (LOD) of 0.120 mu g L-1 for GC/AuNPs/E, and a linear range was observed from 15 to 55 mu g L-1 with a LOD of 0.175 mu g 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.

• 出版日期2015-12-1