Electrochemical determination of arsenic in natural waters using carbon fiber ultra-microelectrodes modified with gold nanoparticles

Patricio Carrera, Patricio J. Espinoza-Montero, Lenys Fernández, Hugo Romero, José Alvarado

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

71 Citas (Scopus)

Resumen

We have developed an anodic stripping voltammetry method that employs carbon fiber ultra-microelectrodes modified with gold nanoparticles to determine arsenic in natural waters. Gold nanoparticles were potentiostatically deposited on carbon fiber ultra-microelectrodes at −0.90 V (vs SCE) for a time of 15 s, to form the carbon fiber ultra-microelectrodes modified with gold nanoparticles. Cyclic voltammetry, electrochemical impedance spectroscopy and scanning electron microscopy coupled to an X-ray microanalysis system were used to check and confirm the presence of gold nanoparticles on the carbon fiber ultra-microelectrodes. Arsenic detection parameters such as deposition potential and deposition time were optimized allowing a detection range between 5 to 60 µg L-1. The developed modified electrodes allowed rapid As determination with improved analytical characteristics including better repeatability, higher selectivity, lower detection limit (0.9 μg L-1) and higher sensitivity (0.0176 nA μg L-1) as compared to the standard carbon electrodes. The analytical capability of the optimized method was demonstrated by determination of arsenic in certified reference materials (trace elements in water (NIST SRM 1643d)) and by comparison of results with those obtained by hydride generation atomic absorption spectrometry (HG-AAS) in the determination of the analyte in tap and well waters.

Idioma originalInglés
Páginas (desde-hasta)198-206
Número de páginas9
PublicaciónTalanta
Volumen166
DOI
EstadoPublicada - 1 may. 2017
Publicado de forma externa

Nota bibliográfica

Publisher Copyright:
© 2017 Elsevier B.V.

Huella

Profundice en los temas de investigación de 'Electrochemical determination of arsenic in natural waters using carbon fiber ultra-microelectrodes modified with gold nanoparticles'. En conjunto forman una huella única.

Citar esto