Author(s):
Cárdenas Riojas, Andy A. ; Wong, Ademar [UNESP] ; Planes, Gabriel A. ; Sotomayor, Maria D.P.T. [UNESP] ; La Rosa-Toro, Adolfo ; Baena-Moncada, Angélica M.
Date: 2019
Persistent ID: http://hdl.handle.net/11449/188763
Origin: Oasisbr
Subject(s): Electrochemical sensor; Hierarchical porous carbon; Silver sulfide nanoparticles; Water river samples and cyanide; Electrochemical sensor; Electrochemical sensor; Hierarchical porous carbon; Hierarchical porous carbon; Silver sulfide nanoparticles; Silver sulfide nanoparticles; Water river samples and cyanide; Water river samples and cyanide
Description
Made available in DSpace on 2019-10-06T16:18:28Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-05-15
In this study, a new electrochemical sensor for determination of cyanide is proposed. The sensor is formed by a carbon paste electrode modified with hierarchical porous carbon and silver sulfide nanoparticles. The morphology characterization was performed by transmission electron microscopy (TEM) and scanning electron microscopy (SEM), while the chemical and electrochemistry characterization were performed by energy dispersive X-ray spectroscopy and cyclic voltammetry, respectively. Under the optimized conditions, the Ag2SNPs-HPC300 sensor presented a large concentration linear range of 5.9 × 10−7 to 1.1 × 10-3 mol L-1, and limit of detection of 7.0 × 10-8 mol L-1 using square-wave adsorptive anodic stripping voltammetry (SWAdASV) technique. The analytical response of the Ag2SNPs-HPC300 sensor was evaluated in presence of different compounds, and the results showed a RSD of 4.3% in triplicate experiments. The applicability of the Ag2SNPs-HPC300 sensor in river water samples contaminated with cyanine showed recoveries values near 100%. The developed method exhibited high sensitivity and selectivity, good reproducibility, repeatability and low-cost, demonstrating to be a very promising analytical alternative for determination of cyanide in this matrix.
Laboratorio de Investigación de Electroquímica Aplicada Facultad de Ciencias de la Universidad Nacional de Ingeniería, Av. Tupac Amaru 210
Department of Analytical Chemistry Institute of Chemistry State University of São Paulo (UNESP)
Universidad Nacional de Río Cuarto, Ruta Nac. 36, Km 601 (X5804BYA), Río Cuarto
National Institute for Alternative Technologies of Detection Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT-DATREM)
Department of Analytical Chemistry Institute of Chemistry State University of São Paulo (UNESP)
